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Querying HBase - Apache Drill

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internal" href="/docs/architecture-introduction/">Architecture Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/drill-query-execution/">Drill Query Execution</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/core-modules/">Core Modules</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/performance/">Performance</a></li> </ul> <li class="toctree-l1"><a href="javascript: void(0);">Tutorials</a></li> <ul style="display: none"> <li class="toctree-l2"><a class="reference internal" href="/docs/tutorials-introduction/">Tutorials Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/drill-in-10-minutes/">Drill in 10 Minutes</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/analyzing-the-yelp-academic-dataset/">Analyzing the Yelp Academic Dataset</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Learn Drill with the MapR Sandbox</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/about-the-mapr-sandbox/">About the MapR Sandbox</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-apache-drill-sandbox/">Installing the Apache Drill Sandbox</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/getting-to-know-the-drill-sandbox/">Getting to Know the Drill Sandbox</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/lesson-1-learn-about-the-data-set/">Lesson 1: Learn about the Data Set</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/lesson-2-run-queries-with-ansi-sql/">Lesson 2: Run Queries with ANSI SQL</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/lesson-3-run-queries-on-complex-data-types/">Lesson 3: Run Queries on Complex Data Types</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/summary/">Summary</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/analyzing-highly-dynamic-datasets/">Analyzing Highly Dynamic Datasets</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/analyzing-social-media/">Analyzing Social Media</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/analyzing-data-using-window-functions/">Analyzing Data Using Window Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/orchestrating-queries-with-airflow/">Orchestrating queries with Airflow</a></li> </ul> <li class="toctree-l1"><a href="javascript: void(0);">Drill-on-YARN</a></li> <ul style="display: none"> <li class="toctree-l2"><a class="reference internal" href="/docs/drill-on-yarn-introduction/">Drill-on-YARN Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/creating-a-basic-drill-cluster/">Creating a Basic Drill Cluster</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/launch-drill-under-yarn/">Launch Drill Under YARN</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/configuration-reference/">Configuration Reference</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/drill-on-yarn-command-line-tool/">Drill-on-YARN Command-Line Tool</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/using-the-drill-on-yarn-web-ui/">Using the Drill-on-YARN Web UI</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/multiple-drill-clusters/">Multiple Drill Clusters</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/enabling-web-ui-security/">Enabling Web UI Security</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/appendix-a-release-note-issues/">Appendix A: Release Note Issues</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/appendix-b-drill-env-sh-settings/">Appendix B: drill-env.sh Settings</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/appendix-c-troubleshooting/">Appendix C: Troubleshooting</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/appendix-d-recreate-the-drill-archive/">Appendix D: Recreate the Drill Archive</a></li> </ul> <li class="toctree-l1"><a href="javascript: void(0);">Install Drill</a></li> <ul style="display: none"> <li class="toctree-l2"><a class="reference internal" href="/docs/install-drill-introduction/">Install Drill Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/migrating-parquet-data/">Migrating Parquet Data</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Installing Drill in Embedded Mode</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/embedded-mode-prerequisites/">Embedded Mode Prerequisites</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/running-drill-on-docker/">Running Drill on Docker</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/installing-drill-on-linux-and-mac-os-x/">Installing Drill on Linux and Mac OS X</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/starting-drill-on-linux-and-mac-os-x/">Starting Drill on Linux and Mac OS X</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/installing-drill-on-windows/">Installing Drill on Windows</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/starting-drill-on-windows/">Starting Drill on Windows</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">Installing Drill in Distributed Mode</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/distributed-mode-prerequisites/">Distributed Mode Prerequisites</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/installing-drill-on-the-cluster/">Installing Drill on the Cluster</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/starting-drill-in-distributed-mode/">Starting Drill in Distributed Mode</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/starting-the-web-ui/">Starting the Web UI</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/stopping-drill/">Stopping Drill</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/identifying-multiple-drill-versions-in-a-cluster/">Identifying Multiple Drill Versions in a Cluster</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Extended</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/installing-drill-in-distributed-mode-with-gcp-dataproc/">Installing Drill in Distributed Mode with GCP Dataproc</a></li> </ul> </ul> <li class="toctree-l1"><a href="javascript: void(0);">Configure Drill</a></li> <ul style="display: none"> <li class="toctree-l2"><a class="reference internal" href="/docs/configure-drill-introduction/">Configure Drill Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-drill-memory/">Configuring Drill Memory</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Securing Drill</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/securing-drill-introduction/">Securing Drill Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/secure-communication-paths/">Secure Communication Paths</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/roles-and-privileges/">Roles