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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-1694) Accelerate GROUP BY execution using indexes
Date Sat, 05 Apr 2014 22:18:15 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13961262#comment-13961262
] 

Lefty Leverenz commented on HIVE-1694:
--------------------------------------

This added the *hive.optimize.index.groupby* configuration property in Hive 0.8.1 (branch08r2).

> 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
>             Fix For: 0.8.0
>
>         Attachments: HIVE-1694.1.patch.txt, HIVE-1694.2.patch.txt, HIVE-1694.3.patch.txt,
HIVE-1694.4.patch, HIVE-1694.5.patch, HIVE-1694.6.patch, HIVE-1694.7.patch, HIVE-1694.7.patch,
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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