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From bridg...@apache.org
Subject [2/4] drill-site git commit: updates for 1.2
Date Mon, 05 Oct 2015 23:14:07 GMT
http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/optimizing-parquet-reading/index.html
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+            </ul>
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+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-drill-on-windows/">Installing Drill on Windows</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/starting-drill-on-windows/">Starting Drill on Windows</a></li>
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+            </ul>
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+          
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+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-drill-on-the-cluster/">Installing Drill on the Cluster</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/starting-drill-in-distributed-mode/">Starting Drill in Distributed Mode</a></li>
+              
+            </ul>
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+              <li class="toctree-l2"><a class="reference internal" href="/docs/starting-the-web-console/">Starting the Web Console</a></li>
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+          
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+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Configure Drill</a></li>
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+          
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+              <li class="toctree-l2"><a class="reference internal" href="/docs/configure-drill-introduction/">Configure Drill Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-drill-memory/">Configuring Drill Memory</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Configuring a Multitenant Cluster</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-a-multitenant-cluster-introduction/">Configuring a Multitenant Cluster Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-multitenant-resources/">Configuring Multitenant Resources</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-resources-for-a-shared-drillbit/">Configuring Resources for a Shared Drillbit</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-user-impersonation/">Configuring User Impersonation</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-user-authentication/">Configuring User Authentication</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-user-impersonation-with-hive-authorization/">Configuring User Impersonation with Hive Authorization</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-web-console-and-rest-api-security/">Configuring Web Console and REST API Security</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Configuration Options</a></li>
+              <ul style="display: none">
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+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuration-options-introduction/">Configuration Options Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/start-up-options/">Start-Up Options</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/planning-and-execution-options/">Planning and Execution Options</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/persistent-configuration-storage/">Persistent Configuration Storage</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/ports-used-by-drill/">Ports Used by Drill</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-the-drill-shell/">Configuring the Drill Shell</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Connect a Data Source</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/connect-a-data-source-introduction/">Connect a Data Source Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/storage-plugin-registration/">Storage Plugin Registration</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Storage Plugin Configuration</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/plugin-configuration-basics/">Plugin Configuration Basics</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/file-system-storage-plugin/">File System Storage Plugin</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/workspaces/">Workspaces</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/hbase-storage-plugin/">HBase Storage Plugin</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/hive-storage-plugin/">Hive Storage Plugin</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drill-default-input-format/">Drill Default Input Format</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/mongodb-plugin-for-apache-drill/">MongoDB Plugin for Apache Drill</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/mapr-db-format/">MapR-DB Format</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">ODBC/JDBC Interfaces</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/interfaces-introduction/">Interfaces Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/using-the-jdbc-driver/">Using the JDBC Driver</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/using-jdbc-with-squirrel-on-windows/">Using JDBC with SQuirreL on Windows</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Installing the ODBC Driver</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-linux/">Installing the Driver on Linux</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-mac-os-x/">Installing the Driver on Mac OS X</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-windows/">Installing the Driver on Windows</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-tdc-file-on-windows/">Installing the TDC File on Windows</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Configuring ODBC</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/odbc-configuration-reference/">ODBC Configuration Reference</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-odbc-on-linux/">Configuring ODBC on Linux</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-odbc-on-mac-os-x/">Configuring ODBC on Mac OS X</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-odbc-on-windows/">Configuring ODBC on Windows</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/testing-the-odbc-connection/">Testing the ODBC Connection</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Using Drill Explorer</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drill-explorer-introduction/">Drill Explorer Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/connecting-drill-explorer-to-data/">Connecting Drill Explorer to Data</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/browsing-data-and-defining-views/">Browsing Data and Defining Views</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Using Drill with BI Tools</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-drill-with-bi-tools-introduction/">Using Drill with BI Tools Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/tableau-examples/">Tableau Examples</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-microstrategy-analytics-with-apache-drill/">Using MicroStrategy Analytics with Apache Drill</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-tibco-spotfire-desktop-with-drill/">Using Tibco Spotfire Desktop with Drill</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-tibco-spotfire-server-with-drill/">Configuring Tibco Spotfire Server with Drill</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-9-desktop/">Using Apache Drill with Tableau 9 Desktop</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-9-server/">Using Apache Drill with Tableau 9 Server</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-jreport-with-drill/">Configuring JReport with Drill</a></li>