and Privileges</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-user-impersonation/">Configuring User Impersonation</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-inbound-impersonation/">Configuring Inbound Impersonation</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-user-impersonation-with-hive-authorization/">Configuring User Impersonation with Hive Authorization</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-user-security/">Configuring User Security</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-plain-security/">Configuring Plain Security</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-ssl-tls-for-encryption/">Configuring SSL/TLS for Encryption</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/using-libpam4j-as-the-pam-authenticator/">Using libpam4j as the PAM Authenticator</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/using-jpam-as-the-pam-authenticator/">Using jpam as the PAM Authenticator</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-htpasswd-file-authentication/">Configuring htpasswd file authentication</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-hashicorp-vault-authentication/">Configuring HashiCorp Vault authentication</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-kerberos-security/">Configuring Kerberos Security</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-drill-to-use-spnego-for-http-authentication/">Configuring Drill to use SPNEGO for HTTP Authentication</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-web-ui-and-rest-api-security/">Configuring Web UI and REST API Security</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-custom-acls-to-secure-znodes/">Configuring Custom ACLs to Secure znodes</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">Configuring a Multitenant Cluster</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-a-multitenant-cluster-introduction/">Configuring a Multitenant Cluster Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-multitenant-resources/">Configuring Multitenant Resources</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-resources-for-a-shared-drillbit/">Configuring Resources for a Shared Drillbit</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">Configuration Options</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/configuration-options-introduction/">Configuration Options Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/start-up-options/">Start-Up Options</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/planning-and-execution-options/">Planning and Execution Options</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/persistent-configuration-storage/">Persistent Configuration Storage</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/global-query-list/">Global Query List</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/ports-and-bind-addresses-used-by-drill/">Ports and Bind Addresses Used by Drill</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-the-drill-shell/">Configuring the Drill Shell</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-cgroups-to-control-cpu-usage/">Configuring cgroups to Control CPU Usage</a></li> </ul> <li class="toctree-l1"><a href="javascript: void(0);">Connect a Data Source</a></li> <ul style="display: none"> <li class="toctree-l2"><a class="reference internal" href="/docs/connect-a-data-source-introduction/">Connect a Data Source Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/storage-plugin-registration/">Storage Plugin Registration</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Storage Plugin Configuration</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/plugin-configuration-basics/">Plugin Configuration Basics</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-storage-plugins/">Configuring Storage Plugins</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/storage-plugin-authentication-modes/">Storage plugin authentication modes</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/workspaces/">Workspaces</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/drill-default-input-format/">Drill Default Input Format</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/file-system-storage-plugin/">File System Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/hbase-storage-plugin/">HBase Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/hive-storage-plugin/">Hive Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/rdbms-storage-plugin/">RDBMS Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/mongodb-storage-plugin/">MongoDB Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/mapr-db-format/">MapR-DB Format</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/s3-storage-plugin/">S3 Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/oci-os-storage-plugin/">OCI OS Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/opentsdb-storage-plugin/">OpenTSDB Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/kafka-storage-plugin/">Kafka Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/azure-blob-storage-plugin/">Azure Blob Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/druid-storage-plugin/">Druid Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/http-storage-plugin/">HTTP Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/elasticsearch-storage-plugin/">ElasticSearch Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/splunk-storage-plugin/">Splunk Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/cassandra-storage-plugin/">Cassandra Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/dropbox-storage-plugin/">Dropbox Storage Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/google-sheets-storage-plugin/">Google Sheets Storage Plugin</a></li> </ul> <li class="toctree-l1"><a href="javascript: void(0);">ODBC/JDBC Interfaces</a></li> <ul style="display: none"> <li class="toctree-l2"><a class="reference internal" href="/docs/interfaces-introduction/">Interfaces Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/using-the-jdbc-driver/">Using the JDBC Driver</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/using-jdbc-with-squirrel-on-windows/">Using JDBC with SQuirreL on Windows</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Installing the ODBC Driver</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-linux/">Installing the Driver on Linux</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-mac-os-x/">Installing the Driver on Mac OS X</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-windows/">Installing the Driver on