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feat(python): Allow to read and write custom file-level parquet metadata by borchero · Pull Request #21806 · pola-rs/polars · GitHub
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1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" 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12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 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Link--secondary" data-analytics-event="{"location":"navbar","action":"view_all_industries","context":"solutions","tag":"link","label":"view_all_industries_link_solutions_navbar"}" href="/solutions/industry"> View all industries </a></li> </ul> </div> </div> <div class="HeaderMenu-trailing-link rounded-bottom-2 flex-shrink-0 mt-lg-4 px-lg-4 py-4 py-lg-3 f5 text-semibold"> <a href="/solutions"> View all solutions <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-right HeaderMenu-trailing-link-icon"> <path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path> </svg> </a> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Resources <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="resources-topics-heading">Topics</span> <ul 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data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"executive_insights","context":"resources","tag":"link","label":"executive_insights_link_resources_navbar"}" href="https://github.com/solutions/executive-insights"> Executive Insights </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Open Source <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> Fund open source developers </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"the_readme_project","context":"open_source","tag":"link","label":"the_readme_project_link_open_source_navbar"}" href="https://github.com/readme"> <div> <div class="color-fg-default h4">The ReadME Project</div> GitHub community articles </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="open-source-repositories-heading">Repositories</span> <ul class="list-style-none f5" aria-labelledby="open-source-repositories-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"topics","context":"open_source","tag":"link","label":"topics_link_open_source_navbar"}" href="https://github.com/topics"> Topics </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"trending","context":"open_source","tag":"link","label":"trending_link_open_source_navbar"}" href="https://github.com/trending"> Trending </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" 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id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="code-search-feedback-form" data-action="click:qbsearch-input#submitFeedback" type="submit" data-view-component="true" class="btn-primary btn"> Submit feedback </button> </div> </dialog></dialog-helper> <custom-scopes data-target="qbsearch-input.customScopesManager"> <dialog-helper> <dialog data-target="custom-scopes.customScopesModalDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="custom-scopes-dialog" 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6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="r0bfo8ax5LLiunCrRb+vs7UPP+ziXISJ55O96SJj0YLoDlNIcM6dPoofJ+w2qe14aQpQ34KNrSZ/Js9uaUVo8w==" /> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <input type="hidden" 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</div><div class= "timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0" id="issue-2926824625"> <div id="pullrequest-2399453368" class="timeline-comment-group js-minimizable-comment-group js-targetable-element my-0 comment previewable-edit js-task-list-container js-comment editable-comment timeline-comment--caret reorderable-task-lists timeline-comment ml-n3 unminimized-comment"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon 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src="https://avatars.githubusercontent.com/u/22455425?s=48&v=4" alt="@borchero" size="24" height="24" width="24" data-view-component="true" class="avatar circle d-inline-block d-md-none mr-2" /> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero">borchero</a> </strong> commented <a href="#issue-2926824625" id="issue-2926824625-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-18T01:43:59Z" class="no-wrap">Mar 18, 2025</relative-time></a> </div> </h3> </div> <div> <div class="edit-comment-hide"> <task-lists disabled sortable> <div class="comment-body markdown-body js-comment-body soft-wrap css-overflow-wrap-anywhere user-select-contain d-block"> <h1 dir="auto">Motivation</h1> <p dir="auto"><span class="issue-keyword tooltipped tooltipped-se" aria-label="This pull request closes issue #18550.">Resolves</span> <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="2505475161" data-permission-text="Title is private" data-url="https://github.com/pola-rs/polars/issues/18550" data-hovercard-type="issue" data-hovercard-url="/pola-rs/polars/issues/18550/hovercard" href="https://github.com/pola-rs/polars/issues/18550">#18550</a>.</p> <p dir="auto">The key use case for me would be to attach additional schema-information, such as the (composite) primary key of the data frame without the need to resort to something more complex than a parquet file.</p> <h1 dir="auto">Changes</h1> <p dir="auto">This PR extends the current API as follows:</p> <ul dir="auto"> <li><code class="notranslate">write_parquet</code> receives a <code class="notranslate">metadata: dict[str, str] | None = None</code> parameter to optionally set custom metadata</li> <li>A new top-level function <code class="notranslate">read_parquet_metadata</code> (analogous to <code class="notranslate">read_parquet_schema</code>) is added to retrieve the metadata set in <code class="notranslate">write_parquet</code></li> </ul> <p dir="auto">This PR does <strong>not</strong> implement the <code class="notranslate">metadata</code> argument for <code class="notranslate">sink_parquet</code> since this involves a couple more changes. I don't think there's a strong reason that this needs to happen in the same PR though.</p> </div> </task-lists> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issue-2926824625-edit-form" data-type="json" data-turbo="false" action="/pola-rs/polars/issues/21806" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="vqMM2SMljx0e6hH9dqnex5CkGZRf3QF39_JCfly4TFt6xjA82FsSma5pCoaKZV-BrNnVnu0rxjzpbTs5JzL9xg" autocomplete="off" /> <include-fragment loading="lazy" src="/pola-rs/polars/issues/21806/edit_form?textarea_id=issue-2926824625-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; color: var(--color-icon-primary);" width="32" height="32" 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9h3.25a.75.75 0 0 1 0 1.5H3.5a1 1 0 0 0 0 2h5.75a.75.75 0 0 1 0 1.5H3.5A2.5 2.5 0 0 1 1 11.5Zm13.23 7.79h-.001l-1.224-1.224v6.184a.75.75 0 0 1-1.5 0V9.066L10.28 10.29a.75.75 0 0 1-1.06-1.061l2.505-2.504a.75.75 0 0 1 1.06 0L15.29 9.23a.751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018Z"></path> </svg></div> <div data-view-component="true" class="TimelineItem-body"> <a class="author Link--primary text-bold" data-test-selector="pr-timeline-events-commit-actor-profile-link" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero">borchero</a> added <span >2</span> commits <a href="#commits-pushed-815bb30" data-view-component="true" class="Link--inTextBlock Link--secondary Link"><relative-time tense="past" datetime="2025-03-18T02:54:34+01:00" data-view-component="true">March 18, 2025 02:54</relative-time></a></div> </div> <div > <div data-view-component="true" class="TimelineItem 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<img data-test-selector="commits-avatar-stack-avatar-image" src="https://avatars.githubusercontent.com/u/22455425?s=40&v=4" width="20" height="20" alt="@borchero" class=" avatar-user" /> </a> </div> </div> <div class="pr-1 flex-auto min-width-0" > <code> <a title="Update" data-pjax="true" class="Link--secondary markdown-title" href="/pola-rs/polars/pull/21806/commits/815bb30d20ab414e9c35bcdc9382209a3a8192b6">Update</a> </code> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content class="d-inline-block" data-url="/commits/badges"> <input type="hidden" name="id" value="C_kwDOJ1jhktoAKDgxNWJiMzBkMjBhYjQxNGU5YzM1YmNkYzkzODIyMDlhM2E4MTkyYjY" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="badge_size" value="small" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="dropdown_direction" value="s" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <span class="Skeleton 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js-socket-channel js-updatable-content"> <div class="d-flex flex-md-row flex-column"> <div class="d-flex flex-auto"> <div class="AvatarStack flex-self-start " > <div class="AvatarStack-body" > <a class="avatar avatar-user" style="width:20px;height:20px;" data-test-selector="commits-avatar-stack-avatar-link" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"> <img data-test-selector="commits-avatar-stack-avatar-image" src="https://avatars.githubusercontent.com/u/22455425?s=40&v=4" width="20" height="20" alt="@borchero" class=" avatar-user" /> </a> </div> </div> <div class="pr-1 flex-auto min-width-0" > <code> <a title="Simplify" data-pjax="true" class="Link--secondary markdown-title" href="/pola-rs/polars/pull/21806/commits/e88556f3fff2994744d0ac3eea71b04d10a977f6">Simplify</a> </code> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content 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</div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="IC_kwDOD7gq786i28tL"> <div class="TimelineItem js-comment-container" data-gid="IC_kwDOD7gq786i28tL" data-url="/pola-rs/polars/comments/IC_kwDOD7gq786i28tL/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" href="/apps/codecov"><img class="avatar rounded-2" src="https://avatars.githubusercontent.com/in/254?s=80&v=4" width="40" height="40" alt="@codecov" /></a> <a href="https://github.com/apps/codecov"> <img src="https://avatars.githubusercontent.com/in/254?s=40&u=c392dd7c2afc51fe2347d4296afa8494ac05772e&v=4" alt="Codecov" width="20" height="20" class="avatar avatar-child rounded-2"> </a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-2732313419"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="9f54b78ac56b19e1ec494802a638a9e4825201ea1e1700f584466ed55417f4a9"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" 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class="details-overlay details-reset d-inline-block dropdown hx_dropdown-fullscreen"> <summary class="btn-link no-underline color-fg-muted js-notice"> <div class="position-relative"> <span> edited </span> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-triangle-down v-align-middle"> <path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path> </svg> </div> </summary> <details-menu class="dropdown-menu dropdown-menu-s width-auto py-0 js-comment-edit-history-menu" style="max-width: 352px; z-index: 99;" src="/user_content_edits/show_edit_history_log/IC_kwDOD7gq786i28tL" preload > <include-fragment class="my-3" style="min-width: 100px;" aria-label="Loading..."