+              
+            </ul>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Query Data</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/query-data-introduction/">Query Data Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Querying a File System</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-a-file-system-introduction/">Querying a File System Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-json-files/">Querying JSON Files</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-parquet-files/">Querying Parquet Files</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-plain-text-files/">Querying Plain Text Files</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-directories/">Querying Directories</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/querying-hbase/">Querying HBase</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Querying Complex Data</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-complex-data-introduction/">Querying Complex Data Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/sample-data-donuts/">Sample Data: Donuts</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-flat-data/">Selecting Flat Data</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-sql-functions-clauses-and-joins/">Using SQL Functions, Clauses, and Joins</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-nested-data-for-a-column/">Selecting Nested Data for a Column</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-multiple-columns-within-nested-data/">Selecting Multiple Columns Within Nested Data</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/querying-hive/">Querying Hive</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/querying-the-information-schema/">Querying the INFORMATION SCHEMA</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/querying-system-tables/">Querying System Tables</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/monitoring-and-canceling-queries-in-the-drill-web-console/">Monitoring and Canceling Queries in the Drill Web Console</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1 current_section "><a href="javascript: void(0);">Performance Tuning</a></li>
+          <ul class="current_section">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/performance-tuning-introduction/">Performance Tuning Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/partition-pruning/">Partition Pruning</a></li>
+            
+          
+            
+              <li class="toctree-l2 current"><a class="reference internal" href="/docs/optimizing-parquet-reading/">Optimizing Parquet Reading</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/choosing-a-storage-format/">Choosing a Storage Format</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Query Plans and Tuning</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/query-plans-and-tuning-introduction/">Query Plans and Tuning Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/join-planning-guidelines/">Join Planning Guidelines</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/guidelines-for-optimizing-aggregation/">Guidelines for Optimizing Aggregation</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/modifying-query-planning-options/">Modifying Query Planning Options</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/sort-based-and-hash-based-memory-constrained-operators/">Sort-Based and Hash-Based Memory-Constrained Operators</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Identifying Performance Issues</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/query-plans/">Query Plans</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/query-profiles/">Query Profiles</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Performance Tuning Reference</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/query-profile-column-descriptions/">Query Profile Column Descriptions</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/physical-operators/">Physical Operators</a></li>
+              
+            </ul>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Log and Debug</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/log-and-debug-introduction/">Log and Debug Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/error-messages/">Error Messages</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/modify-logback-xml/">Modify logback.xml</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/review-the-java-stack-trace/">Review the Java Stack Trace</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/query-audit-logging/">Query Audit Logging</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">SQL Reference</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/sql-reference-introduction/">SQL Reference Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Data Types</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/supported-data-types/">Supported Data Types</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/date-time-and-timestamp/">Date, Time, and Timestamp</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/handling-different-data-types/">Handling Different Data Types</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/lexical-structure/">Lexical Structure</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/operators/">Operators</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">SQL Functions</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/about-sql-function-examples/">About SQL Function Examples</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/math-and-trig/">Math and Trig</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/data-type-conversion/">Data Type Conversion</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/date-time-functions-and-arithmetic/">Date/Time Functions and Arithmetic</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/string-manipulation/">String Manipulation</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/aggregate-and-aggregate-statistical/">Aggregate and Aggregate Statistical</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/functions-for-handling-nulls/">Functions for Handling Nulls</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">SQL Window Functions</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/sql-window-functions-introduction/">SQL Window Functions Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/aggregate-window-functions/">Aggregate Window Functions</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/ranking-window-functions/">Ranking Window Functions</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/value-window-functions/">Value Window Functions</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/sql-window-functions-examples/">SQL Window Functions Examples</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Nested Data Functions</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/nested-data-limitations/">Nested Data