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From "John Sichi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-1644) use filter pushdown for automatically accessing indexes
Date Sat, 30 Apr 2011 04:02:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027286#comment-13027286
] 

John Sichi commented on HIVE-1644:
----------------------------------

The correct behavior is to not do any work at all (it would be sad to scan the whole table
when the index already told us there is nothing there).  Setting an empty array of paths didn't
work?

I believe in some cases for other kinds of execution, we create an empty file and scan that.
 I forget where the code for that lives.

> use filter pushdown for automatically accessing indexes
> -------------------------------------------------------
>
>                 Key: HIVE-1644
>                 URL: https://issues.apache.org/jira/browse/HIVE-1644
>             Project: Hive
>          Issue Type: Improvement
>          Components: Indexing
>    Affects Versions: 0.8.0
>            Reporter: John Sichi
>            Assignee: Russell Melick
>         Attachments: HIVE-1644.1.patch, HIVE-1644.10.patch, HIVE-1644.11.patch, HIVE-1644.12.patch,
HIVE-1644.13.patch, HIVE-1644.14.patch, HIVE-1644.15.patch, HIVE-1644.16.patch, HIVE-1644.17.patch,
HIVE-1644.18.patch, HIVE-1644.2.patch, HIVE-1644.3.patch, HIVE-1644.4.patch, HIVE-1644.5.patch,
HIVE-1644.6.patch, HIVE-1644.7.patch, HIVE-1644.8.patch, HIVE-1644.9.patch, hive.log
>
>
> HIVE-1226 provides utilities for analyzing filters which have been pushed down to a table
scan.  The next step is to use these for selecting available indexes and generating access
plans for those indexes.

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