Windows</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">Configuring ODBC</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/odbc-configuration-reference/">ODBC Configuration Reference</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/logging-and-tracing/">Logging and Tracing</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-odbc-on-linux/">Configuring ODBC on Linux</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-odbc-on-mac-os-x/">Configuring ODBC on Mac OS X</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-odbc-on-windows/">Configuring ODBC on Windows</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/testing-the-odbc-connection/">Testing the ODBC Connection</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">Using Drill Explorer</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/drill-explorer-introduction/">Drill Explorer Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/connecting-drill-explorer-to-data/">Connecting Drill Explorer to Data</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/browsing-data-and-defining-views/">Browsing Data and Defining Views</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">Using Drill with BI Tools</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/using-drill-with-bi-tools-introduction/">Using Drill with BI Tools Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/tableau-examples/">Tableau Examples</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/using-microstrategy-analytics-with-apache-drill/">Using MicroStrategy Analytics with Apache Drill</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/using-tibco-spotfire-desktop-with-drill/">Using Tibco Spotfire Desktop with Drill</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-tibco-spotfire-server-with-drill/">Configuring Tibco Spotfire Server with Drill</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/using-qlik-sense-with-drill/">Using Qlik Sense with Drill</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-10-2/">Using Apache Drill with Tableau 10.2</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-9-desktop/">Using Apache Drill with Tableau 9 Desktop</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-9-server/">Using Apache Drill with Tableau 9 Server</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/using-information-builders-webfocus-with-apache-drill/">Using Information Builders’ WebFOCUS with Apache Drill</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-jreport-with-drill/">Configuring JReport with Drill</a></li> </ul> </ul> <li class="toctree-l1 current_section "><a href="javascript: void(0);">Query Data</a></li> <ul class="current_section"> <li class="toctree-l2"><a class="reference internal" href="/docs/query-data-introduction/">Query Data Introduction</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Querying a File System</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/querying-a-file-system-introduction/">Querying a File System Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/querying-avro-files/">Querying Avro Files</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/querying-json-files/">Querying JSON Files</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/querying-parquet-files/">Querying Parquet Files</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/querying-plain-text-files/">Querying Plain Text Files</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/querying-directories/">Querying Directories</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/querying-sequence-files/">Querying Sequence Files</a></li> </ul> <li class="toctree-l2 current"><a class="reference internal" href="/docs/querying-hbase/">Querying HBase</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Querying Complex Data</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/querying-complex-data-introduction/">Querying Complex Data Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/sample-data-donuts/">Sample Data: Donuts</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-flat-data/">Selecting Flat Data</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/using-sql-functions-clauses-and-joins/">Using SQL Functions, Clauses, and Joins</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-nested-data-for-a-column/">Selecting Nested Data for a Column</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-multiple-columns-within-nested-data/">Selecting Multiple Columns Within Nested Data</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/querying-hive/">Querying Hive</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/querying-the-information-schema/">Querying the INFORMATION SCHEMA</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Querying Indexes</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/querying-indexes-introduction/">Querying Indexes Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/queries-that-qualify-for-index-based-query-plans/">Queries that Qualify for Index-Based Query Plans</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/types-of-indexes/">Types of Indexes</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/index-selection/">Index Selection</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/designing-indexes-for-your-queries/">Designing Indexes for Your Queries</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-index-planning/">Configuring Index Planning</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/verifying-index-use/">Verifying Index Use</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/querying-system-tables/">Querying System Tables</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/monitoring-and-canceling-queries-in-the-drill-web-ui/">Monitoring and Canceling Queries in the Drill Web UI</a></li> </ul> <li class="toctree-l1"><a href="javascript: void(0);">Performance Tuning</a></li> <ul style="display: none"> <li class="toctree-l2"><a href="javascript: void(0);">Drill Metastore</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/using-drill-metastore/">Using Drill Metastore</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/drill-iceberg-metastore/">Drill Iceberg Metastore</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/rdbms-metastore/">RDBMS Metastore</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/mongo-metastore/">Mongo Metastore</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/performance-tuning-introduction/">Performance Tuning Introduction</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Partition Pruning</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/partition-pruning-introduction/">Partition