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- </ul>
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/querying-hive/">Querying Hive</a></li>
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/querying-the-information-schema/">Querying the INFORMATION SCHEMA</a></li>
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/querying-system-tables/">Querying System Tables</a></li>
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/monitoring-and-canceling-queries-in-the-drill-web-console/">Monitoring and Canceling Queries in the Drill Web Console</a></li>
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-
- </ul>
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-
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- <li class="toctree-l1"><a href="javascript: void(0);">Performance Tuning</a></li>
- <ul style="display: none">
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/performance-tuning-introduction/">Performance Tuning Introduction</a></li>
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/partition-pruning/">Partition Pruning</a></li>
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-
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/optimizing-parquet-metadata-reading/">Optimizing Parquet Metadata Reading</a></li>
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/choosing-a-storage-format/">Choosing a Storage Format</a></li>
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- <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="/drill/docs/query-plans-and-tuning-introduction/">Query Plans and Tuning Introduction</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/join-planning-guidelines/">Join Planning Guidelines</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/guidelines-for-optimizing-aggregation/">Guidelines for Optimizing Aggregation</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/modifying-query-planning-options/">Modifying Query Planning Options</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/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="/drill/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/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="/drill/docs/query-plans/">Query Plans</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/query-profiles/">Query Profiles</a></li>
-
- </ul>
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- <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="/drill/docs/query-profile-column-descriptions/">Query Profile Column Descriptions</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/physical-operators/">Physical Operators</a></li>
-
- </ul>
-
-
- </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="/drill/docs/log-and-debug-introduction/">Log and Debug Introduction</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/error-messages/">Error Messages</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/modify-logback-xml/">Modify logback.xml</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/review-the-java-stack-trace/">Review the Java Stack Trace</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/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="/drill/docs/sql-reference-introduction/">SQL Reference Introduction</a></li>
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- <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="/drill/docs/supported-data-types/">Supported Data Types</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/date-time-and-timestamp/">Date, Time, and Timestamp</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/handling-different-data-types/">Handling Different Data Types</a></li>
-
- </ul>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/lexical-structure/">Lexical Structure</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/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="/drill/docs/about-sql-function-examples/">About SQL Function Examples</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/math-and-trig/">Math and Trig</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/data-type-conversion/">Data Type Conversion</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/date-time-functions-and-arithmetic/">Date/Time Functions and Arithmetic</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/string-manipulation/">String Manipulation</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/aggregate-and-aggregate-statistical/">Aggregate and Aggregate Statistical</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/functions-for-handling-nulls/">Functions for Handling Nulls</a></li>
-
- </ul>
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-
-