Limitations</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/flatten/">FLATTEN</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/kvgen/">KVGEN</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/repeated-count/">REPEATED_COUNT</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/repeated-contains/">REPEATED_CONTAINS</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/query-directory-functions/">Query Directory Functions</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">SQL Commands</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/supported-sql-commands/">Supported SQL Commands</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/alter-session/">ALTER SESSION</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/alter-system/">ALTER SYSTEM</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/create-table-as-ctas/">CREATE TABLE AS (CTAS)</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/partition-by-clause/">PARTITION BY Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/create-view/">CREATE VIEW</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/describe/">DESCRIBE</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drop-table/">DROP TABLE</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drop-view/">DROP VIEW</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/explain/">EXPLAIN</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/select/">SELECT</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/select-list/">SELECT List</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/from-clause/">FROM Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/group-by-clause/">GROUP BY Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/having-clause/">HAVING Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/limit-clause/">LIMIT Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/offset-clause/">OFFSET Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/order-by-clause/">ORDER BY Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/union-set-operator/">UNION Set Operator</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/where-clause/">WHERE Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/with-clause/">WITH Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/show-databases-and-show-schemas/">SHOW DATABASES and SHOW SCHEMAS</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/show-files/">SHOW FILES</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/show-tables/">SHOW TABLES</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/use/">USE</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">SQL Conditional Expressions</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/case/">CASE</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/reserved-keywords/">Reserved Keywords</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/sql-extensions/">SQL Extensions</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Data Sources and File Formats</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/data-sources-and-file-formats-introduction/">Data Sources and File Formats Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/hive-to-drill-data-type-mapping/">Hive-to-Drill Data Type Mapping</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/deploying-and-using-a-hive-udf/">Deploying and Using a Hive UDF</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/parquet-format/">Parquet Format</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/json-data-model/">JSON Data Model</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/text-files-csv-tsv-psv/">Text Files: CSV, TSV, PSV</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Develop Custom Functions</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/develop-custom-functions-introduction/">Develop Custom Functions Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/developing-a-simple-function/">Developing a Simple Function</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/tutorial-develop-a-simple-function/">Tutorial: Develop a Simple Function</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/developing-an-aggregate-function/">Developing an Aggregate Function</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/adding-custom-functions-to-drill/">Adding Custom Functions to Drill</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/using-custom-functions-in-queries/">Using Custom Functions in Queries</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/custom-function-interfaces/">Custom Function Interfaces</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a class="reference internal" href="/docs/troubleshooting/">Troubleshooting</a></li>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Developer Information</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Develop Drill</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/compiling-drill-from-source/">Compiling Drill from Source</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drill-patch-review-tool/">Drill Patch Review Tool</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Contribute to Drill</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/apache-drill-contribution-guidelines/">Apache Drill Contribution Guidelines</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/apache-drill-contribution-ideas/">Apache Drill Contribution Ideas</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Design Docs</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drill-plan-syntax/">Drill Plan Syntax</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/rpc-overview/">RPC Overview</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/query-stages/">Query Stages</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/useful-research/">Useful Research</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/value-vectors/">Value Vectors</a></li>
+              
+            </ul>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Release Notes</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-1-0-release-notes/">Apache Drill 1.1.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/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="/docs/apache-drill-0-9-0-release-notes/">Apache Drill 0.9.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-8-0-release-notes/">Apache Drill 0.8.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-7-0-release-notes/">Apache Drill 0.7.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-6-0-release-notes/">Apache Drill 0.6.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache Drill M1 Release Notes (Apache Drill Alpha)</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache Drill M1 Release Notes (Apache Drill Alpha)</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-5-0-release-notes/">Apache Drill 0.5.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-4-0-release-notes/">Apache Drill 0.4.0 Release Notes</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Sample Datasets</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/aol-search/">AOL Search</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/enron-emails/">Enron Emails</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/wikipedia-edit-history/">Wikipedia Edit History</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a class="reference internal" href="/docs/project-bylaws/">Project Bylaws</a></li>
