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Date: Fri, 4 Feb 2011 00:45:23 +0000 (UTC)
From: "John Sichi (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <2115808641.82.1296780323076.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] Updated: (HIVE-1694) Accelerate GROUP BY execution using
 indexes
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     [ https://issues.apache.org/jira/browse/HIVE-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John Sichi updated HIVE-1694:
-----------------------------

    Description: 
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. 

  was:

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. 

        Summary: Accelerate GROUP BY execution using indexes  (was: Accelerate query execution using indexes)

> 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: Nikhil Deshpande
>         Attachments: HIVE-1694.1.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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