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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5831) filter input files for bucketed tables
Date Tue, 02 May 2017 00:39:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15991898#comment-15991898
] 

Xuefu Zhang commented on HIVE-5831:
-----------------------------------

Great! Thanks for the info, [~gopalv]!

> filter input files for bucketed tables
> --------------------------------------
>
>                 Key: HIVE-5831
>                 URL: https://issues.apache.org/jira/browse/HIVE-5831
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Rui Li
>         Attachments: hive-5831.patch
>
>
> When the users query a bucketed table and use the bucketed column in the predicate, only
the buckets that satisfy the predicate need to be scanned, thus improving the performance.
> Given a table test:
> CREATE TABLE test (x INT, y STRING) CLUSTERED BY ( x ) INTO 10 BUCKETS;
> The following query only has to scan bucket 5:
> SELECT * FROM test WHERE x=5;



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