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From "Russell Melick (JIRA)" <>
Subject [jira] Updated: (HIVE-1644) use filter pushdown for automatically accessing indexes
Date Fri, 18 Mar 2011 03:18:39 GMT


Russell Melick updated HIVE-1644:

    Attachment: HIVE-1644.8.patch


Fixed unit tests per John and Yonqiang.  Cleaned up comments.  Ready for review.  I still
have a few questions that are probably best answered in the review:

 * When we have multiple indexes, and we get different tasks lists from querying each index,
what should we do?  Right now we use all tasks (
 * Is it possible to improve the regex we use so that it only matches WHERE clauses?  Right
now we use FIL to get to the WHERE (
 * What comparison operators should we support?  Right now it's only <, >, and =.  We
don't have <= or >= (

Should I put this into the reviewboard?

> use filter pushdown for automatically accessing indexes
> -------------------------------------------------------
>                 Key: HIVE-1644
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Indexing
>    Affects Versions: 0.7.0
>            Reporter: John Sichi
>            Assignee: Russell Melick
>         Attachments: HIVE-1644.1.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-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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