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Posted to commits@drill.apache.org by ts...@apache.org on 2015/05/04 21:26:58 UTC
[26/51] [partial] drill-site git commit: Initial commit
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/handling-different-data-types/">Handling Different Data Types</a></li>
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+ <li class="toctree-l2"><a class="reference internal" href="/docs/lexical-structure/">Lexical Structure</a></li>
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+ <li class="toctree-l2"><a href="javascript: void(0);">SQL Functions</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/data-type-conversion/">Data Type Conversion</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/aggregate-and-aggregate-statistical/">Aggregate and Aggregate Statistical</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/functions-for-handling-nulls/">Functions for Handling Nulls</a></li>
+
+ </ul>
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+ <li class="toctree-l2"><a href="javascript: void(0);">Nested Data Functions</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/nested-data-limitations/">Nested Data Limitations</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/flatten/">FLATTEN</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/kvgen/">KVGEN</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/repeated-count/">REPEATED_COUNT</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/repeated-contains/">REPEATED_CONTAINS</a></li>
+
+ </ul>
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+ <li class="toctree-l2"><a class="reference internal" href="/docs/query-directory-functions/">Query Directory Functions</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/alter-session-command/">ALTER SESSION Command</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/alter-system-command/">ALTER SYSTEM Command</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/create-table-as-ctas-command/">CREATE TABLE AS (CTAS) command</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/create-view-command/">CREATE VIEW command</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/describe-command/">DESCRIBE Command</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/explain-commands/">EXPLAIN commands</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/select-statements/">SELECT Statements</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/show-databases-and-show-schemas-command/">SHOW DATABASES AND SHOW SCHEMAS Command</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/show-files-command/">SHOW FILES Command</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/show-tables-command/">SHOW TABLES Command</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/use-command/">USE Command</a></li>
+
+ </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="/docs/case/">CASE</a></li>
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+ <li class="toctree-l1"><a href="javascript: void(0);">Data Sources and File Formats</a></li>
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+ <li class="toctree-l2"><a class="reference internal" href="/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="/docs/hive-to-drill-data-type-mapping/">Hive-to-Drill Data Type Mapping</a></li>
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+ <li class="toctree-l2"><a class="reference internal" href="/docs/parquet-format/">Parquet Format</a></li>
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+ <li class="toctree-l2"><a class="reference internal" href="/docs/json-data-model/">JSON Data Model</a></li>
+
+
+ </ul>
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+ <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-connections-on-linux-and-mac-os-x/">Configuring Connections on Linux and Mac OS X</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/driver-configuration-options/">Driver Configuration Options</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/using-a-connection-string/">Using a Connection String</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/advanced-properties/">Advanced Properties</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/testing-the-odbc-connection/">Testing the ODBC Connection</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Using ODBC on Windows</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-windows/">Installing the Driver on Windows</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-connections-on-windows/">Configuring Connections on Windows</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/connecting-to-odbc-data-sources/">Connecting to ODBC Data Sources</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/tableau-examples/">Tableau Examples</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/using-drill-explorer-on-windows/">Using Drill Explorer on Windows</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/using-microstrategy-analytics-with-drill/">Using MicroStrategy Analytics with Drill</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Query Data</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/query-data-introduction/">Query Data Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Querying a File System</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/querying-a-file-system-introduction/">Querying a File System Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/querying-json-files/">Querying JSON Files</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/querying-parquet-files/">Querying Parquet Files</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/querying-plain-text-files/">Querying Plain Text Files</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/querying-directories/">Querying Directories</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/querying-hbase/">Querying HBase</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Querying Complex Data</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/querying-complex-data-introduction/">Querying Complex Data Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/sample-data-donuts/">Sample Data: Donuts</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-flat-data/">Selecting Flat Data</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/using-sql-functions-clauses-and-joins/">Using SQL Functions, Clauses, and Joins</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-nested-data-for-a-column/">Selecting Nested Data for a