- <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="/drill/docs/sql-window-functions-introduction/">SQL Window Functions Introduction</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/aggregate-window-functions/">Aggregate Window Functions</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/ranking-window-functions/">Ranking Window Functions</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/value-window-functions/">Value Window Functions</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/sql-window-functions-examples/">SQL Window Functions Examples</a></li>
-
- </ul>
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- <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="/drill/docs/nested-data-limitations/">Nested Data Limitations</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/flatten/">FLATTEN</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/kvgen/">KVGEN</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/repeated-count/">REPEATED_COUNT</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/repeated-contains/">REPEATED_CONTAINS</a></li>
-
- </ul>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/query-directory-functions/">Query Directory Functions</a></li>
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-
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- <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="/drill/docs/supported-sql-commands/">Supported SQL Commands</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/alter-session/">ALTER SESSION</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/alter-system/">ALTER SYSTEM</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/create-table-as-ctas/">CREATE TABLE AS (CTAS)</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/partition-by-clause/">PARTITION BY Clause</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/create-view/">CREATE VIEW</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/describe/">DESCRIBE</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/drop-table/">DROP TABLE</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/drop-view/">DROP VIEW</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/explain/">EXPLAIN</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/select/">SELECT</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/select-list/">SELECT List</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/from-clause/">FROM Clause</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/group-by-clause/">GROUP BY Clause</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/having-clause/">HAVING Clause</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/limit-clause/">LIMIT Clause</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/offset-clause/">OFFSET Clause</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/order-by-clause/">ORDER BY Clause</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/union-set-operator/">UNION Set Operator</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/where-clause/">WHERE Clause</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/with-clause/">WITH Clause</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/show-databases-and-show-schemas/">SHOW DATABASES and SHOW SCHEMAS</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/show-files/">SHOW FILES</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/show-tables/">SHOW TABLES</a></li>
-
- <li class="toctree-l3"><a class="reference internal" href="/drill/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="/drill/docs/case/">CASE</a></li>
-
- </ul>
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-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/reserved-keywords/">Reserved Keywords</a></li>
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-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/sql-extensions/">SQL Extensions</a></li>
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-
- </ul>
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- <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="/drill/docs/data-sources-and-file-formats-introduction/">Data Sources and File Formats Introduction</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/hive-to-drill-data-type-mapping/">Hive-to-Drill Data Type Mapping</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/deploying-and-using-a-hive-udf/">Deploying and Using a Hive UDF</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/parquet-format/">Parquet Format</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/json-data-model/">JSON Data Model</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/text-files-csv-tsv-psv/">Text Files: CSV, TSV, PSV</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/sequence-files/">Sequence Files</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="/drill/docs/develop-custom-functions-introduction/">Develop Custom Functions Introduction</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/developing-a-simple-function/">Developing a Simple Function</a></li>
