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</head> + <body onResize="resized();"> <div class="page-wrap"> <div class="bui"></div> @@ -63,6 +58,12 @@ <li><a href="/docs/query-data/">Query Data</a></li> + <li><a href="/docs/performance-tuning/">Performance Tuning</a></li> + + <li><a href="/docs/log-and-debug/">Log and Debug</a></li> + + <li><a href="/docs/query-audit-logging/">Query Audit Logging</a></li> + <li><a href="/docs/sql-reference/">SQL Reference</a></li> <li><a href="/docs/data-sources-and-file-formats/">Data Sources and File Formats</a></li> @@ -81,6 +82,8 @@ <li><a href="/docs/project-bylaws/">Project Bylaws</a></li> + <li><a href="/docs/log-and-debug/">Log and Debug</a></li> + </ul> </li> <li class='nav'> @@ -110,7 +113,9 @@ </ul> </div> - + <link href="/css/content.css" rel="stylesheet" type="text/css"> + + @@ -149,14 +154,7 @@ - <li class="toctree-l2"><a href="javascript: void(0);">Architectural Highlights</a></li> - <ul style="display: none"> - - <li class="toctree-l3"><a class="reference internal" href="/docs/flexibility/">Flexibility</a></li> - - <li class="toctree-l3"><a class="reference internal" href="/docs/performance/">Performance</a></li> - - </ul> + <li class="toctree-l2"><a class="reference internal" href="/docs/performance/">Performance</a></li> </ul> @@ -203,6 +201,10 @@ <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> + + </ul> @@ -300,7 +302,7 @@ - <li class="toctree-l2"><a class="reference internal" href="/docs/partition-pruning/">Partition Pruning</a></li> + <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-the-drill-shell/">Configuring the Drill Shell</a></li> </ul> @@ -357,7 +359,7 @@ - <li class="toctree-l2"><a class="reference internal" href="/docs/using-jdbc/">Using JDBC</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> @@ -409,6 +411,10 @@ + <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-tibco-spotfire-server-with-drill/">Configuring Tibco Spotfire Server with Drill</a></li> + + + <li class="toctree-l2"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-9-desktop/">Using Apache Drill with Tableau 9 Desktop</a></li> @@ -487,6 +493,32 @@ + <li class="toctree-l1"><a href="javascript: void(0);">Performance Tuning</a></li> + <ul style="display: none"> + + + <li class="toctree-l2"><a class="reference internal" href="/docs/performance-tuning-introduction/">Performance Tuning Introduction</a></li> + + + </ul> + + + + <li class="toctree-l1"><a class="reference internal" href="/docs/log-and-debug/">Log and Debug</a></li> + + + + <li class="toctree-l1"><a href="javascript: void(0);">Query Audit Logging</a></li> + <ul style="display: none"> + + + <li class="toctree-l2"><a class="reference internal" href="/docs/getting-query-information/">Getting Query Information</a></li> + + + </ul> + + + <li class="toctree-l1 current_section "><a href="javascript: void(0);">SQL Reference</a></li> <ul class="current_section"> @@ -563,27 +595,47 @@ <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/alter-session-command/">ALTER SESSION Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/alter-session/">ALTER SESSION</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-table-as-ctas/">CREATE TABLE AS (CTAS)</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/drop-view/">DROP 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/explain/">EXPLAIN</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-from/">SELECT FROM</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-group-by/">SELECT GROUP BY</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/alter-system-command/">ALTER SYSTEM Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-having/">SELECT HAVING</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/create-table-as-ctas-command/">CREATE TABLE AS (CTAS) Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-limit/">SELECT LIMIT</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/create-view-command/">CREATE VIEW Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-offset/">SELECT OFFSET</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/describe-command/">DESCRIBE Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-order-by/">SELECT ORDER BY</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/explain-commands/">EXPLAIN Commands</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-union/">SELECT UNION</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/select-statements/">SELECT Statements</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-where/">SELECT