Pruning Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/how-to-partition-data/">How to Partition Data</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/asynchronous-parquet-reader/">Asynchronous Parquet Reader</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/optimizing-parquet-metadata-reading/">Optimizing Parquet Metadata Reading</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/parquet-filter-pushdown/">Parquet Filter Pushdown</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/hive-metadata-caching/">Hive Metadata Caching</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/choosing-a-storage-format/">Choosing a Storage Format</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Query Plans and Tuning</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/query-plans-and-tuning-introduction/">Query Plans and Tuning Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/join-planning-guidelines/">Join Planning Guidelines</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/guidelines-for-optimizing-aggregation/">Guidelines for Optimizing Aggregation</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/modifying-query-planning-options/">Modifying Query Planning Options</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/sort-based-and-hash-based-memory-constrained-operators/">Sort-Based and Hash-Based Memory-Constrained Operators</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">Identifying Performance Issues</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/query-plans/">Query Plans</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/query-profiles/">Query Profiles</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">Performance Tuning Reference</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/query-profile-column-descriptions/">Query Profile Column Descriptions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/physical-operators/">Physical Operators</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/monitoring-metrics/">Monitoring Metrics</a></li> </ul> <li class="toctree-l1"><a href="javascript: void(0);">Log and Debug</a></li> <ul style="display: none"> <li class="toctree-l2"><a class="reference internal" href="/docs/log-and-debug-introduction/">Log and Debug Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/error-messages/">Error Messages</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/modify-logback-xml/">Modify logback.xml</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/review-the-java-stack-trace/">Review the Java Stack Trace</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/query-audit-logging/">Query Audit Logging</a></li> </ul> <li class="toctree-l1"><a href="javascript: void(0);">SQL Reference</a></li> <ul style="display: none"> <li class="toctree-l2"><a class="reference internal" href="/docs/sql-reference-introduction/">SQL Reference Introduction</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Data Types</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/supported-data-types/">Supported Data Types</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/date-time-and-timestamp/">Date, Time, and Timestamp</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/handling-different-data-types/">Handling Different Data Types</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/lexical-structure/">Lexical Structure</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/operators/">Operators</a></li> <li class="toctree-l2"><a href="javascript: void(0);">SQL Functions</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/about-sql-function-examples/">About SQL Function Examples</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/math-and-trig/">Math and Trig</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/statistical/">Statistical</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/data-type-conversion/">Data Type Conversion</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/data-type-functions/">Data Type Functions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/date-time-functions-and-arithmetic/">Date/Time Functions and Arithmetic</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/string-manipulation/">String Manipulation</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/aggregate-and-aggregate-statistical/">Aggregate and Aggregate Statistical</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/functions-for-handling-nulls/">Functions for Handling Nulls</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/phonetic-functions/">Phonetic Functions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/string-distance-functions/">String Distance Functions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/cryptography-functions/">Cryptography Functions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/sql-dialect-compatibility-functions/">SQL dialect compatibility functions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/gis-functions/">GIS functions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/time-series-analysis-functions/">Time Series Analysis Functions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/ip-networking-functions/">IP Networking functions</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">SQL Window Functions</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/sql-window-functions-introduction/">SQL Window Functions Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/aggregate-window-functions/">Aggregate Window Functions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/ranking-window-functions/">Ranking Window Functions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/value-window-functions/">Value Window Functions</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/sql-window-functions-examples/">SQL Window Functions Examples</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">Nested Data Functions</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/nested-data-limitations/">Nested Data Limitations</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/flatten/">FLATTEN</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/kvgen/">KVGEN</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/repeated-count/">REPEATED_COUNT</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/repeated-contains/">REPEATED_CONTAINS</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/list-creation-functions/">COLLECT_LIST</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/query-directory-functions/">Query Directory Functions</a></li> <li class="toctree-l2"><a