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-
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/tutorial-develop-a-simple-function/">Tutorial: Develop a Simple Function</a></li>
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/developing-an-aggregate-function/">Developing an Aggregate Function</a></li>
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-
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/adding-custom-functions-to-drill/">Adding Custom Functions to Drill</a></li>
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-
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/using-custom-functions-in-queries/">Using Custom Functions in Queries</a></li>
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/custom-function-interfaces/">Custom Function Interfaces</a></li>
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-
- </ul>
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- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/compiling-drill-from-source/">Compiling Drill from Source</a></li>
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- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/drill-patch-review-tool/">Drill Patch Review Tool</a></li>
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- </ul>
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- <li class="toctree-l2"><a href="javascript: void(0);">Contribute to Drill</a></li>
- <ul style="display: none">
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- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/apache-drill-contribution-guidelines/">Apache Drill Contribution Guidelines</a></li>
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- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/apache-drill-contribution-ideas/">Apache Drill Contribution Ideas</a></li>
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- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/drill-plan-syntax/">Drill Plan Syntax</a></li>
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- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/rpc-overview/">RPC Overview</a></li>
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- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/query-stages/">Query Stages</a></li>
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- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/useful-research/">Useful Research</a></li>
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- <li class="toctree-l3"><a class="reference internal" href="/drill/docs/value-vectors/">Value Vectors</a></li>
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- <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-1-3-0-release-notes/">Apache Drill 1.3.0 Release Notes</a></li>
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- <li><a href="/drill/docs/">Docs</a></li>
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- <li><a href="/drill/docs/configure-drill/">Configure Drill</a></li>
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- <li><a href="/drill/docs/configuration-options/">Configuration Options</a></li>
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- <li>Configuration Options Introduction</li>
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- <h1>Configuration Options Introduction</h1>
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- </div>
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- <link href="/drill/css/docpage.css" rel="stylesheet" type="text/css">
-
- <div class="int_text" align="left">
-
- <p>Drill provides many configuration options that you can enable, disable, or
-modify. Modifying certain configuration options can impact Drill
-performance. Many of configuration options reside in the <code>drill-
-env.sh</code> and <code>drill-override.conf</code> files in the
-<code>/conf</code> directory. Drill sources<code>/etc/drill/conf</code> if it exists. Otherwise,
-Drill sources the local <code><drill_installation_directory>/conf</code> directory.</p>
-
-<p>The sys.options table contains information about system and session options. The sys.boot table contains information about Drill start-up options. The section, <a href="/drill/docs/start-up-options">"Start-up Options"</a>, covers how to configure and view key boot options. The following table lists the system options in alphabetical order and provides a brief description of supported options:</p>