Column</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-multiple-columns-within-nested-data/">Selecting Multiple Columns Within Nested Data</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/querying-hive/">Querying Hive</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/querying-the-information-schema/">Querying the INFORMATION SCHEMA</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/querying-system-tables/">Querying System Tables</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">SQL Reference</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/sql-reference-introduction/">SQL Reference Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Data Types</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/supported-data-types/">Supported Data Types</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/date-time-and-timestamp/">Date, Time, and Timestamp</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/handling-different-data-types/">Handling Different Data Types</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/lexical-structure/">Lexical Structure</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/operators/">Operators</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL Functions</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/about-sql-function-examples/">About SQL Function Examples</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/math-and-trig/">Math and Trig</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/data-type-conversion/">Data Type Conversion</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/date-time-functions-and-arithmetic/">Date/Time Functions and Arithmetic</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/string-manipulation/">String Manipulation</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/aggregate-and-aggregate-statistical/">Aggregate and Aggregate Statistical</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/functions-for-handling-nulls/">Functions for Handling Nulls</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Nested Data Functions</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/nested-data-limitations/">Nested Data Limitations</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/flatten/">FLATTEN</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/kvgen/">KVGEN</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/repeated-count/">REPEATED_COUNT</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/repeated-contains/">REPEATED_CONTAINS</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/query-directory-functions/">Query Directory Functions</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL Commands</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/supported-sql-commands/">Supported SQL Commands</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/alter-session-command/">ALTER SESSION Command</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/alter-system-command/">ALTER SYSTEM Command</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/create-table-as-ctas-command/">CREATE TABLE AS (CTAS) command</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/create-view-command/">CREATE VIEW command</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/describe-command/">DESCRIBE Command</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/explain-commands/">EXPLAIN commands</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/select-statements/">SELECT Statements</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/show-databases-and-show-schemas-command/">SHOW DATABASES AND SHOW SCHEMAS Command</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/show-files-command/">SHOW FILES Command</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/show-tables-command/">SHOW TABLES Command</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/use-command/">USE Command</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL Conditional Expressions</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/case/">CASE</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/reserved-keywords/">Reserved Keywords</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/sql-extensions/">SQL Extensions</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Data Sources and File Formats</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/data-sources-and-file-formats-introduction/">Data Sources and File Formats Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/hive-to-drill-data-type-mapping/">Hive-to-Drill Data Type Mapping</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/deploying-and-using-a-hive-udf/">Deploying and Using a Hive UDF</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/parquet-format/">Parquet Format</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/json-data-model/">JSON Data Model</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Develop Custom Functions</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/develop-custom-functions-introduction/">Develop Custom Functions Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/develop-a-simple-function/">Develop a Simple Function</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/developing-an-aggregate-function/">Developing an Aggregate Function</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/adding-custom-functions-to-drill/">Adding Custom Functions to Drill</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/using-custom-functions-in-queries/">Using Custom Functions in Queries</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/custom-function-interfaces/">Custom Function Interfaces</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Manage Drill</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/manage-drill-introduction/">Manage Drill Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-drill-in-a-dedicated-cluster/">Configuring Drill in a Dedicated Cluster</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 href="javascript: void(0);">Configuration Options</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/configuration-options-introduction/">Configuration Options Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/start-up-options/">Start-Up Options</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/planning-and-execution-options/">Planning and Execution Options</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/persistent-configuration-storage/">Persistent Configuration Storage</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/starting-stopping-drill/">Starting/Stopping Drill</a></li>