> <span data-view-component="true"> <svg style="box-sizing: content-box; color: var(--color-icon-primary);" width="32" height="32" viewBox="0 0 16 16" fill="none" aria-hidden="true" data-view-component="true" class="mx-auto d-block anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" fill="none" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg> <span class="sr-only">Loading</span> </span> </include-fragment> </details-menu> </details> </span> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <h2 dir="auto"><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?dropdown=coverage&src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">Codecov</a> Report</h2> <p dir="auto">Attention: Patch coverage is <code class="notranslate">74.36975%</code> with <code class="notranslate">61 lines</code> in your changes missing coverage. Please review.</p> <blockquote> <p dir="auto">Project coverage is 80.91%. Comparing base <a href="https://app.codecov.io/gh/pola-rs/polars/commit/0e6769ccf89c8b4e62d4dbad380ab8b4e39ee754?dropdown=coverage&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">(<code class="notranslate">0e6769c</code>)</a> to head <a href="https://app.codecov.io/gh/pola-rs/polars/commit/c20f7eb031429332f05e4dc3bac5c558819d96c5?dropdown=coverage&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">(<code class="notranslate">c20f7eb</code>)</a>.<br> Report is 3 commits behind head on main.</p> </blockquote> <markdown-accessiblity-table><table role="table"> <thead> <tr> <th><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">Files with missing lines</a></th> <th>Patch %</th> <th>Lines</th> </tr> </thead> <tbody> <tr> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&filepath=crates%2Fpolars-io%2Fsrc%2Fparquet%2Fwrite%2Fkey_value_metadata.rs&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs#diff-Y3JhdGVzL3BvbGFycy1pby9zcmMvcGFycXVldC93cml0ZS9rZXlfdmFsdWVfbWV0YWRhdGEucnM=" rel="nofollow">.../polars-io/src/parquet/write/key_value_metadata.rs</a></td> <td>51.37%</td> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">53 Missing <g-emoji class="g-emoji" alias="warning">⚠️</g-emoji> </a></td> </tr> <tr> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&filepath=py-polars%2Fpolars%2Fdataframe%2Fframe.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs#diff-cHktcG9sYXJzL3BvbGFycy9kYXRhZnJhbWUvZnJhbWUucHk=" rel="nofollow">py-polars/polars/dataframe/frame.py</a></td> <td>71.42%</td> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">1 Missing and 1 partial <g-emoji class="g-emoji" alias="warning">⚠️</g-emoji> </a></td> </tr> <tr> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&filepath=py-polars%2Fpolars%2Flazyframe%2Fframe.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs#diff-cHktcG9sYXJzL3BvbGFycy9sYXp5ZnJhbWUvZnJhbWUucHk=" rel="nofollow">py-polars/polars/lazyframe/frame.py</a></td> <td>71.42%</td> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">1 Missing and 1 partial <g-emoji class="g-emoji" alias="warning">⚠️</g-emoji> </a></td> </tr> <tr> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&filepath=crates%2Fpolars-io%2Fsrc%2Fpartition.rs&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs#diff-Y3JhdGVzL3BvbGFycy1pby9zcmMvcGFydGl0aW9uLnJz" rel="nofollow">crates/polars-io/src/partition.rs</a></td> <td>92.30%</td> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">1 Missing <g-emoji class="g-emoji" alias="warning">⚠️</g-emoji> </a></td> </tr> <tr> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&filepath=crates%2Fpolars-pipe%2Fsrc%2Fpipeline%2Fconvert.rs&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs#diff-Y3JhdGVzL3BvbGFycy1waXBlL3NyYy9waXBlbGluZS9jb252ZXJ0LnJz" rel="nofollow">crates/polars-pipe/src/pipeline/convert.rs</a></td> <td>0.00%</td> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">1 Missing <g-emoji class="g-emoji" alias="warning">⚠️</g-emoji> </a></td> </tr> <tr> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&filepath=crates%2Fpolars-python%2Fsrc%2Ffunctions%2Fio.rs&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs#diff-Y3JhdGVzL3BvbGFycy1weXRob24vc3JjL2Z1bmN0aW9ucy9pby5ycw==" rel="nofollow">crates/polars-python/src/functions/io.rs</a></td> <td>91.66%</td> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">1 Missing <g-emoji class="g-emoji" alias="warning">⚠️</g-emoji> </a></td> </tr> <tr> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&filepath=py-polars%2Fpolars%2Fio%2Fparquet%2Ffunctions.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs#diff-cHktcG9sYXJzL3BvbGFycy9pby9wYXJxdWV0L2Z1bmN0aW9ucy5weQ==" rel="nofollow">py-polars/polars/io/parquet/functions.py</a></td> <td>80.00%</td> <td><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">0 Missing and 1 partial <g-emoji class="g-emoji" alias="warning">⚠️</g-emoji> </a></td> </tr> </tbody> </table></markdown-accessiblity-table> <details><summary>Additional details and impacted files</summary> <div class="highlight highlight-source-diff notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="@@ Coverage Diff @@ ## main #21806 +/- ## ========================================== - Coverage 80.97% 80.91% -0.06% ========================================== Files 1622 1626 +4 Lines 234054 234857 +803 Branches 2693 2700 +7 ========================================== + Hits 189530 190041 +511 - Misses 43892 44181 +289 - Partials 632 635 +3 "><pre class="notranslate"><span class="pl-mdr">@@ Coverage Diff @@</span> <span class="pl-c"><span class="pl-c">#</span># main #21806 +/- ##</span> ========================================== <span class="pl-md"><span class="pl-md">-</span> Coverage 80.97% 80.91% -0.06% </span> ========================================== Files 1622 1626 +4 Lines 234054 234857 +803 Branches 2693 2700 +7 ========================================== <span class="pl-mi1"><span class="pl-mi1">+</span> Hits 189530 190041 +511 </span> <span class="pl-md"><span class="pl-md">-</span> Misses 43892 44181 +289 </span> <span class="pl-md"><span class="pl-md">-</span> Partials 632 635 +3 </span></pre></div> </details> <p dir="auto"><a href="https://app.codecov.io/gh/pola-rs/polars/pull/21806?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">☔ View full report in Codecov by Sentry</a>.<br> 📢 Have feedback on the report? <a href="https://about.codecov.io/codecov-pr-comment-feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pola-rs" rel="nofollow">Share it here</a>.</p> <details><summary> 🚀 New features to boost your workflow: </summary> <ul dir="auto"> <li>❄️ <a href="https://docs.codecov.com/docs/test-analytics" 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class="Label ml-1">Collaborator</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/coastalwhite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/coastalwhite">coastalwhite</a> </strong> commented <a href="#issuecomment-2732329414" id="issuecomment-2732329414-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-18T09:39:12Z" class="no-wrap">Mar 18, 2025</relative-time></a> <span class="js-comment-edit-history"> <span class="d-inline-block color-fg-muted">•</span> <details class="details-overlay details-reset d-inline-block dropdown hx_dropdown-fullscreen"> <summary class="btn-link no-underline color-fg-muted js-notice"> <div class="position-relative"> <span> edited </span> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" 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stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg> <span class="sr-only">Loading</span> </span> </include-fragment> </details-menu> </details> </span> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">I really do want to support something like this, but I am pretty sure it will need to be a callback, not a static dictionary. In general, since this is being added as a stable API, a bit of thought needs to go into how this will operate.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="gvJeCDMJ2UzrxG7uiukJ5RmmxU-Fn7VGR-klNnYZNB-PvH8PgGEIp-MNdPttZ5Q3SUWkzpVL-up-CfRB6m0mGw" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786i3AnG"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2732329414-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2732329414" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="ScV+RRYPqDpBNnOGTjll6/tbkxrxD6mgtGJEpppwR3fEqHDSptmBkPNFeekNHsU0s6/X2Sn5jOIMOqHR8iWFyg==" /> <include-fragment loading="lazy" src="/pola-rs/polars/issue_comments/2732329414/edit_form?textarea_id=issuecomment-2732329414-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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Why do you think this needs to be a callback, i.e. what use case do you want to cover with that? What would be the input to that callback?