-
-<h2 id="system-options">System Options</h2>
-
-<p>The sys.options table lists the following options that you can set as a system or session option as described in the section, <a href="/drill/docs/planning-and-execution-options">"Planning and Execution Options"</a>. </p>
-
-<table><thead>
-<tr>
-<th>Name</th>
-<th>Default</th>
-<th>Comments</th>
-</tr>
-</thead><tbody>
-<tr>
-<td>drill.exec.functions.cast_empty_string_to_null</td>
-<td>FALSE</td>
-<td>Not supported in this release.</td>
-</tr>
-<tr>
-<td>drill.exec.storage.file.partition.column.label</td>
-<td>dir</td>
-<td>The column label for directory levels in results of queries of files in a directory. Accepts a string input.</td>
-</tr>
-<tr>
-<td>exec.errors.verbose</td>
-<td>FALSE</td>
-<td>Toggles verbose output of executable error messages</td>
-</tr>
-<tr>
-<td>exec.java_compiler</td>
-<td>DEFAULT</td>
-<td>Switches between DEFAULT, JDK, and JANINO mode for the current session. Uses Janino by default for generated source code of less than exec.java_compiler_janino_maxsize; otherwise, switches to the JDK compiler.</td>
-</tr>
-<tr>
-<td>exec.java_compiler_debug</td>
-<td>TRUE</td>
-<td>Toggles the output of debug-level compiler error messages in runtime generated code.</td>
-</tr>
-<tr>
-<td>exec.java_compiler_janino_maxsize</td>
-<td>262144</td>
-<td>See the exec.java_compiler option comment. Accepts inputs of type LONG.</td>
-</tr>
-<tr>
-<td>exec.max_hash_table_size</td>
-<td>1073741824</td>
-<td>Ending size in buckets for hash tables. Range: 0 - 1073741824.</td>
-</tr>
-<tr>
-<td>exec.min_hash_table_size</td>
-<td>65536</td>
-<td>Starting size in bucketsfor hash tables. Increase according to available memory to improve performance. Increasing for very large aggregations or joins when you have large amounts of memory for Drill to use. Range: 0 - 1073741824.</td>
-</tr>
-<tr>
-<td>exec.queue.enable</td>
-<td>FALSE</td>
-<td>Changes the state of query queues. False allows unlimited concurrent queries.</td>
-</tr>
-<tr>
-<td>exec.queue.large</td>
-<td>10</td>
-<td>Sets the number of large queries that can run concurrently in the cluster. Range: 0-1000</td>
-</tr>
-<tr>
-<td>exec.queue.small</td>
-<td>100</td>
-<td>Sets the number of small queries that can run concurrently in the cluster. Range: 0-1001</td>
-</tr>
-<tr>
-<td>exec.queue.threshold</td>
-<td>30000000</td>
-<td>Sets the cost threshold, which depends on the complexity of the queries in queue, for determining whether query is large or small. Complex queries have higher thresholds. Range: 0-9223372036854775807</td>
-</tr>
-<tr>
-<td>exec.queue.timeout_millis</td>
-<td>300000</td>
-<td>Indicates how long a query can wait in queue before the query fails. Range: 0-9223372036854775807</td>
-</tr>
-<tr>
-<td>exec.schedule.assignment.old</td>
-<td>FALSE</td>
-<td>Used to prevent query failure when no work units are assigned to a minor fragment, particularly when the number of files is much larger than the number of leaf fragments.</td>
-</tr>
-<tr>
-<td>exec.storage.enable_new_text_reader</td>
-<td>TRUE</td>
-<td>Enables the text reader that complies with the RFC 4180 standard for text/csv files.</td>
-</tr>
-<tr>
-<td>new_view_default_permissions</td>
-<td>700</td>
-<td>Sets view permissions using an octal code in the Unix tradition.</td>
-</tr>
-<tr>
-<td>planner.add_producer_consumer</td>
-<td>FALSE</td>
-<td>Increase prefetching of data from disk. Disable for in-memory reads.</td>
-</tr>
-<tr>
-<td>planner.affinity_factor</td>
-<td>1.2</td>
-<td>Factor by which a node with endpoint affinity is favored while creating assignment. Accepts inputs of type DOUBLE.</td>
-</tr>
-<tr>
-<td>planner.broadcast_factor</td>
-<td>1</td>
-<td>A heuristic parameter for influencing the broadcast of records as part of a query.</td>
-</tr>
-<tr>
-<td>planner.broadcast_threshold</td>
-<td>10000000</td>
-<td>The maximum number of records allowed to be broadcast as part of a query. After one million records, Drill reshuffles data rather than doing a broadcast to one side of the join. Range: 0-2147483647</td>
-</tr>
-<tr>
-<td>planner.disable_exchanges</td>
-<td>FALSE</td>
-<td>Toggles the state of hashing to a random exchange.</td>
-</tr>
-<tr>
-<td>planner.enable_broadcast_join</td>
-<td>TRUE</td>
-<td>Changes the state of aggregation and join operators. The broadcast join can be used for hash join, merge join and nested loop join. Use to join a large (fact) table to relatively smaller (dimension) tables. Do not disable.</td>
-</tr>
-<tr>
-<td>planner.enable_constant_folding</td>
-<td>TRUE</td>