+        
+      
+      </ul>
+
+    </div>
+  </div>
+</aside>
+
+
+<nav class="breadcrumbs">
+  <li><a href="/docs/">Docs</a></li>
+ 
+  
+    <li><a href="/docs/performance-tuning/">Performance Tuning</a></li>
+  
+  <li>Optimizing Parquet Reading</li>
+</nav>
+
+<div class="main-content-wrapper">
+  <div class="main-content">
+
+    
+      <a class="edit-link" href="https://github.com/apache/drill/blob/gh-pages/_docs/performance-tuning/025-optimizing-parquet-reading.md" target="_blank"><i class="fa fa-pencil-square-o"></i></a>
+    
+
+    <div class="int_title left">
+      <h1>Optimizing Parquet Reading</h1>
+
+    </div>
+
+    <link href="/css/docpage.css" rel="stylesheet" type="text/css">
+
+    <div class="int_text" align="left">
+      
+        <p>Parquet metadata caching is an optional feature in Drill 1.2 and later. When you use this feature, Drill generates a metadata cache file. Drill stores the metadata cache file  in a directory you specify and its subdirectories. When you run a query on this directory or a subdirectory, Drill reads the metadata cache file instead of the actual files that contain the metadata during the query-planning phase. You can realize performance improvements during the query-planning phase when Drill reads just one metadata file instead of reading multiple files to fetch the metadata.</p>
+
+<p>The Parquet metadata caching feature enables Drill to speed up the cost of query planning. The actual query runtime will not be improved if the planning cost is not a bottleneck.</p>
+
+<h2 id="when-to-use-parquet-metadata-caching">When to Use Parquet Metadata Caching</h2>
+
+<p>Use Parquet metadata caching to optimize reads only when the planning phase of a query takes longer than the execution phase. Before using this feature, run your query and compare the time for executing the logical (planning) and physical (execution) operations to see if using this feature makes sense. The logical/planning operations must take longer than the physical/execution operations; otherwise, do not create Parquet metadata because Drill cannot optimize reads under these conditions.</p>
+
+<h2 id="how-to-trigger-generation-of-the-parquet-metadata-cache-file">How to Trigger Generation of the Parquet Metadata Cache File</h2>
+
+<p>The following command generates the Parquet metadata cache file in the <code>&lt;path to table&gt;</code> and its subdirectories.</p>
+
+<p><code>REFRESH TABLE METADATA &lt;path to table&gt;</code></p>
+
+<p>You need to run this command on a directory, nested or flat, only once during the session. Only the first query gathers the metadata unless the Parquet data changes, for example, you delete some data. If you did not make changes to the Parquet data, subsequent queries encounter the up-to-date Parquet metadata files. There is no need for Drill to regenerate the metadata. If there are changes, the metadata needs updating, so Drill regenerates the Parquet metadata when you issue the next query.</p>
+
+<p>The elapsed time of any queries that trigger regeneration of data can be greater than that of other queries.</p>
+
+<h2 id="example-of-generating-parquet-metadata">Example of Generating Parquet Metadata</h2>
+<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:schema=dfs&gt; REFRESH TABLE METADATA t1;
++-------+----------------------------------------------+
+|  ok   |                   summary                    |
++-------+----------------------------------------------+
+| true  | Successfully updated metadata for table t1.  |
++-------+----------------------------------------------+
+1 row selected (0.445 seconds)
+</code></pre></div>
+<h2 id="how-drill-generates-and-uses-parquet-metadata">How Drill Generates and Uses Parquet Metadata</h2>
+
+<p>After running the REFRESH TABLE METADATA command, Drill traverses directories in the case of nested directories to find the Parquet files. From the footers of the files, Drill gathers metadata, such as row counts and node affinity based on HDFS block locations. For each directory level, Drill saves a summary of the information from the footers in a single Parquet metadata cache file. The summary at each level covers that particular level and all lower levels; consequently, after generating metadata, you can query nested directories from any level. For example, you can query a subdirectory of Parquet files because Drill stores a Parquet metadata cache file at each level.</p>
+
+<p>At planning time, Drill reads only the metadata file. Parquet metadata caching has no effect on execution time. At execution time, Drill reads the actual files.</p>
+
+    
+      
+        <div class="doc-nav">
+  
+  <span class="previous-toc"><a href="/docs/partition-pruning/">← Partition Pruning</a></span><span class="next-toc"><a href="/docs/choosing-a-storage-format/">Choosing a Storage Format →</a></span>
+</div>
+
+    
+    </div>
+  </div>
+</div>
+
+  </div>
+  <p class="push"></p>
+<div id="footer" class="mw">
+<div class="wrapper">
+Copyright © 2012-2014 The Apache Software Foundation, licensed under the Apache License, Version 2.0.<br>
+Apache and the Apache feather logo are trademarks of The Apache Software Foundation. Other names appearing on the site may be trademarks of their respective owners.<br/><br/>
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+</div>
+
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+  <span class="previous-toc"><a href="/docs/performance-tuning-introduction/">← Performance Tuning Introduction</a></span><span class="next-toc"><a href="/docs/optimizing-parquet-reading/">Optimizing Parquet Reading →</a></span>
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/querying-hbase/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/querying-hive/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/querying-json-files/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/querying-parquet-files/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/querying-plain-text-files/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/querying-system-tables/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/querying-the-information-schema/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/ranking-window-functions/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/release-notes/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/repeated-contains/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/repeated-count/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/reserved-keywords/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/review-the-java-stack-trace/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/rpc-overview/index.html
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+              <li class="toctree-l2"><a class="reference internal" href="/docs/optimizing-parquet-reading/">Optimizing Parquet Reading</a></li>
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/sample-data-donuts/index.html
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/78d5ee80/docs/sample-datasets/index.html
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+              <li class="toctree-l2"><a class="reference internal" href="/docs/optimizing-parquet-reading/">Optimizing Parquet Reading</a></li>
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