href="javascript: void(0);">SQL Commands</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/supported-sql-commands/">Supported SQL Commands</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/analyze-table-refresh-metadata/">ANALYZE TABLE REFRESH METADATA</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/analyze-table-compute-statistics/">ANALYZE TABLE COMPUTE STATISTICS</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/set/">SET</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/refresh-table-metadata/">REFRESH TABLE METADATA</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/reset/">RESET</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/alter-system/">ALTER SYSTEM</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/create-or-replace-schema/">CREATE OR REPLACE SCHEMA</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/create-table-as-ctas/">CREATE TABLE AS (CTAS)</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/create-temporary-table-as-cttas/">CREATE TEMPORARY TABLE AS (CTTAS)</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/create-function-using-jar/">CREATE FUNCTION USING JAR</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/partition-by-clause/">PARTITION BY Clause</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/create-view/">CREATE VIEW</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/describe/">DESCRIBE</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/drop-function-using-jar/">DROP FUNCTION USING JAR</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/drop-table/">DROP TABLE</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/drop-view/">DROP VIEW</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/explain/">EXPLAIN</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/lateral-join/">LATERAL Join</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/select/">SELECT</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/select-list/">SELECT List</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/from-clause/">FROM Clause</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/group-by-clause/">GROUP BY Clause</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/having-clause/">HAVING Clause</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/limit-clause/">LIMIT Clause</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/offset-clause/">OFFSET Clause</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/order-by-clause/">ORDER BY Clause</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/set-operators/">Set Operators</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/where-clause/">WHERE Clause</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/with-clause/">WITH Clause</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/show-databases-and-show-schemas/">SHOW DATABASES and SHOW SCHEMAS</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/show-files/">SHOW FILES</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/show-tables/">SHOW TABLES</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/use/">USE</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/pivot-operators/">Pivot Operators</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">SQL Conditional Expressions</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/case/">CASE</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/reserved-keywords/">Reserved Keywords</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/sql-extensions/">SQL Extensions</a></li> </ul> <li class="toctree-l1"><a href="javascript: void(0);">Data Sources and File Formats</a></li> <ul style="display: none"> <li class="toctree-l2"><a class="reference internal" href="/docs/data-sources-and-file-formats-introduction/">Data Sources and File Formats Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/hive-to-drill-data-type-mapping/">Hive-to-Drill Data Type Mapping</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/deploying-and-using-a-hive-udf/">Deploying and Using a Hive UDF</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/parquet-format/">Parquet Format</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/logfile-plugin/">Logfile Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/json-data-model/">JSON Data Model</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/text-files-csv-tsv-psv/">Text Files: CSV, TSV, PSV</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/sequence-files/">Sequence Files</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/httpd-format-plugin/">HTTPD Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/image-metadata-format-plugin/">Image Metadata Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/syslog-format-plugin/">Syslog Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/ltsv-format-plugin/">LTSV Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/spss-format-plugin/">SPSS Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/esri-shapefile-format-plugin/">ESRI Shapefile Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/excel-format-plugin/">Excel Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/hdf5-format-plugin/">HDF5 Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/ms-access-format-plugin/">Microsoft Access Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/xml-format-plugin/">XML Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/iceberg-format-plugin/">Iceberg Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/delta-lake-format-plugin/">Delta Lake Format Plugin</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/sas-format-plugin/">SAS Format Plugin</a></li> </ul> <li class="toctree-l1"><a href="javascript: void(0);">Develop Custom Functions</a></li> <ul style="display: none"> <li class="toctree-l2"><a class="reference internal" href="/docs/develop-custom-functions-introduction/">Develop Custom Functions Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/developing-a-simple-function/">Developing a Simple Function</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/tutorial-develop-a-simple-function/">Tutorial: Develop a Simple Function</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/developing-an-aggregate-function/">Developing an Aggregate Function</a></li> <li class="toctree-l2"><a href="javascript: void(0);">Adding Custom Functions to Drill</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/adding-custom-functions-to-drill-introduction/">Adding Custom Functions to Drill Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/manually-adding-custom-functions-to-drill/">Manually Adding Custom Functions to