-<td>If one side of a filter condition is a constant expression, constant folding evaluates the expression in the planning phase and replaces the expression with the constant value. For example, Drill can rewrite WHERE age + 5 < 42 as WHERE age < 37.</td>
-</tr>
-<tr>
-<td>planner.enable_decimal_data_type</td>
-<td>FALSE</td>
-<td>False disables the DECIMAL data type, including casting to DECIMAL and reading DECIMAL types from Parquet and Hive.</td>
-</tr>
-<tr>
-<td>planner.enable_demux_exchange</td>
-<td>FALSE</td>
-<td>Toggles the state of hashing to a demulitplexed exchange.</td>
-</tr>
-<tr>
-<td>planner.enable_hash_single_key</td>
-<td>TRUE</td>
-<td>Each hash key is associated with a single value.</td>
-</tr>
-<tr>
-<td>planner.enable_hashagg</td>
-<td>TRUE</td>
-<td>Enable hash aggregation; otherwise, Drill does a sort-based aggregation. Does not write to disk. Enable is recommended.</td>
-</tr>
-<tr>
-<td>planner.enable_hashjoin</td>
-<td>TRUE</td>
-<td>Enable the memory hungry hash join. Drill assumes that a query with have adequate memory to complete and tries to use the fastest operations possible to complete the planned inner, left, right, or full outer joins using a hash table. Does not write to disk. Disabling hash join allows Drill to manage arbitrarily large data in a small memory footprint.</td>
-</tr>
-<tr>
-<td>planner.enable_hashjoin_swap</td>
-<td>TRUE</td>
-<td>Enables consideration of multiple join order sequences during the planning phase. Might negatively affect the performance of some queries due to inaccuracy of estimated row count especially after a filter, join, or aggregation.</td>
-</tr>
-<tr>
-<td>planner.enable_hep_join_opt</td>
-<td></td>
-<td>Enables the heuristic planner for joins.</td>
-</tr>
-<tr>
-<td>planner.enable_mergejoin</td>
-<td>TRUE</td>
-<td>Sort-based operation. A merge join is used for inner join, left and right outer joins. Inputs to the merge join must be sorted. It reads the sorted input streams from both sides and finds matching rows. Writes to disk.</td>
-</tr>
-<tr>
-<td>planner.enable_multiphase_agg</td>
-<td>TRUE</td>
-<td>Each minor fragment does a local aggregation in phase 1, distributes on a hash basis using GROUP-BY keys partially aggregated results to other fragments, and all the fragments perform a total aggregation using this data.</td>
-</tr>
-<tr>
-<td>planner.enable_mux_exchange</td>
-<td>TRUE</td>
-<td>Toggles the state of hashing to a multiplexed exchange.</td>
-</tr>
-<tr>
-<td>planner.enable_nestedloopjoin</td>
-<td>TRUE</td>
-<td>Sort-based operation. Writes to disk.</td>
-</tr>
-<tr>
-<td>planner.enable_nljoin_for_scalar_only</td>
-<td>TRUE</td>
-<td>Supports nested loop join planning where the right input is scalar in order to enable NOT-IN, Inequality, Cartesian, and uncorrelated EXISTS planning.</td>
-</tr>
-<tr>
-<td>planner.enable_streamagg</td>
-<td>TRUE</td>
-<td>Sort-based operation. Writes to disk.</td>
-</tr>
-<tr>
-<td>planner.identifier_max_length</td>
-<td>1024</td>
-<td>A minimum length is needed because option names are identifiers themselves.</td>
-</tr>
-<tr>
-<td>planner.join.hash_join_swap_margin_factor</td>
-<td>10</td>
-<td>The number of join order sequences to consider during the planning phase.</td>
-</tr>
-<tr>
-<td>planner.join.row_count_estimate_factor</td>
-<td>1</td>
-<td>The factor for adjusting the estimated row count when considering multiple join order sequences during the planning phase.</td>
-</tr>
-<tr>
-<td>planner.memory.average_field_width</td>
-<td>8</td>
-<td>Used in estimating memory requirements.</td>
-</tr>
-<tr>
-<td>planner.memory.enable_memory_estimation</td>
-<td>FALSE</td>
-<td>Toggles the state of memory estimation and re-planning of the query. When enabled, Drill conservatively estimates memory requirements and typically excludes these operators from the plan and negatively impacts performance.</td>
-</tr>
-<tr>
-<td>planner.memory.hash_agg_table_factor</td>
-<td>1.1</td>
-<td>A heuristic value for influencing the size of the hash aggregation table.</td>
-</tr>
-<tr>
-<td>planner.memory.hash_join_table_factor</td>
-<td>1.1</td>
-<td>A heuristic value for influencing the size of the hash aggregation table.</td>
-</tr>
-<tr>
-<td>planner.memory_limit</td>
-<td>268435456 bytes</td>
-<td>Defines the maximum amount of direct memory allocated to a query for planning. When multiple queries run concurrently, each query is allocated the amount of memory set by this parameter.Increase the value of this parameter and rerun the query if partition pruning failed due to insufficient memory.</td>
-</tr>
-<tr>
-<td>planner.memory.max_query_memory_per_node</td>
-<td>2147483648 bytes</td>
