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Format</a></li>
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Plugin</a></li>
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Interfaces</a></li>
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SQuirreL on Windows</a></li>
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the ODBC Driver</a></li>
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href="/drill/docs/installing-the-driver-on-linux/">Installing the Driver on
Linux</a></li>
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href="/drill/docs/installing-the-driver-on-mac-os-x/">Installing the Driver on
Mac OS X</a></li>
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Windows</a></li>
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on Windows</a></li>
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void(0);">Configuring ODBC</a></li>
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Reference</a></li>
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X</a></li>
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Windows</a></li>
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Connection</a></li>
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Introduction</a></li>
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to Data</a></li>
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Views</a></li>
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MicroStrategy Analytics with Apache Drill</a></li>
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href="/drill/docs/using-tibco-spotfire-desktop-with-drill/">Using Tibco
Spotfire Desktop with Drill</a></li>
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href="/drill/docs/configuring-tibco-spotfire-server-with-drill/">Configuring
Tibco Spotfire Server with Drill</a></li>
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Drill</a></li>
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with Tableau 9 Server</a></li>
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Data</a></li>
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File System</a></li>
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Introduction</a></li>
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href="/drill/docs/querying-json-files/">Querying JSON Files</a></li>
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href="/drill/docs/querying-parquet-files/">Querying Parquet Files</a></li>
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href="/drill/docs/querying-plain-text-files/">Querying Plain Text Files</a></li>
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href="/drill/docs/querying-directories/">Querying Directories</a></li>
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Complex Data</a></li>
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href="/drill/docs/querying-complex-data-introduction/">Querying Complex Data
Introduction</a></li>
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href="/drill/docs/sample-data-donuts/">Sample Data: Donuts</a></li>
-
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href="/drill/docs/selecting-flat-data/">Selecting Flat Data</a></li>
-
- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/using-sql-functions-clauses-and-joins/">Using SQL Functions,
Clauses, and Joins</a></li>
-
- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/selecting-nested-data-for-a-column/">Selecting Nested Data
for a Column</a></li>
-
- <li class="toctree-l3"><a class="reference internal"
href="/drill/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="/drill/docs/querying-hive/">Querying Hive</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/querying-the-information-schema/">Querying the INFORMATION
SCHEMA</a></li>
-
-
-
- <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/querying-system-tables/">Querying System Tables</a></li>
-
-
-
- <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>
-
-
- </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="/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>
-
-
-
- <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>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/query-plans-and-tuning-introduction/">Query Plans and Tuning
Introduction</a></li>
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- <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>
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- <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>
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- <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>
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-
- <li class="toctree-l2"><a href="javascript:
void(0);">Identifying Performance Issues</a></li>
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href="/drill/docs/query-plans/">Query Plans</a></li>
-
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href="/drill/docs/query-profiles/">Query Profiles</a></li>
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- </ul>
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void(0);">Performance Tuning Reference</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/query-profile-column-descriptions/">Query Profile Column
Descriptions</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/physical-operators/">Physical Operators</a></li>
-
- </ul>
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-
- </ul>
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- <li class="toctree-l1"><a href="javascript: void(0);">Log and
Debug</a></li>
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- <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/log-and-debug-introduction/">Log and Debug
Introduction</a></li>
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- <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/error-messages/">Error Messages</a></li>
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- <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/modify-logback-xml/">Modify logback.xml</a></li>
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href="/drill/docs/review-the-java-stack-trace/">Review the Java Stack
Trace</a></li>
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- <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/query-audit-logging/">Query Audit Logging</a></li>
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- <li class="toctree-l1"><a href="javascript: void(0);">SQL
Reference</a></li>
- <ul style="display: none">
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href="/drill/docs/sql-reference-introduction/">SQL Reference
Introduction</a></li>
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Types</a></li>
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href="/drill/docs/supported-data-types/">Supported Data Types</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/date-time-and-timestamp/">Date, Time, and Timestamp</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/handling-different-data-types/">Handling Different Data
Types</a></li>
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- </ul>
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- <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/lexical-structure/">Lexical Structure</a></li>
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- <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/operators/">Operators</a></li>
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Functions</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/about-sql-function-examples/">About SQL Function
Examples</a></li>
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- <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>
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- <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>
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- </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>
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- <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>
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- <li class="toctree-l2"><a href="javascript: void(0);">Nested
Data Functions</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/nested-data-limitations/">Nested Data Limitations</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/flatten/">FLATTEN</a></li>
-
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href="/drill/docs/kvgen/">KVGEN</a></li>
-
- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/repeated-count/">REPEATED_COUNT</a></li>
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href="/drill/docs/repeated-contains/">REPEATED_CONTAINS</a></li>
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- </ul>
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href="/drill/docs/query-directory-functions/">Query Directory Functions</a></li>
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Commands</a></li>
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href="/drill/docs/supported-sql-commands/">Supported SQL Commands</a></li>
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href="/drill/docs/alter-session/">ALTER SESSION</a></li>
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href="/drill/docs/alter-system/">ALTER SYSTEM</a></li>
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href="/drill/docs/create-table-as-ctas/">CREATE TABLE AS (CTAS)</a></li>
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href="/drill/docs/partition-by-clause/">PARTITION BY Clause</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/create-view/">CREATE VIEW</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/describe/">DESCRIBE</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/drop-table/">DROP TABLE</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/drop-view/">DROP VIEW</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/explain/">EXPLAIN</a></li>
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href="/drill/docs/select/">SELECT</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/select-list/">SELECT List</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/from-clause/">FROM Clause</a></li>
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- <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>
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- <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>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/where-clause/">WHERE Clause</a></li>
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- <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>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/show-files/">SHOW FILES</a></li>
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href="/drill/docs/show-tables/">SHOW TABLES</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/use/">USE</a></li>
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- </ul>
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- <li class="toctree-l2"><a href="javascript: void(0);">SQL
Conditional Expressions</a></li>
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- <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/case/">CASE</a></li>
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- </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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href="/drill/docs/sql-extensions/">SQL Extensions</a></li>
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and File Formats</a></li>
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- <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>
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href="/drill/docs/hive-to-drill-data-type-mapping/">Hive-to-Drill Data Type
Mapping</a></li>
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href="/drill/docs/deploying-and-using-a-hive-udf/">Deploying and Using a Hive
UDF</a></li>
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href="/drill/docs/parquet-format/">Parquet Format</a></li>
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href="/drill/docs/json-data-model/">JSON Data Model</a></li>
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href="/drill/docs/text-files-csv-tsv-psv/">Text Files: CSV, TSV, PSV</a></li>
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href="/drill/docs/sequence-files/">Sequence Files</a></li>
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Functions</a></li>
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href="/drill/docs/develop-custom-functions-introduction/">Develop Custom
Functions Introduction</a></li>
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Function</a></li>
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href="/drill/docs/tutorial-develop-a-simple-function/">Tutorial: Develop a
Simple Function</a></li>
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href="/drill/docs/developing-an-aggregate-function/">Developing an Aggregate
Function</a></li>
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href="/drill/docs/adding-custom-functions-to-drill/">Adding Custom Functions to
Drill</a></li>
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href="/drill/docs/using-custom-functions-in-queries/">Using Custom Functions in
Queries</a></li>
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Interfaces</a></li>
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Source</a></li>
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Contribution Guidelines</a></li>
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- <h1>Configuration Options Introduction</h1>
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- <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 queryâs 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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