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From "Namit Jain (JIRA)" <>
Subject [jira] [Commented] (HIVE-1644) use filter pushdown for automatically accessing indexes
Date Wed, 23 Mar 2011 20:35:06 GMT


Namit Jain commented on HIVE-1644:

Also, can you add another check - only use the index if the size of the input is greater than
a certain
size (5G - make it configurable). This can be a check per index type - bitmap indices can
have a similar

As Yongqiang said, 3. can be a follow-up task.

> 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-1644.10.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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