WHERE</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/show-databases-and-show-schemas-command/">SHOW DATABASES and SHOW SCHEMAS Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-with/">SELECT WITH</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/show-files-command/">SHOW FILES Command</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-tables-command/">SHOW TABLES Command</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/use-command/">USE Command</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> </ul> @@ -782,6 +834,10 @@ <li class="toctree-l2"><a class="reference internal" href="/docs/what-is-apache-drill/">What is Apache Drill</a></li> + + <li class="toctree-l2"><a class="reference internal" href="/docs/partition-pruning/">Partition Pruning</a></li> + + </ul> @@ -800,6 +856,29 @@ <li class="toctree-l1"><a class="reference internal" href="/docs/project-bylaws/">Project Bylaws</a></li> + + <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> + + + </ul> + + </ul> </div> @@ -807,7 +886,7 @@ </aside> - <nav class="breadcrumbs"> +<nav class="breadcrumbs"> <li><a href="/docs/">Docs</a></li> @@ -818,23 +897,23 @@ <li>Functions for Handling Nulls</li> </nav> - <div class="main-content-wrapper"> - <div class="main-content"> +<div class="main-content-wrapper"> + <div class="main-content"> - - <a class="edit-link" href="https://github.com/apache/drill/blob/gh-pages/_docs/sql-reference/sql-functions/060-functions-for-handling-nulls.md"; target="_blank"><i class="fa fa-pencil-square-o"></i></a> - + + <a class="edit-link" href="https://github.com/apache/drill/blob/gh-pages/_docs/sql-reference/sql-functions/060-functions-for-handling-nulls.md"; target="_blank"><i class="fa fa-pencil-square-o"></i></a> + - <div class="int_title"> - <h1>Functions for Handling Nulls</h1> + <div class="int_title left"> + <h1>Functions for Handling Nulls</h1> - </div> + </div> - <link href="/css/docpage.css" rel="stylesheet" type="text/css"> + <link href="/css/docpage.css" rel="stylesheet" type="text/css"> - <div class="int_text" align="left"> - - <p>Drill supports the following functions for handling nulls:</p> + <div class="int_text" align="left"> + + <p>Drill supports the following functions for handling nulls:</p> <ul> <li>COALESCE</li> @@ -888,17 +967,17 @@ SELECT NULLIF(d9, d9) FROM alltypes limit 1; | EXPR$0 | +------------+ </code></pre></div> + - - <div class="doc-nav"> + <div class="doc-nav"> <span class="previous-toc"><a href="/docs/aggregate-and-aggregate-statistical/">â Aggregate and Aggregate Statistical</a></span><span class="next-toc"><a href="/docs/nested-data-functions/">Nested Data Functions â</a></span> </div> - - </div> + </div> </div> +</div> </div> <p class="push"></p>
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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 class="reference internal" href="/docs/configuring-user-impersonation/">Configuring User Impersonation</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-user-authentication/">Configuring User Authentication</a></li> + + + + <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> + + </ul> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/ports-used-by-drill/">Ports 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> + + + </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-introduction/">Plugin Configuration Introduction</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/file-system-storage-plugin/">File System Storage Plugin</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/hbase-storage-plugin/">HBase Storage Plugin</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/hive-storage-plugin/">Hive Storage Plugin</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/mongodb-plugin-for-apache-drill/">MongoDB Plugin for Apache Drill</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/mapr-db-format/">MapR-DB Format</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-jdbc-with-squirrel-on-windows/">Using JDBC with SQuirreL on Windows</a></li> + + + + <li class="toctree-l2"><a href="javascript: void(0);">Using ODBC on Linux and Mac OS X</a></li> + <ul style="display: none"> + + <li class="toctree-l3"><a class="reference internal" href="/docs/odbc-on-linux-and-mac-introduction/">ODBC on Linux and Mac Introduction</a></li> + + <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/configuring-connections-on-linux-and-mac-os-x/">Configuring Connections on Linux and Mac OS X</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/driver-configuration-options/">Driver