</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="hspXfY2eipcr-GfJdtrSJOb25-DTv8Qw7Sl0FOsuu6-LhHZ6PvZbfCMxfdyRVE_2thWGYcNri5zUyaVjd1qpqw" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786i3yhw"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2732533872-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2732533872" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="IGIUK+AoGxcq1Kq08c86MKtE8Ck8kXWnXqvWBPup57W3/OFT3FtAsRlj7JfLeGnU9kqEnpmgYaYiEM34zc8G0w==" /> <include-fragment loading="lazy" src="/pola-rs/polars/issue_comments/2732533872/edit_form?textarea_id=issuecomment-2732533872-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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z-index: 99;" src="/user_content_edits/show_edit_history_log/IC_kwDOD7gq786i31oT" preload > <include-fragment class="my-3" style="min-width: 100px;" aria-label="Loading..."> <span data-view-component="true"> <svg style="box-sizing: content-box; color: var(--color-icon-primary);" width="32" height="32" viewBox="0 0 16 16" fill="none" aria-hidden="true" data-view-component="true" class="mx-auto d-block anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" fill="none" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg> <span class="sr-only">Loading</span> </span> </include-fragment> </details-menu> </details> </span> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <blockquote> <p dir="auto">Thanks for giving this some thought <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/coastalwhite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/coastalwhite">@coastalwhite</a>! Why do you think this needs to be a callback, i.e. what use case do you want to cover with that? What would be the input to that callback?</p> </blockquote> <p dir="auto">This is for multiple reasons.</p> <ol dir="auto"> <li>You might not be writing 1 file. You might be writing multiple files (each needing different metadata). This might be an effect of the partition sinks or <code class="notranslate">partition_by</code> on <code class="notranslate">write_parquet</code>.</li> <li>People often have long-running queries and want to include time stamps at the time of actually writing instead of at the time of query definition.</li> <li>We have heard that people may want to modify the metadata that we write ourselves. Mostly the ParquetSchema. A callback would allow for that.</li> </ol> <p dir="auto">So the input should be some kind of context (so the callback can be pure) and the existing metadata.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="a5OUOhPFOM9u-nRFHRNxZ2tulO5TV9oDMWYj00qIwLZm3bU9oK3pJGYzblD6ney1O431b0ODla8IhvKk1vzSsg" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786i31oT"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options 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ml-1">Contributor</span> </span> <span aria-label="This user is the author of this pull request." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Author</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero">borchero</a> </strong> commented <a href="#issuecomment-2733048400" id="issuecomment-2733048400-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-18T12:29:09Z" class="no-wrap">Mar 18, 2025</relative-time></a> <span class="js-comment-edit-history"> <span class="d-inline-block color-fg-muted">•</span> <details class="details-overlay details-reset d-inline-block dropdown hx_dropdown-fullscreen"> <summary class="btn-link no-underline color-fg-muted js-notice"> <div class="position-relative"> <span> edited </span> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-triangle-down v-align-middle"> <path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path> </svg> </div> </summary> <details-menu class="dropdown-menu dropdown-menu-s width-auto py-0 js-comment-edit-history-menu" style="max-width: 352px; z-index: 99;" src="/user_content_edits/show_edit_history_log/IC_kwDOD7gq786i5wJQ" preload > <include-fragment class="my-3" style="min-width: 100px;" aria-label="Loading..."> <span data-view-component="true"> <svg style="box-sizing: content-box; color: var(--color-icon-primary);" width="32" height="32" viewBox="0 0 16 16" fill="none" aria-hidden="true" data-view-component="true" class="mx-auto d-block anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" fill="none" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg> <span class="sr-only">Loading</span> </span> </include-fragment> </details-menu> </details> </span> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">That makes sense! What do you think about the following:</p> <ul dir="auto"> <li> <p dir="auto">Add <code class="notranslate">key_value_metadata</code> to <code class="notranslate">ParquetWriteOptions</code> to allow accessing it both when writing a single Parquet file and a partitioned dataset</p> </li> <li> <p dir="auto">Change the <code class="notranslate">key_value_metadata</code> to</p> <div class="highlight highlight-source-rust notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="key_value_metadata_fn: Option<Box<dyn Fn(ParquetMetadata) -> Vec<KeyValue>>>"><pre class="notranslate">key_value_metadata_fn<span class="pl-kos">:</span> <span class="pl-v">Option</span><<span class="pl-v">Box</span><<span class="pl-en">dyn</span> <span class="pl-v">Fn</span><span class="pl-kos">(</span><span class="pl-v">ParquetMetadata</span><span class="pl-kos">)</span> -> <span class="pl-v">Vec</span><<span class="pl-v">KeyValue</span>>>></pre></div> <p dir="auto">The most important question I have: <strong>What do you think <code class="notranslate">ParquetMetadata</code> should be here?</strong> The only useful information that's currently available in <code class="notranslate">write_df_to_file</code> is <code class="notranslate">path</code>. We could, of course, still add a timestamp, if we think that is valuable but the user could also get the current timestamp in the callback. In general, I think it would be fine to start off with a minimal subset here and extend it in the future.</p> </li> <li> <p dir="auto">Change the Python parameter to allowing providing either "static" or "dynamic" metadata:</p> <div class="highlight highlight-source-python notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content=" metadata: dict[str, str] | Callable[[ParquetMetadataContext], dict[str, str]] | None = None"><pre class="notranslate"> <span class="pl-s1">metadata</span>: <span class="pl-s1">dict</span>[<span class="pl-smi">str</span>, <span class="pl-smi">str</span>] <span class="pl-c1">|</span> <span class="pl-v">Callable</span>[[<span class="pl-v">ParquetMetadataContext</span>], <span class="pl-s1">dict</span>[<span class="pl-smi">str</span>, <span class="pl-smi">str</span>]] <span class="pl-c1">|</span> <span class="pl-c1">None</span> <span class="pl-c1">=</span> <span class="pl-c1">None</span></pre></div> </li> </ul> </td> </tr> 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</div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-2733213618"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="319e14edd0fa2a6190020ffe1335eec8ba28fd22524bef91bd52783cbe9faddb"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-2733213618-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has been invited to collaborate on the polars repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Collaborator</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/coastalwhite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/coastalwhite">coastalwhite</a> </strong> commented <a href="#issuecomment-2733213618" id="issuecomment-2733213618-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-18T13:24:38Z" class="no-wrap">Mar 18, 2025</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <blockquote> <ul dir="auto"> <li>Add <code class="notranslate">key_value_metadata</code> to <code class="notranslate">ParquetWriteOptions</code> to allow accessing it both when writing a single Parquet file and a partitioned dataset</li> </ul> </blockquote> <p dir="auto">Yes.</p> <blockquote> <ul dir="auto"> <li> <p dir="auto">Change the <code class="notranslate">key_value_metadata</code> to</p> <div class="highlight highlight-source-rust notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="key_value_metadata_fn: Option<Box<dyn Fn(ParquetMetadata) -> Vec<KeyValue>>>"><pre class="notranslate">key_value_metadata_fn<span class="pl-kos">:</span> <span class="pl-v">Option</span><<span class="pl-v">Box</span><<span class="pl-en">dyn</span> <span class="pl-v">Fn</span><span class="pl-kos">(</span><span class="pl-v">ParquetMetadata</span><span class="pl-kos">)</span> -> <span class="pl-v">Vec</span><<span class="pl-v">KeyValue</span>>>></pre></div> <p dir="auto">The most important question I have: <strong>What do you think <code class="notranslate">ParquetMetadata</code> should be here?</strong> The only useful information that's currently available in <code class="notranslate">write_df_to_file</code> is <code class="notranslate">path</code>. We could, of course, still add a timestamp, if we think that is valuable but the user could also get the current timestamp in the callback. In general, I think it would be fine to start off with a minimal subset here and extend it in the future.</p> </li> </ul> </blockquote> <p dir="auto">This needs to take a <code class="notranslate">PyFunction</code> or an <code class="notranslate">enum { Python(PyFunction), Rust(Box<dyn Fn...>) }</code> as a box dyn fn is not serializable.</p> <p dir="auto">As for the ParquetMetadata would have 2 fields for now. <code class="notranslate">current_metadata</code> and <code class="notranslate">context</code>.</p> <blockquote> <ul dir="auto"> <li>Change the Python parameter to allowing providing either "static" or "dynamic" metadata:</li> </ul> </blockquote> <p dir="auto">That looks fine.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container has-reactions d-flex"> <!-- '"` --><!-- </textarea></xmp> 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class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="8263a300d2a7450f6a0b92fbc8c826b2b27bbc26ee95d6a6132b162738be0ff0"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-2734089252-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has previously committed to the polars repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Contributor</span> </span> <span aria-label="This user is the author of this pull request." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Author</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero">borchero</a> </strong> commented <a href="#issuecomment-2734089252" id="issuecomment-2734089252-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-18T17:14:50Z" class="no-wrap">Mar 18, 2025</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">While implementing, I was a little unsure how to circumvent</p> <blockquote> <p dir="auto">box dyn fn is not serializable</p> </blockquote> <p dir="auto">In my mind, this also eliminates the second enum case (i.e. <code class="notranslate">Rust(Box<dyn Fn...>)</code>) and, so far, I didn't really know which <code class="notranslate">pyo3</code> type to use to get a serializable kind of "PyFunction". Ideally, this type would be clone-able, and implement <code class="notranslate">PartialEq</code>, <code class="notranslate">Eq</code>, and <code class="notranslate">Hash</code> or the <code class="notranslate">FileType</code> enum would need to lose some trait implementations 👀 do you have a pointer <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/coastalwhite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/coastalwhite">@coastalwhite</a>?</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="P0Q-3DJRU_2H5v1kpUotTiYc-FV1NoqcsS328kfjYxwyCh_bgTmCFo8v53FCxLCcdv-Z1GXixTCIzSeF25dxGA" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786i9uQk"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2734089252-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2734089252" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="0ePvhGY5xxR9HGdAPC6GvD5VW7hEiYBAJNMuPKoMQGN7tAP1Ht13wlKL93TjYQ149qivNevkmSOcvw22luHs7g==" /> <include-fragment loading="lazy" src="/pola-rs/polars/issue_comments/2734089252/edit_form?textarea_id=issuecomment-2734089252-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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You can have a look at CredentialProvider at how that is done there.</p> <p dir="auto">As for clone, you should probably use an Arc<dyn Fn ...> that will be clone. For now, you can make hash a no-op. I will need to look into how we do that elsewhere.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container has-reactions d-flex"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="8OXi4LpnLdpsEwMK9X3umNONxS0W9j4r6rvE4hInmxH9q8PnCQ_8MWTaGR8S83NKg26krAYicYfTWxWVjlOJFQ" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786i93Tg"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <button name="input[content]" id="reactions--reaction_button_component-dbf117" value="THUMBS_UP react" data-button-index-position="0" data-reaction-label="+1" data-reaction-content="+1" aria-pressed="false" aria-label="react with thumbs up" type="submit" disabled="disabled" data-view-component="true" class="social-reaction-summary-item js-reaction-group-button btn-link d-flex no-underline color-fg-muted flex-items-baseline mr-2"> <g-emoji alias="+1" fallback-src="https://github.githubassets.com/assets/1f44d-41cb66fe1e22.png" class="social-button-emoji">👍</g-emoji> <span class="js-discussion-reaction-group-count">1</span> </button> <tool-tip id="tooltip-5fe6acb8-faa0-4c7f-a7d1-0272af7af070" for="reactions--reaction_button_component-dbf117" popover="manual" data-direction="n" data-type="description" data-view-component="true" class="sr-only position-absolute">borchero reacted with thumbs up emoji</tool-tip> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> <li class="dropdown-item" aria-label="borchero reacted with thumbs up emoji"> <g-emoji alias="+1" fallback-src="https://github.githubassets.com/assets/1f44d-41cb66fe1e22.png" class="social-button-emoji mr-2">👍</g-emoji> <span>1 reaction</span> </li> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2734126304-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2734126304" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="1rIz4EuVwZQ40kbNJfv7Eya0MKf9mB7GiGm+TgniKemRyMI6/4ZDCBvmjIV81GkRc8bnjnrKQLnHaUooIU7sZg==" /> <include-fragment loading="lazy" src="/pola-rs/polars/issue_comments/2734126304/edit_form?textarea_id=issuecomment-2734126304-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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height:12px;"></span> </div> </batch-deferred-content> </div> </div> <div class="text-right ml-1"> <code> <a href="/pola-rs/polars/pull/21806/commits/908d249233887a4b5c82cb31682306f991657589" class="Link--secondary">908d249</a> </code> </div> </div> </div> </div> </div> </div> <div data-view-component="true" class="TimelineItem TimelineItem--condensed"> <div data-view-component="true" class="TimelineItem-badge"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-git-commit"> <path d="M11.93 8.5a4.002 4.002 0 0 1-7.86 0H.75a.75.75 0 0 1 0-1.5h3.32a4.002 4.002 0 0 1 7.86 0h3.32a.75.75 0 0 1 0 1.5Zm-1.43-.75a2.5 2.5 0 1 0-5 0 2.5 2.5 0 0 0 5 0Z"></path> </svg></div> <div data-view-component="true" class="TimelineItem-body"> <div class="js-details-container Details js-socket-channel js-updatable-content"> <div class="d-flex flex-md-row flex-column"> <div class="d-flex flex-auto"> <div class="AvatarStack flex-self-start " > <div class="AvatarStack-body" > <a class="avatar avatar-user" style="width:20px;height:20px;" data-test-selector="commits-avatar-stack-avatar-link" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"> <img data-test-selector="commits-avatar-stack-avatar-image" src="https://avatars.githubusercontent.com/u/22455425?s=40&v=4" width="20" height="20" alt="@borchero" class=" avatar-user" /> </a> </div> </div> <div class="pr-1 flex-auto min-width-0" > <code> <a title="Fix lint" data-pjax="true" class="Link--secondary markdown-title" href="/pola-rs/polars/pull/21806/commits/7a0e3ce2e704ef9ced18b7aaad4a0fd4dd9ada8b">Fix lint</a> </code> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content class="d-inline-block" data-url="/commits/badges"> <input type="hidden" name="id" value="C_kwDOJ1jhktoAKDdhMGUzY2UyZTcwNGVmOWNlZDE4YjdhYWFkNGEwZmQ0ZGQ5YWRhOGI" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="badge_size" value="small" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="dropdown_direction" value="s" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <span class="Skeleton d-inline-block mr-1" style="width:75px; 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height:12px;"></span> </div> </batch-deferred-content> </div> </div> <div class="text-right ml-1"> <code> <a href="/pola-rs/polars/pull/21806/commits/7a0e3ce2e704ef9ced18b7aaad4a0fd4dd9ada8b" class="Link--secondary">7a0e3ce</a> </code> </div> </div> </div> </div> </div> </div> <div data-view-component="true" class="TimelineItem TimelineItem--condensed"> <div data-view-component="true" class="TimelineItem-badge"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-git-commit"> <path d="M11.93 8.5a4.002 4.002 0 0 1-7.86 0H.75a.75.75 0 0 1 0-1.5h3.32a4.002 4.002 0 0 1 7.86 0h3.32a.75.75 0 0 1 0 1.5Zm-1.43-.75a2.5 2.5 0 1 0-5 0 2.5 2.5 0 0 0 5 0Z"></path> </svg></div> <div data-view-component="true" class="TimelineItem-body"> <div class="js-details-container Details js-socket-channel js-updatable-content"> <div class="d-flex flex-md-row flex-column"> <div class="d-flex flex-auto"> <div class="AvatarStack flex-self-start " > <div class="AvatarStack-body" > <a class="avatar avatar-user" style="width:20px;height:20px;" data-test-selector="commits-avatar-stack-avatar-link" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"> <img data-test-selector="commits-avatar-stack-avatar-image" src="https://avatars.githubusercontent.com/u/22455425?s=40&v=4" width="20" height="20" alt="@borchero" class=" avatar-user" /> </a> </div> </div> <div class="pr-1 flex-auto min-width-0" > <code> <a title="Fix clippy" data-pjax="true" class="Link--secondary markdown-title" href="/pola-rs/polars/pull/21806/commits/e1322fe686f5e177d14e47c91d11c95a54b5b321">Fix clippy</a> </code> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content class="d-inline-block" data-url="/commits/badges"> <input type="hidden" name="id" value="C_kwDOJ1jhktoAKGUxMzIyZmU2ODZmNWUxNzdkMTRlNDdjOTFkMTFjOTVhNTRiNWIzMjE" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="badge_size" value="small" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="dropdown_direction" value="s" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <span class="Skeleton d-inline-block mr-1" style="width:75px; 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height:12px;"></span> </div> </batch-deferred-content> </div> </div> <div class="text-right ml-1"> <code> <a href="/pola-rs/polars/pull/21806/commits/e1322fe686f5e177d14e47c91d11c95a54b5b321" class="Link--secondary">e1322fe</a> </code> </div> </div> </div> </div> </div> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="IC_kwDOD7gq786jA546"> <div class="TimelineItem js-comment-container" data-gid="IC_kwDOD7gq786jA546" data-url="/pola-rs/polars/comments/IC_kwDOD7gq786jA546/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/22455425?s=80&u=fd6732cb7f229b108cd3ffdd24684b683e82064f&v=4" width="40" height="40" alt="@borchero" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-2734923322"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="c6381febeb5a480c383d9c6710d7abd098a5b6b3ab488c4838263688174393d0"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-2734923322-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has previously committed to the polars repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Contributor</span> </span> <span aria-label="This user is the author of this pull request." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Author</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero">borchero</a> </strong> commented <a href="#issuecomment-2734923322" id="issuecomment-2734923322-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-18T23:06:08Z" class="no-wrap">Mar 18, 2025</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">I think we're slowly getting somewhere <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/coastalwhite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/coastalwhite">@coastalwhite</a> 😄 I have some more concrete questions:</p> <ul dir="auto"> <li> <blockquote> <p dir="auto">As for the ParquetMetadata would have 2 fields for now. current_metadata and context.