[jira] [Commented] (HIVE-1694) Accelerate GROUP BY execution using indexes

["jiraposter@reviews.apache.org (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13071130#comment-13071130 ] 

jiraposter@reviews.apache.org commented on HIVE-1694:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/1194/
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Review request for hive and John Sichi.


Summary
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This patch has defined a new AggregateIndexHandler which is used to optimize the query plan for groupby queries. 


This addresses bug HIVE-1694.
    https://issues.apache.org/jira/browse/HIVE-1694


Diffs
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  common/src/java/org/apache/hadoop/hive/conf/HiveConf.java b46976f 
  ql/src/java/org/apache/hadoop/hive/ql/index/AggregateIndexHandler.java PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/index/HiveIndex.java 591c9ff 
  ql/src/java/org/apache/hadoop/hive/ql/metadata/Hive.java 2ca63b3 
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/Optimizer.java 590d69a 
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/index/RewriteCanApplyCtx.java PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/index/RewriteCanApplyProcFactory.java PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/index/RewriteGBUsingIndex.java PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/index/RewriteParseContextGenerator.java PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/index/RewriteQueryUsingAggregateIndex.java PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/index/RewriteQueryUsingAggregateIndexCtx.java PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/parse/BaseSemanticAnalyzer.java 77a6dc6 
  ql/src/test/queries/clientpositive/ql_rewrite_gbtoidx.q PRE-CREATION 
  ql/src/test/results/clientpositive/ql_rewrite_gbtoidx.q.out PRE-CREATION 

Diff: https://reviews.apache.org/r/1194/diff


Testing
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Thanks,

Prajakta



> Accelerate GROUP BY execution using indexes
> -------------------------------------------
>
>                 Key: HIVE-1694
>                 URL: https://issues.apache.org/jira/browse/HIVE-1694
>             Project: Hive
>          Issue Type: New Feature
>          Components: Indexing, Query Processor
>    Affects Versions: 0.7.0
>            Reporter: Nikhil Deshpande
>            Assignee: Prajakta Kalmegh
>         Attachments: HIVE-1694.1.patch.txt, HIVE-1694.2.patch.txt, HIVE-1694.3.patch.txt, HIVE-1694_2010-10-28.diff, demo_q1.hql, demo_q2.hql
>
>
> The index building patch (Hive-417) is checked into trunk, this JIRA issue tracks supporting indexes in Hive compiler & execution engine for SELECT queries.
> This is in ref. to John's comment at
> https://issues.apache.org/jira/browse/HIVE-417?focusedCommentId=12884869&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12884869
> on creating separate JIRA issue for tracking index usage in optimizer & query execution.
> The aim of this effort is to use indexes to accelerate query execution (for certain class of queries). E.g.
> - Filters and range scans (already being worked on by He Yongqiang as part of HIVE-417?)
> - Joins (index based joins)
> - Group By, Order By and other misc cases
> The proposal is multi-step:
> 1. Building index based operators, compiler and execution engine changes
> 2. Optimizer enhancements (e.g. cost-based optimizer to compare and choose between index scans, full table scans etc.)
> This JIRA initially focuses on the first step. This JIRA is expected to hold the information about index based plans & operator implementations for above mentioned cases. 

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