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From "Namit Jain (JIRA)" <>
Subject [jira] Commented: (HIVE-735) Queries should be optimized with pre-ordered column
Date Fri, 07 Aug 2009 14:39:14 GMT


Namit Jain commented on HIVE-735:

+1 on this idea - this should bring down the scan volume substantially

> Queries should be optimized with pre-ordered column
> ---------------------------------------------------
>                 Key: HIVE-735
>                 URL:
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: He Yongqiang
> If a table has one or some pre-ordered columns and a query has filters(range/point) on
these columns. Hive should take advantage of the order information, and only read the needed
blocks instead of touching the whole file.  And this will also be useful for sorted summary
table index.

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