Configuration Options</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/using-a-connection-string/">Using a Connection String</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/advanced-properties/">Advanced Properties</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 ODBC on Windows</a></li> + <ul style="display: none"> + + <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-windows/">Installing the Driver on Windows</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-connections-on-windows/">Configuring Connections on Windows</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/connecting-to-odbc-data-sources/">Connecting to ODBC Data Sources</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-drill-explorer-on-windows/">Using Drill Explorer on Windows</a></li> + + </ul> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/using-microstrategy-analytics-with-apache-drill/">Using MicroStrategy Analytics with Apache Drill</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/using-tibco-spotfire-with-drill/">Using Tibco Spotfire with Drill</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-tibco-spotfire-server-with-drill/">Configuring Tibco Spotfire Server with Drill</a></li> + + + + <li class="toctree-l2"><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-l2"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-9-server/">Using Apache Drill with Tableau 9 Server</a></li> + + + </ul> + + + + <li class="toctree-l1"><a href="javascript: void(0);">Query Data</a></li> + <ul style="display: none"> + + + <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-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> + + </ul> + + + + <li class="toctree-l2"><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 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 class="reference internal" href="/docs/performance-tuning-introduction/">Performance Tuning Introduction</a></li> + + + </ul> + + + + <li class="toctree-l1"><a class="reference internal" href="/docs/log-and-debug/">Log and Debug</a></li> + + + + <li class="toctree-l1 current_section "><a href="javascript: void(0);">Query Audit Logging</a></li> + <ul class="current_section"> + + + <li class="toctree-l2 current"><a class="reference internal" href="/docs/getting-query-information/">Getting Query Information</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/data-type-conversion/">Data Type Conversion</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> + + </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> + + </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/alter-session/">ALTER SESSION</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-table-as-ctas/">CREATE TABLE AS (CTAS)</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/drop-view/">DROP 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/explain/">EXPLAIN</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-from/">SELECT FROM</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-group-by/">SELECT GROUP BY</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-having/">SELECT HAVING</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-limit/">SELECT LIMIT</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-offset/">SELECT OFFSET</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-order-by/">SELECT ORDER BY</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-union/">SELECT UNION</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-where/">SELECT WHERE</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-with/">SELECT WITH</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> + + </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/json-data-model/">JSON Data Model</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/develop-a-simple-function/">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 class="reference internal" href="/docs/adding-custom-functions-to-drill/">Adding Custom Functions to Drill</a></li> + + + + <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 href="javascript: void(0);">Developer Information</a></li> + <ul style="display: none"> + + + <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/drill-patch-review-tool/">Drill Patch Review Tool</a></li> + + </ul> + + + + <li class="toctree-l2"><a href="javascript: void(0);">Contribute to Drill</a></li> + <ul style="display: none"> + + <li class="toctree-l3"><a class="reference internal" href="/docs/apache-drill-contribution-guidelines/">Apache Drill Contribution