-<td>Sets the maximum estimate of memory for a query per node in bytes. If the estimate is too low, Drill re-plans the query without memory-constrained operators.</td>
-</tr>
-<tr>
-<td>planner.memory.non_blocking_operators_memory</td>
-<td>64</td>
-<td>Extra query memory per node for non-blocking operators. This option is currently used only for memory estimation. Range: 0-2048 MB</td>
-</tr>
-<tr>
-<td>planner.nestedloopjoin_factor</td>
-<td>100</td>
-<td>A heuristic value for influencing the nested loop join.</td>
-</tr>
-<tr>
-<td>planner.partitioner_sender_max_threads</td>
-<td>8</td>
-<td>Upper limit of threads for outbound queuing.</td>
-</tr>
-<tr>
-<td>planner.partitioner_sender_set_threads</td>
-<td>-1</td>
-<td>Overwrites the number of threads used to send out batches of records. Set to -1 to disable. Typically not changed.</td>
-</tr>
-<tr>
-<td>planner.partitioner_sender_threads_factor</td>
-<td>2</td>
-<td>A heuristic param to use to influence final number of threads. The higher the value the fewer the number of threads.</td>
-</tr>
-<tr>
-<td>planner.producer_consumer_queue_size</td>
-<td>10</td>
-<td>How much data to prefetch from disk in record batches out-of-band of query execution. The larger the queue size, the greater the amount of memory that the queue and overall query execution consumes.</td>
-</tr>
-<tr>
-<td>planner.slice_target</td>
-<td>100000</td>
-<td>The number of records manipulated within a fragment before Drill parallelizes operations.</td>
-</tr>
-<tr>
-<td>planner.width.max_per_node</td>
-<td>3</td>
-<td>Maximum number of threads that can run in parallel for a query on a node. A slice is an individual thread. This number indicates the maximum number of slices per query for the query\u2019s major fragment on a node.</td>
-</tr>
-<tr>
-<td>planner.width.max_per_query</td>
-<td>1000</td>
-<td>Same as max per node but applies to the query as executed by the entire cluster. For example, this value might be the number of active Drillbits, or a higher number to return results faster.</td>
-</tr>
-<tr>
-<td>store.format</td>
-<td>parquet</td>
-<td>Output format for data written to tables with the CREATE TABLE AS (CTAS) command. Allowed values are parquet, json, psv, csv, or tsv.</td>
-</tr>
-<tr>
-<td>store.hive.optimize_scan_with_native_readers</td>
-<td>FALSE</td>
-<td>Optimize reads of Parquet-backed external tables from Hive by using Drill native readers instead of the Hive Serde interface. (Drill 1.2 and later)</td>
-</tr>
-<tr>
-<td>store.json.all_text_mode</td>
-<td>FALSE</td>
-<td>Drill reads all data from the JSON files as VARCHAR. Prevents schema change errors.</td>
-</tr>
-<tr>
-<td>store.json.extended_types</td>
-<td>FALSE</td>
-<td>Turns on special JSON structures that Drill serializes for storing more type information than the <a href="http://docs.mongodb.org/manual/reference/mongodb-extended-json/">four basic JSON types</a>.</td>
-</tr>
-<tr>
-<td>store.json.read_numbers_as_double</td>
-<td>FALSE</td>
-<td>Reads numbers with or without a decimal point as DOUBLE. Prevents schema change errors.</td>
-</tr>
-<tr>
-<td>store.mongo.all_text_mode</td>
-<td>FALSE</td>
-<td>Similar to store.json.all_text_mode for MongoDB.</td>
-</tr>
-<tr>
-<td>store.mongo.read_numbers_as_double</td>
-<td>FALSE</td>
-<td>Similar to store.json.read_numbers_as_double.</td>
-</tr>
-<tr>
-<td>store.parquet.block-size</td>
-<td>536870912</td>
-<td>Sets the size of a Parquet row group to the number of bytes less than or equal to the block size of MFS, HDFS, or the file system.</td>
-</tr>
-<tr>
-<td>store.parquet.compression</td>
-<td>snappy</td>
-<td>Compression type for storing Parquet output. Allowed values: snappy, gzip, none</td>
-</tr>
-<tr>
-<td>store.parquet.enable_dictionary_encoding</td>
-<td>FALSE</td>
-<td>For internal use. Do not change.</td>
-</tr>
-<tr>
-<td>store.parquet.use_new_reader</td>
-<td>FALSE</td>
-<td>Not supported in this release.</td>
-</tr>
-<tr>
-<td>store.partition.hash_distribute</td>
-<td>FALSE</td>
-<td>Uses a hash algorithm to distribute data on partition keys in a CTAS partitioning operation. An alpha option--for experimental use at this stage. Do not use in production systems.</td>
-</tr>
-<tr>
-<td>store.text.estimated_row_size_bytes</td>
-<td>100</td>
-<td>Estimate of the row size in a delimited text file, such as csv. The closer to actual, the better the query plan. Used for all csv files in the system/session where the value is set. Impacts the decision to plan a broadcast join or not.</td>
-</tr>
-<tr>
-<td>window.enable</td>
-<td>TRUE</td>
-<td>Enable or disable window functions in Drill 1.1 and later.</td>
-</tr>
-</tbody></table>
-
-
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