</p> </blockquote> <p dir="auto">I realized that I'm not really sure what you mean with that. Judging from the third point of your "motivation" list above, I guess <code class="notranslate">current_metadata</code> should provide information beyond the key value metadata? 🤔 I'm also not sure what the <code class="notranslate">context</code> means</p> </li> <li> <p dir="auto">While it is now theoretically possible to write different metadata for different parquet files in partitioned datasets, I'm not really sure how to best pass information about the partition to the metadata function. Do you have a proposal here?</p> </li> <li> <p dir="auto">Do we actually generate the key value metadata in the right place or do we have to do it even later, i.e. when we have already built the full metadata object? Similarly, do you think that the parquet metadata should return the <em>full</em> metadata object? 🤔 I'd think that gives a little <em>too</em> much freedom to the user but I think you have a better idea of other users' requirements</p> </li> </ul> <p dir="auto">Apart from that, please feel, of course, free to leave any (high-level) comments already :)</p> <p dir="auto">(I'm aware that tests are still missing, I will add them once we've converged on the design of the core implementation 😄)</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" 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data-view-component="true" class="octicon octicon-cross-reference"> <path d="M2.75 3.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h4.5a.25.25 0 0 0 .25-.25v-2.5a.75.75 0 0 1 1.5 0v2.5A1.75 1.75 0 0 1 13.25 13H9.06l-2.573 2.573A1.458 1.458 0 0 1 4 14.543V13H2.75A1.75 1.75 0 0 1 1 11.25v-7.5C1 2.784 1.784 2 2.75 2h5.5a.75.75 0 0 1 0 1.5ZM16 1.25v4.146a.25.25 0 0 1-.427.177L14.03 4.03l-3.75 3.75a.749.749 0 0 1-1.275-.326.749.749 0 0 1 .215-.734l3.75-3.75-1.543-1.543A.25.25 0 0 1 11.604 1h4.146a.25.25 0 0 1 .25.25Z"></path> </svg> </div> <div class="TimelineItem-body" > <div > <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/heshamdar/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/heshamdar"><img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/104492073?s=40&v=4" width="20" height="20" alt="@heshamdar" /></a> <a class="author Link--primary text-bold" data-hovercard-type="user" data-hovercard-url="/users/heshamdar/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/heshamdar">heshamdar</a> mentioned this pull request <a class="Link--secondary" href="#ref-issue-2930640736" > <relative-time datetime="2025-03-19T06:42:39Z" class="no-wrap">Mar 19, 2025</relative-time> </a> </div> <div class="mt-2 d-flex flex-items-start flex-column flex-md-row"> <div class="flex-auto wb-break-word" id="ref-issue-2930640736" > <a href="/lmmx/polars-config-meta/issues/6" class="Link--primary f4 text-bold markdown-title" data-hovercard-type="issue" data-hovercard-url="/lmmx/polars-config-meta/issues/6/hovercard"> Functionality possibly supported in polars itself <span class="color-fg-muted text-normal" >lmmx/polars-config-meta#6</span> </a> </div> <div class="flex-shrink-0 my-1 my-md-0 ml-md-3"> <span title="Status: Closed" data-view-component="true" class="State State--merged State--small 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0-1.5h3.32a4.002 4.002 0 0 1 7.86 0h3.32a.75.75 0 0 1 0 1.5Zm-1.43-.75a2.5 2.5 0 1 0-5 0 2.5 2.5 0 0 0 5 0Z"></path> </svg></div> <div data-view-component="true" class="TimelineItem-body"> <div class="js-details-container Details js-socket-channel js-updatable-content"> <div class="d-flex flex-md-row flex-column"> <div class="d-flex flex-auto"> <div class="AvatarStack flex-self-start " > <div class="AvatarStack-body" > <a class="avatar avatar-user" style="width:20px;height:20px;" data-test-selector="commits-avatar-stack-avatar-link" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"> <img data-test-selector="commits-avatar-stack-avatar-image" src="https://avatars.githubusercontent.com/u/22455425?s=40&v=4" width="20" height="20" alt="@borchero" class=" avatar-user" /> </a> </div> </div> <div class="pr-1 flex-auto min-width-0" > <code> <a title="Merge branch 'main' into parquet-metadata" data-pjax="true" class="Link--secondary markdown-title" href="/pola-rs/polars/pull/21806/commits/5b2905809bb932d0bcaa78a2adfbdd563634dbff">Merge branch 'main' into parquet-metadata</a> </code> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content class="d-inline-block" data-url="/commits/badges"> <input type="hidden" name="id" value="C_kwDOJ1jhktoAKDViMjkwNTgwOWJiOTMyZDBiY2FhNzhhMmFkZmJkZDU2MzYzNGRiZmY" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="badge_size" value="small" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="dropdown_direction" value="s" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <span class="Skeleton d-inline-block mr-1" style="width:75px; height:14px; margin-bottom:-4px;"></span> </batch-deferred-content> </div> <div class="pr-1 flex-shrink-0" style="width: 16px;"> <div class="js-socket-channel js-updatable-content" 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css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/coastalwhite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/coastalwhite">coastalwhite</a> </strong> commented <a href="#issuecomment-2739505930" id="issuecomment-2739505930-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-20T08:02:04Z" class="no-wrap">Mar 20, 2025</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <blockquote> <ul dir="auto"> <li>I realized that I'm not really sure what you mean with that. Judging from the third point of your "motivation" list above, I guess <code class="notranslate">current_metadata</code> should provide information beyond the key value metadata? 🤔 I'm also not sure what the <code class="notranslate">context</code> means</li> </ul> </blockquote> <p dir="auto">I discussed for a second with someone else from the team. Essentially, the following.</p> <ul dir="auto"> <li><code class="notranslate">current_metadata</code> (maybe different name), would have the metadata as a dictionary as we were going to encode it without the callback happening.</li> <li><code class="notranslate">context</code> I was thinking it was needed for purely. It is not I have been told. We could have this to contain the <code class="notranslate">output path</code>?</li> </ul> <blockquote> <ul dir="auto"> <li>While it is now theoretically possible to write different metadata for different parquet files in partitioned datasets, I'm not really sure how to best pass information about the partition to the metadata function. Do you have a proposal here?</li> <li></li> </ul> </blockquote> <p dir="auto">I think if you make it a <code class="notranslate">context</code> dictionary, we could later add more information. For now, just the output path is fine.</p> <blockquote> <ul dir="auto"> <li>Do we actually generate the key value metadata in the right place or do we have to do it even later, i.e. when we have already built the full metadata object? Similarly, do you think that the parquet metadata should return the <em>full</em> metadata object? 🤔 I'd think that gives a little <em>too</em> much freedom to the user but I think you have a better idea of other users' requirements</li> </ul> </blockquote> <p dir="auto">I think it is the right place. Having this be the full metadata allows us to somewhat resolve <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="2389985653" data-permission-text="Title is private" data-url="https://github.com/pola-rs/polars/issues/17418" data-hovercard-type="issue" data-hovercard-url="/pola-rs/polars/issues/17418/hovercard" href="https://github.com/pola-rs/polars/issues/17418">#17418</a> for now.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="rGAJMBbyix0vozVIlhxabKJYO9HHivN8srFl4boav82hLig3pZpa9idqL11xkse-8rtaUNdevNCLUbSWJm6tyQ" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786jSYsK"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2739505930-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2739505930" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="6iS7NfqjNXzeRhi8v8QnizFin5MXyIHymC3VG9428VyAPUnfoaCPpGIWqBW7NTUIn6vcPBU7JB6GS65rWvCNSQ==" /> <include-fragment loading="lazy" src="/pola-rs/polars/issue_comments/2739505930/edit_form?textarea_id=issuecomment-2739505930-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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Sorry for all the nits.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container has-reactions d-flex"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="U83QEzdXAkvXsBykXMiw36gdbHEuZ9gi-1yCz--Uotdeg_EUhD_ToN95BrG7Ri0N-P4N8D6zl47CvFO4c-Cw0w" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786jSZAp"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <button name="input[content]" id="reactions--reaction_button_component-45c065" 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data-octo-dimensions="link_type:self" href="/borchero">borchero</a> mentioned this pull request <a class="Link--secondary" href="#ref-pullrequest-2935436369" > <relative-time datetime="2025-03-20T13:08:46Z" class="no-wrap">Mar 20, 2025</relative-time> </a> </div> <div class="mt-2 d-flex flex-items-start flex-column flex-md-row"> <div class="flex-auto wb-break-word" id="ref-pullrequest-2935436369" > <a href="/pola-rs/polars/pull/21865" class="Link--primary f4 text-bold markdown-title" data-hovercard-type="pull_request" data-hovercard-url="/pola-rs/polars/pull/21865/hovercard"> chore(rust): Remove <code>FileSink</code> from <code>polars-parquet</code> <span class="color-fg-muted text-normal" >#21865</span> </a> </div> <div class="flex-shrink-0 my-1 my-md-0 ml-md-3"> <span title="Status: Merged" data-view-component="true" class="State State--merged State--small"> <svg height="14" class="octicon octicon-git-merge" viewBox="0 0 16 16" version="1.1" width="14" aria-hidden="true"><path 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ml-1">Contributor</span> </span> <span aria-label="This user is the author of this pull request." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Author</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero">borchero</a> </strong> commented <a href="#issuecomment-2740436149" id="issuecomment-2740436149-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-20T13:19:37Z" class="no-wrap">Mar 20, 2025</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <blockquote> <p dir="auto">Thank you very much <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/borchero">@borchero</a> for the hard work at this. Sorry for all the nits.</p> </blockquote> <p dir="auto">No worries at all, thanks for spending so much time on the design yourself! :)</p> <blockquote> <p dir="auto">current_metadata (maybe different name), would have the metadata as a dictionary as we were going to encode it without the callback happening.</p> </blockquote> <p dir="auto">That makes sense to me, I'd call <code class="notranslate">schema_to_metadata_key(schema)</code> outside of <code class="notranslate">writer.end()</code> then (i.e. in <code class="notranslate">BatchedWriter.finish</code>) and only call <code class="notranslate">add_arrow_schema</code> in <code class="notranslate">FileWriter.end</code> if the input <code class="notranslate">key_value_metadata</code> is <code class="notranslate">None</code>.</p> <p dir="auto">I'd also call <code class="notranslate">current_metadata</code> simply <code class="notranslate">key_value_metadata</code>.</p> <blockquote> <p dir="auto">context I was thinking it was needed for purely. It is not I have been told. We could have this to contain the output path?<br> ...<br> I think if you make it a context dictionary, we could later add more information. For now, just the output path is fine.</p> </blockquote> <p dir="auto">With this design, I'd now define</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="pub struct KeyValueMetadataContext { key_value_metadata: Vec<KeyValue>, info: PlHashMap<String, String> }"><pre class="notranslate"><code class="notranslate">pub struct KeyValueMetadataContext { key_value_metadata: Vec<KeyValue>, info: PlHashMap<String, String> } </code></pre></div> <p dir="auto">where <code class="notranslate">info</code> potentially contains <code class="notranslate">"output_path"</code>. Does that summarize your thoughts well <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/coastalwhite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/coastalwhite">@coastalwhite</a>? 😄</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="cSAmSN1_TLgYARyLWpNZBglFlgjfJQFuS1fa2kJ1i2V8bgdPbhedUxDIBp69HcTUWab3ic_xTsJytwut3gGZYQ" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786jV7y1"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2740436149-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2740436149" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="KIblqvkFlOaf5k5AjZ1FmqdBD481PIatwFtYPwQZpCPoxyasFeftcc19uXpEadM71JhqKIGIKBe0/C9aVkviag==" /> <include-fragment loading="lazy" src="/pola-rs/polars/issue_comments/2740436149/edit_form?textarea_id=issuecomment-2740436149-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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height:12px;"></span> </div> </batch-deferred-content> </div> </div> <div class="text-right ml-1"> <code> <a href="/pola-rs/polars/pull/21806/commits/bd96da94ffaa9fbdcdc2b09972594ea7d17ce92f" class="Link--secondary">bd96da9</a> </code> </div> </div> </div> </div> </div> </div> <div data-view-component="true" class="TimelineItem TimelineItem--condensed"> <div data-view-component="true" class="TimelineItem-badge"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-git-commit"> <path d="M11.93 8.5a4.002 4.002 0 0 1-7.86 0H.75a.75.75 0 0 1 0-1.5h3.32a4.002 4.002 0 0 1 7.86 0h3.32a.75.75 0 0 1 0 1.5Zm-1.43-.75a2.5 2.5 0 1 0-5 0 2.5 2.5 0 0 0 5 0Z"></path> </svg></div> <div data-view-component="true" class="TimelineItem-body"> <div class="js-details-container Details js-socket-channel js-updatable-content"> <div class="d-flex flex-md-row flex-column"> <div class="d-flex flex-auto"> <div class="AvatarStack flex-self-start " > <div class="AvatarStack-body" > <a class="avatar avatar-user" style="width:20px;height:20px;" data-test-selector="commits-avatar-stack-avatar-link" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"> <img data-test-selector="commits-avatar-stack-avatar-image" src="https://avatars.githubusercontent.com/u/22455425?s=40&v=4" width="20" height="20" alt="@borchero" class=" avatar-user" /> </a> </div> </div> <div class="pr-1 flex-auto min-width-0" > <code> <a title="Review cw" data-pjax="true" class="Link--secondary markdown-title" href="/pola-rs/polars/pull/21806/commits/97a1bb1cc9c3c8778b64af02deffccaa7ebd91af">Review cw</a> </code> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content class="d-inline-block" data-url="/commits/badges"> <input type="hidden" name="id" value="C_kwDOJ1jhktoAKDk3YTFiYjFjYzljM2M4Nzc4YjY0YWYwMmRlZmZjY2FhN2ViZDkxYWY" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="badge_size" value="small" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="dropdown_direction" value="s" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <span class="Skeleton d-inline-block mr-1" style="width:75px; 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height:12px;"></span> </div> </batch-deferred-content> </div> </div> <div class="text-right ml-1"> <code> <a href="/pola-rs/polars/pull/21806/commits/97a1bb1cc9c3c8778b64af02deffccaa7ebd91af" class="Link--secondary">97a1bb1</a> </code> </div> </div> </div> </div> </div> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="IC_kwDOD7gq786jYeU5"> <div class="TimelineItem js-comment-container" data-gid="IC_kwDOD7gq786jYeU5" data-url="/pola-rs/polars/comments/IC_kwDOD7gq786jYeU5/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/22455425?s=80&u=fd6732cb7f229b108cd3ffdd24684b683e82064f&v=4" width="40" height="40" alt="@borchero" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-2741101881"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="a585dd2bd8bb4bca21b732da64c75c43af25197bc14610a31e5b962449ef539a"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-2741101881-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has previously committed to the polars repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Contributor</span> </span> <span aria-label="This user is the author of this pull request." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Author</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero">borchero</a> </strong> commented <a href="#issuecomment-2741101881" id="issuecomment-2741101881-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-20T16:53:27Z" class="no-wrap">Mar 20, 2025</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/coastalwhite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/coastalwhite">@coastalwhite</a> I updated the Rust part according to my comment above, probably easier to talk about code. Let me know what you think :)</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="WACVF3XtXzGWFFQt6AsgZdwCl3r9MM_b8zz-_ZQS4aZVTrQQxoWO2p7dTjgPhb23jOH2--3kgHfK3C-KCGbzog" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786jYeU5"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2741101881-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2741101881" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="B8MiynrgiWniG4pDk1yDRRRyhQsp7jYvWy70UTupbY6HvP/pe2HeWP3J8r5IE3zior4sRauQZQ9S8U6YsagpQw==" /> <include-fragment loading="lazy" src="/pola-rs/polars/issue_comments/2741101881/edit_form?textarea_id=issuecomment-2741101881-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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height:12px;"></span> </div> </batch-deferred-content> </div> </div> <div class="text-right ml-1"> <code> <a href="/pola-rs/polars/pull/21806/commits/97c825604cab186edeea0110a217050194e164f7" class="Link--secondary">97c8256</a> </code> </div> </div> </div> </div> </div> </div> <div data-view-component="true" class="TimelineItem TimelineItem--condensed"> <div data-view-component="true" class="TimelineItem-badge"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-git-commit"> <path d="M11.93 8.5a4.002 4.002 0 0 1-7.86 0H.75a.75.75 0 0 1 0-1.5h3.32a4.002 4.002 0 0 1 7.86 0h3.32a.75.75 0 0 1 0 1.5Zm-1.43-.75a2.5 2.5 0 1 0-5 0 2.5 2.5 0 0 0 5 0Z"></path> </svg></div> <div data-view-component="true" class="TimelineItem-body"> <div class="js-details-container Details js-socket-channel js-updatable-content"> <div class="d-flex flex-md-row flex-column"> <div class="d-flex flex-auto"> <div class="AvatarStack flex-self-start " > <div class="AvatarStack-body" > <a class="avatar avatar-user" style="width:20px;height:20px;" data-test-selector="commits-avatar-stack-avatar-link" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"> <img data-test-selector="commits-avatar-stack-avatar-image" src="https://avatars.githubusercontent.com/u/22455425?s=40&v=4" width="20" height="20" alt="@borchero" class=" avatar-user" /> </a> </div> </div> <div class="pr-1 flex-auto min-width-0" > <code> <a title="Fix mypy" data-pjax="true" class="Link--secondary markdown-title" href="/pola-rs/polars/pull/21806/commits/2591a0d3c55da6cec3018c88f3e31cfd6f91a9b1">Fix mypy</a> </code> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content class="d-inline-block" data-url="/commits/badges"> <input type="hidden" name="id" value="C_kwDOJ1jhktoAKDI1OTFhMGQzYzU1ZGE2Y2VjMzAxOGM4OGYzZTMxY2ZkNmY5MWE5YjE" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="badge_size" value="small" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="dropdown_direction" value="s" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <span class="Skeleton d-inline-block mr-1" style="width:75px; 