Guidelines</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/apache-drill-contribution-ideas/">Apache Drill Contribution Ideas</a></li> + + </ul> + + + + <li class="toctree-l2"><a href="javascript: void(0);">Design Docs</a></li> + <ul style="display: none"> + + <li class="toctree-l3"><a class="reference internal" href="/docs/drill-plan-syntax/">Drill Plan Syntax</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/rpc-overview/">RPC Overview</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/query-stages/">Query Stages</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/useful-research/">Useful Research</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/value-vectors/">Value Vectors</a></li> + + </ul> + + + </ul> + + + + <li class="toctree-l1"><a href="javascript: void(0);">Release Notes</a></li> + <ul style="display: none"> + + + <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-5-0-release-notes/">Apache Drill 0.5.0 Release Notes</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-4-0-release-notes/">Apache Drill 0.4.0 Release Notes</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache Drill M1 Release Notes (Apache Drill Alpha)</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache Drill M1 Release Notes (Apache Drill Alpha)</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-6-0-release-notes/">Apache Drill 0.6.0 Release Notes</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-7-0-release-notes/">Apache Drill 0.7.0 Release Notes</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-8-0-release-notes/">Apache Drill 0.8.0 Release Notes</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-9-0-release-notes/">Apache Drill 0.9.0 Release Notes</a></li> + + + </ul> + + + + <li class="toctree-l1"><a href="javascript: void(0);">Sample Datasets</a></li> + <ul style="display: none"> + + + <li class="toctree-l2"><a class="reference internal" href="/docs/aol-search/">AOL Search</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/enron-emails/">Enron Emails</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/wikipedia-edit-history/">Wikipedia Edit History</a></li> + + + </ul> + + + + <li class="toctree-l1"><a href="javascript: void(0);">Archived Pages</a></li> + <ul style="display: none"> + + + <li class="toctree-l2"><a class="reference internal" href="/docs/how-to-run-the-drill-demo/">How to Run the Drill Demo</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/what-is-apache-drill/">What is Apache Drill</a></li> + + + + <li class="toctree-l2"><a class="reference internal" href="/docs/partition-pruning/">Partition Pruning</a></li> + + + </ul> + + + + <li class="toctree-l1"><a href="javascript: void(0);">Progress Reports</a></li> + <ul style="display: none"> + + + <li class="toctree-l2"><a class="reference internal" href="/docs/2014-q1-drill-report/">2014 Q1 Drill Report</a></li> + + + </ul> + + + + <li class="toctree-l1"><a class="reference internal" href="/docs/project-bylaws/">Project Bylaws</a></li> + + + + <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> + + + </ul> + + + </ul> + + </div> + </div> +</aside> + + +<nav class="breadcrumbs"> + <li><a href="/docs/">Docs</a></li> + + + <li><a href="/docs/query-audit-logging/">Query Audit Logging</a></li> + + <li>Getting Query Information</li> +</nav> + +<div class="main-content-wrapper"> + <div class="main-content"> + + + <a class="edit-link" href="https://github.com/apache/drill/blob/gh-pages/_docs/075-getting-query-information.md"; target="_blank"><i class="fa fa-pencil-square-o"></i></a> + + + <div class="int_title left"> + <h1>Getting Query Information</h1> + + </div> + + <link href="/css/docpage.css" rel="stylesheet" type="text/css"> + + <div class="int_text" align="left"> + + <p>The query log provides audit log functionality for the queries executed by various drillbits in the cluster. The log records important information about queries executed on the Drillbit where Drill runs. The log includes query text, start time, end time, user, status, schema, and the query id. You can query one of the following log files, depending on whether you run Drill in embedded or distributed mode, to get audit logging information:</p> + +<ul> +<li><code>sqlline_queries.json</code> (embedded mode) </li> +<li><code>drillbit_queries.json</code> (distributed mode)</li> +</ul> + +<h2 id="checking-the-most-recent-queries">Checking the Most Recent Queries</h2> + +<p>For example, to check the most recent queries, query the log using this command:</p> +<div class="highlight"><pre><code class="language-text" data-lang="text">SELECT * FROM dfs.