Drill</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/creating-custom-authenticators/">Creating Custom Authenticators</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/dynamic-udfs/">Dynamic UDFs</a></li> </ul> <li class="toctree-l2"><a class="reference internal" href="/docs/using-custom-functions-in-queries/">Using Custom Functions in Queries</a></li> <li class="toctree-l2"><a class="reference internal" href="/docs/custom-function-interfaces/">Custom Function Interfaces</a></li> </ul> <li class="toctree-l1"><a class="reference internal" href="/docs/troubleshooting/">Troubleshooting</a></li> <li class="toctree-l1"><a href="javascript: void(0);">Developer Information</a></li> <ul style="display: none"> <li class="toctree-l2"><a href="javascript: void(0);">REST API</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/rest-api-introduction/">REST API Introduction</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/submitting-queries-from-the-rest-api-when-impersonation-is-enabled-and-authentication-is-disabled/">Submitting Queries from the REST API when Impersonation is Enabled and Authentication is Disabled</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/use-postman-to-run-sql-queries-on-drill-data-sources/">Use Postman to Run SQL Queries on Drill Data Sources</a></li> </ul> <li class="toctree-l2"><a href="javascript: void(0);">Develop Drill</a></li> <ul style="display: none"> <li class="toctree-l3"><a class="reference internal" href="/docs/compiling-drill-from-source/">Compiling Drill from Source</a></li> <li class="toctree-l3"><a class="reference internal" href="/docs/useful-information-for-drill-developers/">Useful Information for Drill Developers</a></li> </ul> <li class="toctree-l2"><a href="javascript: 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href="https://github.com/apache/drill-site/blob/master/_docs/en/query-data/030-querying-hbase.md" target="_blank"><i class="fa fa-pencil-square-o"></i></a> <div class="int_title left"> <h1>Querying HBase</h1> </div> <!-- jt: we don't need to display a last-modified date on each page to users --> <div class="int_text" align="left"> <p>This section covers the following topics:</p> <ul> <li><a href="/docs/querying-hbase/#tutorial-querying-hbase-data">Tutorial–Querying HBase Data</a> A simple tutorial that shows how to use Drill to query HBase data.</li> <li><a href="/docs/querying-hbase/#working-with-hbase-byte-arrays">Working with HBase Byte Arrays</a> How to work with HBase byte arrays for serious applications</li> <li><a href="/docs/querying-hbase/#querying-big-endian-encoded-data">Querying Big Endian-Encoded Data</a> How to use optimization features in Drill 1.2 and later</li> <li><a href="/docs/querying-hbase/#leveraging-hbase-ordered-byte-encoding">Leveraging HBase Ordered Byte Encoding</a> How to use Drill 1.2 to leverage new features introduced by <a href="https://issues.apache.org/jira/browse/HBASE-8201">HBASE-8201 Jira</a></li> </ul> <h2 id="tutorialquerying-hbase-data">Tutorial–Querying HBase Data</h2> <p>This tutorial shows how to connect Drill to an HBase data source, create simple HBase tables, and query the data using Drill.</p> <hr /> <h3 id="configure-the-hbase-storage-plugin">Configure the HBase Storage Plugin</h3> <p>To query an HBase data source using Drill, first configure the <a href="/docs/hbase-storage-plugin/">HBase storage plugin</a> for your environment.</p> <hr /> <h3 id="create-the-hbase-tables">Create the HBase tables</h3> <p>You create two tables in HBase, students and clicks, that you can query with Drill. You use the CONVERT_TO and CONVERT_FROM functions to convert binary text to/from typed data. You use the CAST function to convert the binary data to an INT in step 4 of <a href="/docs/querying-hbase/#query-hbase-tables">Query HBase Tables</a>. When converting an INT or BIGINT number, having a byte count in the destination/source that does not match the byte count of the number in the binary source/destination, use CAST.</p> <p>To create the HBase tables, complete the following steps:</p> <ol> <li> <p>Pipe the following commands to the HBase shell to create students and clicks tables in HBase:</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> echo "create 'students','account','address'" | hbase shell echo "create 'clicks','clickinfo','iteminfo'" | hbase shell </code></pre></div> </div> </li> <li> <p>Issue the following command to create a <code class="language-plaintext highlighter-rouge">testdata.txt</code> file:</p> <p><code class="language-plaintext highlighter-rouge">cat &gt; testdata.txt</code></p> </li> <li> <p>Copy and paste the following <code class="language-plaintext highlighter-rouge">put</code> commands on the line below the <strong>cat</strong> command. Press Return, and then CTRL Z to close the file.</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> put 'students','student1','account:name','Alice' put 'students','student1','address:street','123 Ballmer Av' put 'students','student1','address:zipcode','12345' put 'students','student1','address:state','CA' put 'students','student2','account:name','Bob' put 'students','student2','address:street','1 Infinite Loop' put 'students','student2','address:zipcode','12345' put 'students','student2','address:state','CA' put 'students','student3','account:name','Frank' put 'students','student3','address:street','435 Walker Ct' put 'students','student3','address:zipcode','12345' put 'students','student3','address:state','CA' put 'students','student4','account:name','Mary' put 'students','student4','address:street','56 Southern Pkwy' put 'students','student4','address:zipcode','12345' put 'students','student4','address:state','CA' put 'clicks','click1','clickinfo:studentid','student1' put 'clicks','click1','clickinfo:url','http://www.google.com' put 'clicks','click1','clickinfo:time','2014-01-01 12:01:01.0001' put 'clicks','click1','iteminfo:itemtype','image' put 'clicks','click1','iteminfo:quantity','1' put 'clicks','click2','clickinfo:studentid','student1' put 'clicks','click2','clickinfo:url','http://www.amazon.com' put 'clicks','click2','clickinfo:time','2014-01-01 01:01:01.0001' put 'clicks','click2','iteminfo:itemtype','image' put 'clicks','click2','iteminfo:quantity','1' put 'clicks','click3','clickinfo:studentid','student2' put 'clicks','click3','clickinfo:url','http://www.google.com' put 'clicks','click3','clickinfo:time','2014-01-01 01:02:01.0001' put 'clicks','click3','iteminfo:itemtype','text' put 'clicks','click3','iteminfo:quantity','2' put 'clicks','click4','clickinfo:studentid','student2' put 