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height:12px;"></span> </div> </batch-deferred-content> </div> </div> <div class="text-right ml-1"> <code> <a href="/pola-rs/polars/pull/21806/commits/2591a0d3c55da6cec3018c88f3e31cfd6f91a9b1" class="Link--secondary">2591a0d</a> </code> </div> </div> </div> </div> </div> </div> <div data-view-component="true" class="TimelineItem TimelineItem--condensed"> <div data-view-component="true" class="TimelineItem-badge"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-git-commit"> <path d="M11.93 8.5a4.002 4.002 0 0 1-7.86 0H.75a.75.75 0 0 1 0-1.5h3.32a4.002 4.002 0 0 1 7.86 0h3.32a.75.75 0 0 1 0 1.5Zm-1.43-.75a2.5 2.5 0 1 0-5 0 2.5 2.5 0 0 0 5 0Z"></path> </svg></div> <div data-view-component="true" class="TimelineItem-body"> <div class="js-details-container Details js-socket-channel js-updatable-content"> <div class="d-flex flex-md-row flex-column"> <div class="d-flex flex-auto"> <div class="AvatarStack flex-self-start " > <div class="AvatarStack-body" > <a class="avatar avatar-user" style="width:20px;height:20px;" data-test-selector="commits-avatar-stack-avatar-link" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"> <img data-test-selector="commits-avatar-stack-avatar-image" src="https://avatars.githubusercontent.com/u/22455425?s=40&v=4" width="20" height="20" alt="@borchero" class=" avatar-user" /> </a> </div> </div> <div class="pr-1 flex-auto min-width-0" > <code> <a title="Fix mypy (again)" data-pjax="true" class="Link--secondary markdown-title" href="/pola-rs/polars/pull/21806/commits/4ac6e6b8c365879af1abf6d4450916d28aea1e8e">Fix mypy (again)</a> </code> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content class="d-inline-block" data-url="/commits/badges"> <input type="hidden" name="id" value="C_kwDOJ1jhktoAKDRhYzZlNmI4YzM2NTg3OWFmMWFiZjZkNDQ1MDkxNmQyOGFlYTFlOGU" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="badge_size" value="small" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="dropdown_direction" value="s" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <span class="Skeleton d-inline-block mr-1" style="width:75px; height:14px; margin-bottom:-4px;"></span> </batch-deferred-content> </div> <div class="pr-1 flex-shrink-0" style="width: 16px;"> <div class="js-socket-channel js-updatable-content" data-channel="eyJjIjoicmVwbzoyNjM3Mjc4NTU6Y29tbWl0OjRhYzZlNmI4YzM2NTg3OWFmMWFiZjZkNDQ1MDkxNmQyOGFlYTFlOGUiLCJ0IjoxNzQzMDA5ODE5fQ==--c6500ae112e072ff6c35697c2770374cf161bdafaf6d2bd268ecc55c3df3ea99" data-url="/pola-rs/polars/pull/21806/partials/commit_status_icon?oid=4ac6e6b8c365879af1abf6d4450916d28aea1e8e"> <batch-deferred-content class="d-inline-block" data-url="/pola-rs/polars/commits/checks-statuses-rollups"> <input type="hidden" name="oid" value="4ac6e6b8c365879af1abf6d4450916d28aea1e8e" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="dropdown_direction" value="w" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="disable_live_updates" value="false" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <div class="commit-build-statuses"> <span class="Skeleton d-inline-block" style="width:12px; height:12px;"></span> </div> </batch-deferred-content> </div> </div> <div class="text-right ml-1"> <code> <a href="/pola-rs/polars/pull/21806/commits/4ac6e6b8c365879af1abf6d4450916d28aea1e8e" class="Link--secondary">4ac6e6b</a> </code> </div> </div> </div> </div> </div> </div> <div data-view-component="true" class="TimelineItem TimelineItem--condensed"> <div data-view-component="true" class="TimelineItem-badge"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-git-commit"> <path d="M11.93 8.5a4.002 4.002 0 0 1-7.86 0H.75a.75.75 0 0 1 0-1.5h3.32a4.002 4.002 0 0 1 7.86 0h3.32a.75.75 0 0 1 0 1.5Zm-1.43-.75a2.5 2.5 0 1 0-5 0 2.5 2.5 0 0 0 5 0Z"></path> </svg></div> <div data-view-component="true" class="TimelineItem-body"> <div class="js-details-container Details js-socket-channel js-updatable-content"> <div class="d-flex flex-md-row flex-column"> <div class="d-flex flex-auto"> <div class="AvatarStack flex-self-start " > <div class="AvatarStack-body" > <a class="avatar avatar-user" style="width:20px;height:20px;" data-test-selector="commits-avatar-stack-avatar-link" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"> <img data-test-selector="commits-avatar-stack-avatar-image" src="https://avatars.githubusercontent.com/u/22455425?s=40&v=4" width="20" height="20" alt="@borchero" class=" avatar-user" /> </a> </div> </div> <div class="pr-1 flex-auto min-width-0" > <code> <a title="Fix mypy?" data-pjax="true" class="Link--secondary markdown-title" href="/pola-rs/polars/pull/21806/commits/c20f7eb031429332f05e4dc3bac5c558819d96c5">Fix mypy?</a> </code> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content class="d-inline-block" data-url="/commits/badges"> <input type="hidden" name="id" value="C_kwDOJ1jhktoAKGMyMGY3ZWIwMzE0MjkzMzJmMDVlNGRjM2JhYzVjNTU4ODE5ZDk2YzU" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="badge_size" value="small" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="dropdown_direction" value="s" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <span class="Skeleton d-inline-block mr-1" style="width:75px; height:14px; margin-bottom:-4px;"></span> </batch-deferred-content> </div> <div class="pr-1 flex-shrink-0" style="width: 16px;"> <div class="js-socket-channel js-updatable-content" data-channel="eyJjIjoicmVwbzoyNjM3Mjc4NTU6Y29tbWl0OmMyMGY3ZWIwMzE0MjkzMzJmMDVlNGRjM2JhYzVjNTU4ODE5ZDk2YzUiLCJ0IjoxNzQzMDA5ODE5fQ==--ab1f7bbccb501e1b3beda6963444345c7f8340bfd150e7b7d1ce8e0b18db4cfd" data-url="/pola-rs/polars/pull/21806/partials/commit_status_icon?oid=c20f7eb031429332f05e4dc3bac5c558819d96c5"> <batch-deferred-content class="d-inline-block" data-url="/pola-rs/polars/commits/checks-statuses-rollups"> <input type="hidden" name="oid" value="c20f7eb031429332f05e4dc3bac5c558819d96c5" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="dropdown_direction" value="w" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <input type="hidden" name="disable_live_updates" value="false" autocomplete="off" data-targets="batch-deferred-content.inputs" /> <div class="commit-build-statuses"> <span class="Skeleton d-inline-block" style="width:12px; height:12px;"></span> </div> </batch-deferred-content> </div> </div> <div class="text-right ml-1"> <code> <a href="/pola-rs/polars/pull/21806/commits/c20f7eb031429332f05e4dc3bac5c558819d96c5" class="Link--secondary">c20f7eb</a> </code> </div> </div> </div> </div> </div> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="IC_kwDOD7gq786joE_o"> <div class="TimelineItem js-comment-container" data-gid="IC_kwDOD7gq786joE_o" data-url="/pola-rs/polars/comments/IC_kwDOD7gq786joE_o/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/ion-elgreco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/ion-elgreco"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/15728914?s=80&u=21377936bc0c0eae133c684da4d42c926e4dc00f&v=4" width="40" height="40" alt="@ion-elgreco" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-2745192424"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="fb07dade2399a89275959cc033c859819e1e477fad5bd3e34aab7f0bcffdabd2"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-2745192424-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has previously committed to the polars repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Contributor</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/ion-elgreco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/ion-elgreco">ion-elgreco</a> </strong> commented <a href="#issuecomment-2745192424" id="issuecomment-2745192424-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-22T10:05:10Z" class="no-wrap">Mar 22, 2025</relative-time></a> <span class="js-comment-edit-history"> <span class="d-inline-block color-fg-muted">•</span> <details class="details-overlay details-reset d-inline-block dropdown hx_dropdown-fullscreen"> <summary class="btn-link no-underline color-fg-muted js-notice"> <div class="position-relative"> <span> edited </span> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-triangle-down v-align-middle"> <path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path> </svg> </div> </summary> <details-menu class="dropdown-menu dropdown-menu-s width-auto py-0 js-comment-edit-history-menu" style="max-width: 352px; z-index: 99;" src="/user_content_edits/show_edit_history_log/IC_kwDOD7gq786joE_o" preload > <include-fragment class="my-3" style="min-width: 100px;" aria-label="Loading..."> <span data-view-component="true"> <svg style="box-sizing: content-box; color: var(--color-icon-primary);" width="32" height="32" viewBox="0 0 16 16" fill="none" aria-hidden="true" data-view-component="true" class="mx-auto d-block anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" fill="none" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg> <span class="sr-only">Loading</span> </span> </include-fragment> </details-menu> </details> </span> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">Wouldn't it be better have polars-arrow support metadata passthrough on the arrow types, which can then be written into parquet. Then you would be able to properly round trip it since it's part of the schema</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="Ak4e2edLw3NF8hQzDHGwPvvcfXdZra1Tw6Kbz393VL0PAD_eVCMSmE07Dibr_y3sqz8c9kl54v_6Qkq44wNGuQ" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786joE_o"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2745192424-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2745192424" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="WGmg6OPcLyrvJo6uHz0IkgYWRXsxo6Bum+h31F8qiG3ZAFBNmb+nHkAS7ZxBgks+pvi59sI5iLfiAIqQl//3QQ==" /> <include-fragment loading="lazy" src="/pola-rs/polars/issue_comments/2745192424/edit_form?textarea_id=issuecomment-2745192424-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; color: var(--color-icon-primary);" width="32" height="32" viewBox="0 0 16 16" fill="none" role="img" data-view-component="true" class="anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" fill="none" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg></span> </p> <p class="ml-1 mb-2 mt-2" data-show-on-error hidden> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-alert"> <path d="M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> Sorry, something went wrong. </p> </include-fragment> </form> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="IC_kwDOD7gq786joFlF"> <div class="TimelineItem js-comment-container" data-gid="IC_kwDOD7gq786joFlF" data-url="/pola-rs/polars/comments/IC_kwDOD7gq786joFlF/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/22455425?s=80&u=fd6732cb7f229b108cd3ffdd24684b683e82064f&v=4" width="40" height="40" alt="@borchero" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-2745194821"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="0ff1779809bccbab529442f63c7254ba904cd7ae231eafc2d549b1380c43467d"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-2745194821-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has previously committed to the polars repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Contributor</span> </span> <span aria-label="This user is the author of this pull request." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Author</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero">borchero</a> </strong> commented <a href="#issuecomment-2745194821" id="issuecomment-2745194821-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-22T10:09:57Z" class="no-wrap">Mar 22, 2025</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/ion-elgreco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/ion-elgreco">@ion-elgreco</a> I'm not sure what you mean exactly. Are you referring to field-level metadata? The purpose of this PR is to add arbitrary key-value pairs to the parquet file as a whole 🤔</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="EPSrgsQYqYCkRQLLznowmNLNKfCwYQsrEkrjR-KPTmkduoqFd3B4a6yMGN4p9K1Kgi5IcaC1RIcrqjIwfvtcbQ" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786joFlF"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2745194821-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2745194821" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="Ey/+7aPDVb9a3K5smT7l+IfWXVas8Pnch4nKhOKCND542N9rsouZPsy1AcuOabl5YEq97RZ8ZGCbIHgCDJG8Yw==" /> <include-fragment loading="lazy" src="/pola-rs/polars/issue_comments/2745194821/edit_form?textarea_id=issuecomment-2745194821-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; color: var(--color-icon-primary);" width="32" height="32" viewBox="0 0 16 16" fill="none" role="img" data-view-component="true" class="anim-rotate"> <circle cx="8" cy="8" r="7" stroke="currentColor" stroke-opacity="0.25" stroke-width="2" vector-effect="non-scaling-stroke" fill="none" /> <path d="M15 8a7.002 7.002 0 00-7-7" stroke="currentColor" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" /> </svg></span> </p> <p class="ml-1 mb-2 mt-2" data-show-on-error hidden> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-alert"> <path d="M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> Sorry, something went wrong. </p> </include-fragment> </form> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="IC_kwDOD7gq786joGZc"> <div class="TimelineItem js-comment-container" data-gid="IC_kwDOD7gq786joGZc" data-url="/pola-rs/polars/comments/IC_kwDOD7gq786joGZc/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/ion-elgreco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/ion-elgreco"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/15728914?s=80&u=21377936bc0c0eae133c684da4d42c926e4dc00f&v=4" width="40" height="40" alt="@ion-elgreco" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-2745198172"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="4ed22202d727d01b91a8852641ea022b36d51ed27ce93ea531bf4377c0aa68e2"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-2745198172-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has previously committed to the polars repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Contributor</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/ion-elgreco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/ion-elgreco">ion-elgreco</a> </strong> commented <a href="#issuecomment-2745198172" id="issuecomment-2745198172-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-22T10:19:45Z" class="no-wrap">Mar 22, 2025</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <blockquote> <p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/ion-elgreco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/ion-elgreco">@ion-elgreco</a> I'm not sure what you mean exactly. Are you referring to field-level metadata? The purpose of this PR is to add arbitrary key-value pairs to the parquet file as a whole 🤔</p> </blockquote> <p dir="auto">Also an arrow schema can hold metadata.<br> Arrow c, and arrow-rs allow this</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="Yg0NTGh5ISoG0UvnFxrud2mPYUr6vj_OQFtNqG6_g2ZvQyxL2xHwwQ4YUfLwlHOlOWwAy-pqcGJ5u5zf8suRYg" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786joGZc"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2745198172-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2745198172" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="5/oVSoNei27/wFyD9puFy6/lS/rSDH9WbmXxJg2IpQ5qAk0HYmYqC/J6LV0ZyYrZAoQ2Y2KmNo1MtO+JWEyZjA==" /> 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octicon-alert"> <path d="M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> Sorry, something went wrong. </p> </include-fragment> </form> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="IC_kwDOD7gq786jtlDj"> <div class="TimelineItem js-comment-container" data-gid="IC_kwDOD7gq786jtlDj" data-url="/pola-rs/polars/comments/IC_kwDOD7gq786jtlDj/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/22455425?s=80&u=fd6732cb7f229b108cd3ffdd24684b683e82064f&v=4" width="40" height="40" alt="@borchero" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-2746634467"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="07e32424b6dd66e31de8a886005077c12e7ce8ba1f1acf214e6cd4904812d117"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-2746634467-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has previously committed to the polars repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Contributor</span> </span> <span aria-label="This user is the author of this pull request." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Author</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/borchero/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/borchero">borchero</a> </strong> commented <a href="#issuecomment-2746634467" id="issuecomment-2746634467-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2025-03-24T01:09:36Z" class="no-wrap">Mar 24, 2025</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">Ha, thanks for elaborating <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/ion-elgreco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/ion-elgreco">@ion-elgreco</a>, I did not know about this feature of Arrow schemas 😄 a few thoughts about this:</p> <ul dir="auto"> <li>The way the feature is designed now, you can supply a custom callback that modifies the Arrow schema that is written to disk (in the current version, this involves base64-decode + deserializing the IPC format, then serializing + encoding though -- potentially, this can be further improved in another PR). This means that you can theoretically attach your custom key-value pairs to the Arrow metadata instead of the Parquet file's metadata.</li> <li>Personally, I think that supporting Arrow metadata and Parquet metadata is rather orthogonal. Not all metadata that you may want to write is necessarily about the data's schema (e.g. the timestamp when the file was written).</li> </ul> <p dir="auto">Generally, it seems to me like metadata support for Arrow schema metadata would deserve its own, separate issue & design 👀</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container has-reactions d-flex"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/pola-rs/polars/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="nQB8q3BN63SZzbMSxVbleEIX6JI8uBpiUK-3R48Ef0yQTl2swyU6n5EEqQci2HiqEvSJEyxsVc5pT2YwE3BtSA" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="IC_kwDOD7gq786jtlDj"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <button name="input[content]" id="reactions--reaction_button_component-a2961d" value="THUMBS_UP react" data-button-index-position="0" data-reaction-label="+1" data-reaction-content="+1" aria-pressed="false" aria-label="react with thumbs up" type="submit" disabled="disabled" data-view-component="true" class="social-reaction-summary-item js-reaction-group-button btn-link d-flex no-underline color-fg-muted flex-items-baseline mr-2"> <g-emoji alias="+1" fallback-src="https://github.githubassets.com/assets/1f44d-41cb66fe1e22.png" class="social-button-emoji">👍</g-emoji> <span class="js-discussion-reaction-group-count">1</span> </button> <tool-tip id="tooltip-3445021a-7170-4f8e-9a1a-caae004e3f04" for="reactions--reaction_button_component-a2961d" popover="manual" data-direction="n" data-type="description" data-view-component="true" class="sr-only position-absolute">kszlim reacted with thumbs up emoji</tool-tip> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> <li class="dropdown-item" aria-label="kszlim reacted with thumbs up emoji"> <g-emoji alias="+1" fallback-src="https://github.githubassets.com/assets/1f44d-41cb66fe1e22.png" class="social-button-emoji mr-2">👍</g-emoji> <span>1 reaction</span> </li> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-2746634467-edit-form" data-turbo="false" action="/pola-rs/polars/issue_comments/2746634467" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="okLXJfYEqrzUbLtTkrm20RzcCCU2R7dDKi7DHaiF38ce1qz1QVx32OqXgzvSZp0MuS4IUW7ERxaAq/7tgd/BGQ==" /> <include-fragment loading="lazy" src="/pola-rs/polars/issue_comments/2746634467/edit_form?textarea_id=issuecomment-2746634467-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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