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-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/docs/querying-a-file-system-introduction/">Querying a File System 
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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href="/drill/docs/querying-sequence-files/">Querying Sequence Files</a></li>
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-            </ul>
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-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/querying-hbase/">Querying HBase</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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-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/docs/selecting-flat-data/">Selecting Flat Data</a></li>
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-                <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>
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-                <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>
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-                <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>
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-            </ul>
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-          
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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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href="/drill/docs/querying-the-information-schema/">Querying the INFORMATION 
SCHEMA</a></li>
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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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-      
-        
-          <li class="toctree-l1"><a href="javascript: void(0);">Performance 
Tuning</a></li>
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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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href="/drill/docs/partition-pruning/">Partition Pruning</a></li>
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href="/drill/docs/optimizing-parquet-metadata-reading/">Optimizing Parquet 
Metadata Reading</a></li>
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-          
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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>
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-                <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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href="/drill/docs/modifying-query-planning-options/">Modifying Query Planning 
Options</a></li>
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-                <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>
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-                <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>
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-            </ul>
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-          
-            
-              <li class="toctree-l2"><a href="javascript: 
void(0);">Identifying Performance Issues</a></li>
-              <ul style="display: none">
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-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/docs/query-plans/">Query Plans</a></li>
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-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/docs/query-profiles/">Query Profiles</a></li>
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-            </ul>
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-          
-            
-              <li class="toctree-l2"><a href="javascript: 
void(0);">Performance Tuning Reference</a></li>
-              <ul style="display: none">
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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>
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-            </ul>
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-          
-          </ul>
-        
-      
-        
-          <li class="toctree-l1"><a href="javascript: void(0);">Log and 
Debug</a></li>
-          <ul style="display: none">
-          
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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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-          
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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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-          
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href="/drill/docs/modify-logback-xml/">Modify logback.xml</a></li>
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-          
-            
-              <li class="toctree-l2"><a class="reference internal" 
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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-          
-          </ul>
-        
-      
-        
-          <li class="toctree-l1 current_section "><a href="javascript: 
void(0);">SQL Reference</a></li>
-          <ul class="current_section">
-          
-            
-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/sql-reference-introduction/">SQL Reference 
Introduction</a></li>
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-          
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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>
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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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-          
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-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/operators/">Operators</a></li>
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-          
-            
-              <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>
-            
-          
-            
-              <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>
-            
-          
-            
-              <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>
-            
-          
-            
-              <li class="toctree-l2"><a href="javascript: void(0);">SQL 
Commands</a></li>
-              <ul style="">
-              
-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/docs/supported-sql-commands/">Supported SQL Commands</a></li>
-              
-                <li class="toctree-l3 current"><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>
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-            </ul>
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-          
-            
-              <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>
-            
-          
-            
-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/reserved-keywords/">Reserved Keywords</a></li>
-            
-          
-            
-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/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="/drill/docs/data-sources-and-file-formats-introduction/">Data Sources and 