'clicks','click4','clickinfo:url','http://www.ask.com' put 'clicks','click4','clickinfo:time','2013-02-01 12:01:01.0001' put 'clicks','click4','iteminfo:itemtype','text' put 'clicks','click4','iteminfo:quantity','5' put 'clicks','click5','clickinfo:studentid','student2' put 'clicks','click5','clickinfo:url','http://www.reuters.com' put 'clicks','click5','clickinfo:time','2013-02-01 12:01:01.0001' put 'clicks','click5','iteminfo:itemtype','text' put 'clicks','click5','iteminfo:quantity','100' put 'clicks','click6','clickinfo:studentid','student3' put 'clicks','click6','clickinfo:url','http://www.google.com' put 'clicks','click6','clickinfo:time','2013-02-01 12:01:01.0001' put 'clicks','click6','iteminfo:itemtype','image' put 'clicks','click6','iteminfo:quantity','1' put 'clicks','click7','clickinfo:studentid','student3' put 'clicks','click7','clickinfo:url','http://www.ask.com' put 'clicks','click7','clickinfo:time','2013-02-01 12:45:01.0001' put 'clicks','click7','iteminfo:itemtype','image' put 'clicks','click7','iteminfo:quantity','10' put 'clicks','click8','clickinfo:studentid','student4' put 'clicks','click8','clickinfo:url','http://www.amazon.com' put 'clicks','click8','clickinfo:time','2013-02-01 22:01:01.0001' put 'clicks','click8','iteminfo:itemtype','image' put 'clicks','click8','iteminfo:quantity','1' put 'clicks','click9','clickinfo:studentid','student4' put 'clicks','click9','clickinfo:url','http://www.amazon.com' put 'clicks','click9','clickinfo:time','2013-02-01 22:01:01.0001' put 'clicks','click9','iteminfo:itemtype','image' put 'clicks','click9','iteminfo:quantity','10' </code></pre></div> </div> </li> <li> <p>Issue the following command to put the data into HBase:</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> cat testdata.txt | hbase shell </code></pre></div> </div> </li> </ol> <hr /> <h3 id="query-hbase-tables">Query HBase Tables</h3> <p><a href="/docs/installing-drill-in-embedded-mode/">Start Drill</a> and complete the following steps to query the HBase tables you created.</p> <ol> <li>Use the HBase storage plugin configuration. <code class="language-plaintext highlighter-rouge">USE hbase;</code></li> <li> <p>Issue the following query to see the data in the students table: <code class="language-plaintext highlighter-rouge">SELECT * FROM students;</code></p> <p>The query returns results that are not useable. In the next step, you convert the data from byte arrays to UTF8 types that are meaningful.</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> |-------------|-----------------------|---------------------------------------------------------------------------| | row_key | account | address | |-------------|-----------------------|---------------------------------------------------------------------------| | [B@e6d9eb7 | {"name":"QWxpY2U="} | {"state":"Q0E=","street":"MTIzIEJhbGxtZXIgQXY=","zipcode":"MTIzNDU="} | | [B@2823a2b4 | {"name":"Qm9i"} | {"state":"Q0E=","street":"MSBJbmZpbml0ZSBMb29w","zipcode":"MTIzNDU="} | | [B@3b8eec02 | {"name":"RnJhbms="} | {"state":"Q0E=","street":"NDM1IFdhbGtlciBDdA==","zipcode":"MTIzNDU="} | | [B@242895da | {"name":"TWFyeQ=="} | {"state":"Q0E=","street":"NTYgU291dGhlcm4gUGt3eQ==","zipcode":"MTIzNDU="} | |-------------|-----------------------|---------------------------------------------------------------------------| 4 rows selected (1.335 seconds) </code></pre></div> </div> </li> <li> <p>Issue the following query, that includes the CONVERT_FROM function, to convert the <code class="language-plaintext highlighter-rouge">students</code> table to typed data:</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> SELECT CONVERT_FROM(row_key, 'UTF8') AS studentid, CONVERT_FROM(students.account.name, 'UTF8') AS name, CONVERT_FROM(students.address.state, 'UTF8') AS state, CONVERT_FROM(students.address.street, 'UTF8') AS street, CONVERT_FROM(students.address.zipcode, 'UTF8') AS zipcode FROM students; </code></pre></div> </div> <div class="admonition note"> </div> </li> </ol> <p class="first admonition-title">Note</p> <p class="last">Use dot notation to drill down to a column in an HBase table: tablename.columnfamilyname.columnnname </p> <p>&lt;/div&gt;</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>The query returns results that look much better: |------------|------------|------------|------------------|------------| | studentid | name | state | street | zipcode | |------------|------------|------------|------------------|------------| | student1 | Alice | CA | 123 Ballmer Av | 12345 | | student2 | Bob | CA | 1 Infinite Loop | 12345 | | student3 | Frank | CA | 435 Walker Ct | 12345 | | student4 | Mary | CA | 56 Southern Pkwy | 12345 | |------------|------------|------------|------------------|------------| 4 rows selected (0.504 seconds) </code></pre></div></div> <ol> <li> <p>Query the clicks table to see which students visited google.com:</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> SELECT CONVERT_FROM(row_key, 'UTF8') AS clickid, CONVERT_FROM(clicks.clickinfo.studentid, 'UTF8') AS studentid, CONVERT_FROM(clicks.clickinfo.`time`, 'UTF8') AS `time`, CONVERT_FROM(clicks.clickinfo.url, 'UTF8') AS url FROM clicks WHERE clicks.clickinfo.url LIKE '%google%'; |------------|------------|--------------------------|-----------------------| | clickid | studentid | time | url | |------------|------------|--------------------------|-----------------------| | click1 | student1 | 2014-01-01 12:01:01.0001 | http://www.google.com | | click3 | student2 | 2014-01-01 01:02:01.0001 | http://www.google.com | | click6 | student3 | 2013-02-01 12:01:01.0001 | http://www.google.com | |------------|------------|--------------------------|-----------------------| 3 rows selected (0.294 seconds) </code></pre></div> </div> </li> <li> <p>Query the clicks table to get the studentid of the student having 100 items. Use CONVERT_FROM to convert the textual studentid and itemtype data, but use CAST to convert the integer quantity.