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https://issues.apache.org/jira/browse/HIVE-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005045#comment-13005045
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Prajakta Kalmegh commented on HIVE-1694:
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Hi John
Please find attached the patch with new index type support. We have also made
changes to the our optimizer code to use count of indexed columns from this new
index type (instead of computing the size(_offsets)). Can you please upload it
for review on ReviewBoard?
Thanks.
> 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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