`default`.`/Users/drill-user/apache-drill-1.0.0/log/sqlline_queries.json` t ORDER BY `start` LIMIT 5; + ++----------------+------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------+----------------+------------+ +| finish | outcome | queryId | queryText | schema | start | username | ++----------------+------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------+----------------+------------+ +| 1431752662216 | FAILED | 2aa9302b-bf6f-a378-d66e-151834e87b16 | select * from dfs.`default`.`/Users/nrentachintala/Downloads/testgoogle.json` t limit 1 | | 1431752660376 | anonymous | +| 1431752769079 | COMPLETED | 2aa92fc1-b722-c27a-10f7-57a1cf0dd366 | SELECT KVGEN(checkin_info) checkins FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` LIMIT 2 | | 1431752765303 | anonymous | +| 1431752786341 | COMPLETED | 2aa92faf-2103-047b-9761-32eedefba1e6 | SELECT FLATTEN(KVGEN(checkin_info)) checkins FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` LIMIT 20 | | 1431752784532 | anonymous | +| 1431752809084 | FAILED | 2aa92f97-61d3-1e9a-97b0-c754f5b568d5 | SELECT SUM(checkintbl.checkins.`value`) AS TotalCheckins FROM (SELECT FLATTEN(KVGEN(checkin_info)) checkins FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` ) checkintbl | | 1431752808923 | anonymous | +| 1431752853992 | COMPLETED | 2aa92f87-0250-c6ac-3700-9ae1f98435b8 | SELECT SUM(checkintbl.checkins.`value`) AS TotalCheckins FROM (SELECT FLATTEN(KVGEN(checkin_info)) checkins FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` ) checkintbl | | 1431752824947 | anonymous | ++----------------+------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------+----------------+------------+ +5 rows selected (0.532 seconds) +</code></pre></div> +<div class="admonition note"> + <p class="first admonition-title">Note</p> + <p class="last">This document aligns Drill output for example purposes. Drill output is not aligned in this case. </p> +</div> + +<h2 id="checking-drillbit-traffic">Checking Drillbit Traffic</h2> + +<p>To check the total number of queries executed since the session started on the Drillbit, use the following command:</p> +<div class="highlight"><pre><code class="language-text" data-lang="text">SELECT COUNT(*) FROM dfs.`default`.`/Users/drill-user/apache-drill-1.0.0/log/sqlline_queries.json`; + ++---------+ +| EXPR$0 | ++---------+ +| 32 | ++---------+ +1 row selected (0.144 seconds) +</code></pre></div> +<h2 id="getting-query-success-statistics">Getting Query Success Statistics</h2> + +<p>To get the total number of successful and failed executions, run the following command:</p> +<div class="highlight"><pre><code class="language-text" data-lang="text">SELECT outcome, COUNT(*) FROM dfs.`default`.`/Users/drill-user/apache-drill-1.0.0/log/sqlline_queries.json` GROUP BY outcome; + ++------------+---------+ +| outcome | EXPR$1 | ++------------+---------+ +| COMPLETED | 18 | +| FAILED | 14 | ++------------+---------+ +2 rows selected (0.219 seconds) +</code></pre></div> +<p>Note the queryid column in the audit can be correlated with the profiles of the queries for troubleshooting/diagnostics purposes.</p> + + + + <div class="doc-nav"> + + <span class="previous-toc"><a href="/docs/query-audit-logging/">â Query Audit Logging</a></span><span class="next-toc"><a href="/docs/sql-reference/">SQL Reference â</a></span> +</div> + + + </div> + </div> +</div> + + </div> + <p class="push"></p> +<div id="footer" class="mw"> +<div class="wrapper"> +Copyright © 2012-2014 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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</head> + <body onResize="resized();"> <div class="page-wrap"> <div class="bui"></div> @@ -63,6 +58,12 @@ <li><a href="/docs/query-data/">Query Data</a></li> + <li><a href="/docs/performance-tuning/">Performance Tuning</a></li> + + <li><a href="/docs/log-and-debug/">Log and Debug</a></li> + + <li><a href="/docs/query-audit-logging/">Query Audit Logging</a></li> + <li><a href="/docs/sql-reference/">SQL Reference</a></li> <li><a href="/docs/data-sources-and-file-formats/">Data Sources and File Formats</a></li> @@ -81,6 +82,8 @@ <li><a href="/docs/project-bylaws/">Project Bylaws</a></li> + <li><a href="/docs/log-and-debug/">Log and Debug</a></li> + </ul> </li> <li class='nav'> @@ -110,7 +113,9 @@ </ul> </div> - + <link href="/css/content.css" rel="stylesheet" type="text/css"> + + @@ -149,14 +154,7 @@ - <li class="toctree-l2"><a href="javascript: void(0);">Architectural