+
+
+
+ <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/partition-pruning/">Partition Pruning</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/monitoring-and-canceling-queries-in-the-drill-web-ui/">Monitoring and Canceling Queries in the Drill Web UI</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Developer Information</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Develop Drill</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/compiling-drill-from-source/">Compiling Drill from Source</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/drill-patch-review-tool/">Drill Patch Review Tool</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Contribute to Drill</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/apache-drill-contribution-guidelines/">Apache Drill Contribution Guidelines</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/apache-drill-contribution-ideas/">Apache Drill Contribution Ideas</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Design Docs</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/drill-plan-syntax/">Drill Plan Syntax</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/rpc-overview/">RPC Overview</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/query-stages/">Query Stages</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/useful-research/">Useful Research</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/docs/value-vectors/">Value Vectors</a></li>
+
+ </ul>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Release Notes</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-5-0-release-notes/">Apache Drill 0.5.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-4-0-release-notes/">Apache Drill 0.4.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache Drill M1 Release Notes (Apache Drill Alpha)</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache Drill M1 Release Notes (Apache Drill Alpha)</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-6-0-release-notes/">Apache Drill 0.6.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-7-0-release-notes/">Apache Drill 0.7.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-8-0-release-notes/">Apache Drill 0.8.0 Release Notes</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Sample Datasets</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/aol-search/">AOL Search</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/enron-emails/">Enron Emails</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/wikipedia-edit-history/">Wikipedia Edit History</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Archived Pages</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/how-to-run-the-drill-demo/">How to Run the Drill Demo</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/what-is-apache-drill/">What is Apache Drill</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Progress Reports</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/docs/2014-q1-drill-report/">2014 Q1 Drill Report</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a class="reference internal" href="/docs/project-bylaws/">Project Bylaws</a></li>
+
+
+ </ul>
+
+ </div>
+ </div>
+</aside>
+
+
+ <nav class="breadcrumbs">
+ <li><a href="/docs/">Docs</a></li>
+
+
+ <li><a href="/docs/architecture/">Architecture</a></li>
+
+ <li>Core Modules</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/architecture/020-core-modules.md" target="_blank"><i class="fa fa-pencil-square-o"></i></a>
+
+
+ <div class="int_title">
+ <h1>Core Modules</h1>
+
+ </div>
+
+ <link href="/css/docpage.css" rel="stylesheet" type="text/css">
+
+ <div class="int_text" align="left">
+
+ <p>The following image represents components within each Drillbit:</p>
+
+<p><img src="/docs/img/DrillbitModules.png" alt="drill query flow"></p>
+
+<p>The following list describes the key components of a Drillbit:</p>
+
+<ul>
+<li><p><strong>RPC end point</strong>: Drill exposes a low overhead protobuf-based RPC protocol to communicate with the clients. Additionally, a C++ and Java API layers are also available for the client applications to interact with Drill. Clients can communicate to a specific Drillbit directly or go through a ZooKeeper quorum to discover the available Drillbits before submitting queries. It is recommended that the clients always go through ZooKeeper to shield clients from the intricacies of cluster management, such as the addition or removal of nodes. </p></li>
+<li><p><strong>SQL parser</strong>: Drill uses Optiq, the open source framework, to parse incoming queries. The output of the parser component is a language agnostic, computer-friendly logical plan that represents the query. </p></li>
+<li><p><strong>Storage plugin interfaces</strong>: Drill serves as a query layer on top of several data sources. Storage plugins in Drill represent the abstractions that Drill uses to interact with the data sources. Storage plugins provide Drill with the following information:</p>
+
+<ul>
+<li>Metadata available in the source</li>
+<li>Interfaces for Drill to read from and write to data sources</li>
+<li>Location of data and a set of optimization rules to help with efficient and faster execution of Drill queries on a specific data source </li>
+</ul>
+
+<p>In the context of Hadoop, Drill provides storage plugins for files and
+HBase/M7. Drill also integrates with Hive as a storage plugin since Hive
+provides a metadata abstraction layer on top of files, HBase/M7, and provides
+libraries to read data and operate on these sources (Serdes and UDFs).</p>
+
+<p>When users query files and HBase/M7 with Drill, they can do it directly or go
+through Hive if they have metadata defined there. Drill integration with Hive
+is only for metadata. Drill does not invoke the Hive execution engine for any
+requests.</p></li>
+<li><p><strong>Distributed cache</strong>: Drill uses a distributed cache to manage metadata (not the data) and configuration information across various nodes. Sample metadata information that is stored in the cache includes query plan fragments, intermediate state of the query execution, and statistics. Drill uses Infinispan as its cache technology.</p></li>
+</ul>
+
+
+
+ <div class="doc-nav">
+
+ <span class="previous-toc"><a href="/docs/architecture-introduction/">← Architecture Introduction</a></span><span class="next-toc"><a href="/docs/architectural-highlights/">Architectural Highlights →</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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