File Formats Introduction</a></li>
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-          
-            
-              <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>
-            
-          
-            
-              <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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-          
-            
-              <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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-          
-            
-              <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-l1"><a class="reference internal" 
href="/drill/docs/troubleshooting/">Troubleshooting</a></li>
-        
-      
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Information</a></li>
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-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/rest-api/">REST API</a></li>
-            
-          
-            
-              <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="/drill/docs/compiling-drill-from-source/">Compiling Drill from 
Source</a></li>
-              
-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/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="/drill/docs/apache-drill-contribution-guidelines/">Apache Drill 
Contribution Guidelines</a></li>
-              
-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/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="/drill/docs/drill-plan-syntax/">Drill Plan Syntax</a></li>
-              
-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/docs/rpc-overview/">RPC Overview</a></li>
-              
-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/docs/query-stages/">Query Stages</a></li>
-              
-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/docs/useful-research/">Useful Research</a></li>
-              
-                <li class="toctree-l3"><a class="reference internal" 
href="/drill/docs/value-vectors/">Value Vectors</a></li>
-              
-            </ul>
-            
-          
-          </ul>
-        
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-        
-          <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="/drill/docs/apache-drill-1-3-0-release-notes/">Apache Drill 1.3.0 Release 
Notes</a></li>
-            
-          
-            
-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/apache-drill-1-2-0-release-notes/">Apache Drill 1.2.0 Release 
Notes</a></li>
-            
-          
-            
-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/apache-drill-1-1-0-release-notes/">Apache Drill 1.1.0 Release 
Notes</a></li>
-            
-          
-            
-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/apache-drill-1-0-0-release-notes/">Apache Drill 1.0.0 Release 
Notes</a></li>
-            
-          
-            
-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/apache-drill-0-9-0-release-notes/">Apache Drill 0.9.0 Release 
Notes</a></li>
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-          
-            
-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/apache-drill-0-8-0-release-notes/">Apache Drill 0.8.0 Release 
Notes</a></li>
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-          
-            
-              <li class="toctree-l2"><a class="reference internal" 
href="/drill/docs/apache-drill-0-7-0-release-notes/">Apache Drill 0.7.0 Release 
Notes</a></li>
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-      <h1>ALTER SESSION</h1>
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-        <p>The ALTER SESSION command changes a system setting for the duration 
of a
-session. Session level settings override system level settings.</p>
-
-<h2 id="syntax">Syntax</h2>
-
-<p>The ALTER SESSION command supports the following syntax:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">ALTER 
SESSION SET `option_name` = value;
-</code></pre></div>
-<h2 id="parameters">Parameters</h2>
-
-<p><em>option_name</em><br>
-This is the option name as it appears in the systems table.</p>
-
-<p><em>value</em><br>
-A value of the type listed in the sys.options table: number, string, boolean,
-or float. Use the appropriate value type for each option that you set.</p>
-
-<h2 id="usage-notes">Usage Notes</h2>
-
-<p>Use the ALTER SESSION command to set Drill query planning and execution
-options per session in a cluster. The options that you set using the ALTER
-SESSION command only apply to queries that run during the current Drill
-connection. A session ends when you quit the Drill shell. You can set any of
-the system level options at the session level.</p>
-
-<p>You can run the following query to see a complete list of planning and
-execution options that are currently set at the system or session level:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: 
jdbc:drill:zk=local&gt; SELECT name, type FROM sys.options WHERE type in 
(&#39;SYSTEM&#39;,&#39;SESSION&#39;) order by name;
-+------------+----------------------------------------------+
-|   name                                       |    type    |
-+----------------------------------------------+------------+
-| drill.exec.functions.cast_empty_string_to_null | SYSTEM   |
-| drill.exec.storage.file.partition.column.label | SYSTEM   |
-| exec.errors.verbose                          | SYSTEM     |
-| exec.java_compiler                           | SYSTEM     |
-| exec.java_compiler_debug                     | SYSTEM     |
-…
-+------------+----------------------------------------------+
-</code></pre></div>
-<div class="admonition note">
-  <p class="first admonition-title">Note</p>
-  <p class="last">This is a truncated version of the list.  </p>
-</div>
-
-<h2 id="example">Example</h2>
-
-<p>This example demonstrates how to use the ALTER SESSION command to set the
-<code>store.json.all_text_mode</code> option to “true” for the current 
Drill session.
-Setting this option to “true” enables text mode so that Drill reads 
everything
-in JSON as a text object instead of trying to interpret data types. This
-allows complicated JSON to be read using CASE and CAST.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: 
jdbc:drill:zk=local&gt; alter session set `store.json.all_text_mode`= true;
-+------------+------------+
-|   ok  |  summary   |
-+------------+------------+
-| true      | store.json.all_text_mode updated. |
-+------------+------------+
-1 row selected (0.046 seconds)
-</code></pre></div>
-<p>You can issue a query to see all of the session level settings. Note that 
the
-option type is case-sensitive.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: 
jdbc:drill:zk=local&gt; SELECT name, type, bool_val FROM sys.options WHERE type 
= &#39;SESSION&#39; order by name;
-+------------+------------+------------+
-|   name    |   type    |  bool_val  |
-+------------+------------+------------+
-| store.json.all_text_mode | SESSION    | true      |
-+------------+------------+------------+
-1 row selected (0.176 seconds)
-</code></pre></div>
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