Highlights</a></li> - <ul style="display: none"> - - <li class="toctree-l3"><a class="reference internal" href="/docs/flexibility/">Flexibility</a></li> - - <li class="toctree-l3"><a class="reference internal" href="/docs/performance/">Performance</a></li> - - </ul> + <li class="toctree-l2"><a class="reference internal" href="/docs/performance/">Performance</a></li> </ul> @@ -203,6 +201,10 @@ <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> + + </ul> @@ -300,7 +302,7 @@ - <li class="toctree-l2"><a class="reference internal" href="/docs/partition-pruning/">Partition Pruning</a></li> + <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-the-drill-shell/">Configuring the Drill Shell</a></li> </ul> @@ -357,7 +359,7 @@ - <li class="toctree-l2"><a class="reference internal" href="/docs/using-jdbc/">Using JDBC</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> @@ -409,6 +411,10 @@ + <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-tibco-spotfire-server-with-drill/">Configuring Tibco Spotfire Server with Drill</a></li> + + + <li class="toctree-l2"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-9-desktop/">Using Apache Drill with Tableau 9 Desktop</a></li> @@ -487,6 +493,32 @@ + <li class="toctree-l1"><a href="javascript: void(0);">Performance Tuning</a></li> + <ul style="display: none"> + + + <li class="toctree-l2"><a class="reference internal" href="/docs/performance-tuning-introduction/">Performance Tuning Introduction</a></li> + + + </ul> + + + + <li class="toctree-l1"><a class="reference internal" href="/docs/log-and-debug/">Log and Debug</a></li> + + + + <li class="toctree-l1"><a href="javascript: void(0);">Query Audit Logging</a></li> + <ul style="display: none"> + + + <li class="toctree-l2"><a class="reference internal" href="/docs/getting-query-information/">Getting Query Information</a></li> + + + </ul> + + + <li class="toctree-l1"><a href="javascript: void(0);">SQL Reference</a></li> <ul style="display: none"> @@ -563,27 +595,47 @@ <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/alter-session-command/">ALTER SESSION Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/alter-session/">ALTER SESSION</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/alter-system-command/">ALTER SYSTEM Command</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-table-as-ctas-command/">CREATE TABLE AS (CTAS) Command</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/create-view-command/">CREATE VIEW Command</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/describe-command/">DESCRIBE Command</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/explain-commands/">EXPLAIN Commands</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/select-statements/">SELECT Statements</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/show-databases-and-show-schemas-command/">SHOW DATABASES and SHOW SCHEMAS Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-from/">SELECT FROM</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/show-files-command/">SHOW FILES Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-group-by/">SELECT GROUP BY</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/show-tables-command/">SHOW TABLES Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-having/">SELECT HAVING</a></li> - <li class="toctree-l3"><a class="reference internal" href="/docs/use-command/">USE Command</a></li> + <li class="toctree-l3"><a class="reference internal" href="/docs/select-limit/">SELECT LIMIT</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-offset/">SELECT OFFSET</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-order-by/">SELECT ORDER BY</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-union/">SELECT UNION</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-where/">SELECT WHERE</a></li> + + <li class="toctree-l3"><a class="reference internal" href="/docs/select-with/">SELECT WITH</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> </ul> @@ -782,6 +834,10 @@ <li class="toctree-l2"><a class="reference internal" href="/docs/what-is-apache-drill/">What is Apache Drill</a></li> + + <li class="toctree-l2"><a class="reference internal" href="/docs/partition-pruning/">Partition Pruning</a></li> + + </ul> @@ -800,6 +856,29 @@ <li class="toctree-l1"><a class="reference internal" href="/docs/project-bylaws/">Project Bylaws</a></li> + + <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> + + + </ul> + + </ul> </div> @@ -807,49 +886,49 @@ </aside> - 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