</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> SELECT CONVERT_FROM(tbl.clickinfo.studentid, 'UTF8') AS studentid, CONVERT_FROM(tbl.iteminfo.itemtype, 'UTF8'), CAST(tbl.iteminfo.quantity AS INT) AS items FROM clicks tbl WHERE tbl.iteminfo.quantity=100; |------------|------------|------------| | studentid | EXPR$1 | items | |------------|------------|------------| | student2 | text | 100 | |------------|------------|------------| 1 row selected (0.656 seconds) </code></pre></div> </div> </li> </ol> <h2 id="working-with-hbase-byte-arrays">Working with HBase Byte Arrays</h2> <p>The trivial example in the previous section queried little endian-encoded data in HBase. For serious applications, you need to understand how to work with HBase byte arrays. If you want Drill to interpret the underlying HBase row key as something other than a byte array, you need to know the encoding of the data in HBase. By default, HBase stores data in little endian and Drill assumes the data is little endian, which is unsorted. The following table shows the sorting of typical row key IDs in bytes, encoded in little endian and big endian, respectively:</p> <table> <thead> <tr> <th>IDs in Byte Notation Little Endian Sorting</th> <th>IDs in Decimal Notation</th> <th>IDs in Byte Notation Big Endian Sorting</th> <th>IDs in Decimal Notation</th> </tr> </thead> <tbody> <tr> <td>0 x 010000 . . . 000</td> <td>1</td> <td>0 x 00000001</td> <td>1</td> </tr> <tr> <td>0 x 010100 . . . 000</td> <td>17</td> <td>0 x 00000002</td> <td>2</td> </tr> <tr> <td>0 x 020000 . . . 000</td> <td>2</td> <td>0 x 00000003</td> <td>3</td> </tr> <tr> <td>. . .</td> <td> </td> <td>0 x 00000004</td> <td>4</td> </tr> <tr> <td>0 x 050000 . . . 000</td> <td>5</td> <td>0 x 00000005</td> <td>5</td> </tr> <tr> <td>. . .</td> <td> </td> <td>. . .</td> <td> </td> </tr> <tr> <td>0 x 0A0000 . . . 000</td> <td>10</td> <td>0 x 0000000A</td> <td>10</td> </tr> <tr> <td> </td> <td> </td> <td>0 x 00000101</td> <td>17</td> </tr> </tbody> </table> <h2 id="querying-big-endian-encoded-data">Querying Big Endian-Encoded Data</h2> <p>Drill optimizes scans of HBase tables when you use the <a href="/docs/supported-data-types/#data-types-for-convert_to-and-convert_from-functions">“CONVERT_TO and CONVERT_FROM data types”</a> on big endian-encoded data. Drill provides the *_BE encoded types for use with CONVERT_TO and CONVERT_FROM to take advantage of these optimizations. Here are a few examples of the *_BE types.</p> <ul> <li>DATE_EPOCH_BE</li> <li>TIME_EPOCH_BE</li> <li>TIMESTAMP_EPOCH_BE</li> <li>UINT8_BE</li> <li>BIGINT_BE</li> </ul> <p>For example, Drill returns results performantly when you use the following query on big endian-encoded data:</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>SELECT CONVERT_FROM(BYTE_SUBSTR(row_key, 1, 8), 'DATE_EPOCH_BE') d, CONVERT_FROM(BYTE_SUBSTR(row_key, 9, 8), 'BIGINT_BE') id, CONVERT_FROM(tableName.f.c, 'UTF8') FROM hbase.`TestTableCompositeDate` tableName WHERE CONVERT_FROM(BYTE_SUBSTR(row_key, 1, 8), 'DATE_EPOCH_BE') &lt; DATE '2015-06-18' AND CONVERT_FROM(BYTE_SUBSTR(row_key, 1, 8), 'DATE_EPOCH_BE') &gt; DATE '2015-06-13'; </code></pre></div></div> <p>This query assumes that the row key of the table represents the DATE_EPOCH type encoded in big-endian format. The Drill HBase plugin will be able to prune the scan range since there is a condition on the big endian-encoded prefix of the row key. For more examples, see the <a href="https://github.com/apache/drill/blob/95623912ebf348962fe8a8846c5f47c5fdcf2f78/contrib/storage-hbase/src/test/java/org/apache/drill/hbase/TestHBaseFilterPushDown.java">test code</a>.</p> <p>To query HBase data:</p> <ol> <li> <p>Connect the data source to Drill using the <a href="/docs/hbase-storage-plugin/">HBase storage plugin</a>.</p> <p><code class="language-plaintext highlighter-rouge">USE hbase;</code></p> </li> <li>Determine the encoding of the HBase data you want to query. Ask the person in charge of creating the data.</li> <li> <p>Based on the encoding type of the data, use the <a href="/docs/supported-data-types/#data-types-for-convert_to-and-convert_from-functions">“CONVERT_TO and CONVERT_FROM data types”</a> to convert HBase binary representations to an SQL type as you query the data. For example, use CONVERT_FROM in your Drill query to convert a big endian-encoded row key to an SQL BIGINT type:</p> <p><code class="language-plaintext highlighter-rouge">SELECT CONVERT_FROM(BYTE_SUBSTR(row_key, 1, 8),'BIGINT_BE’) FROM my_hbase_table;</code></p> </li> </ol> <p>The <a href="/docs/string-manipulation/#byte_substr">BYTE_SUBSTR function</a> separates parts of a HBase composite key in this example. The Drill optimization is based on the capability in Drill 1.2 and later to push conditional filters down to the storage layer when HBase data is in big endian format.</p> <p>Drill can performantly query HBase data that uses composite keys, as shown in the last example, if only the first component of the composite is encoded in big endian format. If the HBase row key is not stored in big endian, do not use the *_BE types. If you want to convert a little endian byte array to integer, use BIGINT instead of BIGINT_BE, for example, as an argument to CONVERT_FROM.</p> <h2 id="leveraging-hbase-ordered-byte-encoding">Leveraging HBase Ordered Byte Encoding</h2> <p>Drill 1.2 leverages new features introduced by <a href="https://issues.apache.org/jira/browse/HBASE-8201">HBASE-8201 Jira</a> that allows ordered byte encoding of different data types. This encoding scheme preserves the sort order of the native data type when the data is stored as sorted byte arrays on disk. Thus, Drill will be able to process data through the HBase storage plugin if the row keys have been encoded in OrderedBytes format.</p> <p>To execute the following query, Drill prunes the scan range to only include the row keys representing [-32,59] range, thus reducing the amount of data read.</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>SELECT CONVERT_FROM(t.row_key, 'INT_OB') rk, CONVERT_FROM(t.`f`.`c`, 'UTF8') val FROM hbase.`TestTableIntOB` t WHERE CONVERT_FROM(row_key, 'INT_OB') &gt;= cast(-32 as INT) AND CONVERT_FROM(row_key, 'INT_OB') &lt; cast(59 as INT); </code></pre></div></div> <p>For more examples, see the <a href="https://github.com/apache/drill/blob/95623912ebf348962fe8a8846c5f47c5fdcf2f78/contrib/storage-hbase/src/test/java/org/apache/drill/hbase/TestHBaseFilterPushDown.java">test code</a>.</p> <p>By taking advantage of ordered byte encoding, Drill 1.2 and later can performantly execute conditional queries without a secondary index on HBase big endian data.</p> <div class="doc-nav"> <span class="previous-toc"><a href="/docs/querying-a-file-system/">← Querying a File System</a></span><span class="next-toc"><a href="/docs/querying-complex-data/">Querying Complex Data →</a></span> </div> </div> </div> </div> </div> <p class="push"></p> <div id="footer" class="mw"> <div class="wrapper"> Copyright © 2012-2022 The Apache Software Foundation, licensed under the Apache License, Version 2.0.<br> Apache and the Apache feather logo are trademarks of The Apache Software Foundation. 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