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From "Chaoyu Tang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12053) Stats performance regression caused by HIVE-11786
Date Wed, 07 Oct 2015 23:02:26 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14947764#comment-14947764
] 

Chaoyu Tang commented on HIVE-12053:
------------------------------------

[~sseth] have found that creating following indexes would not help to improve the stats performance
either
{code}
CREATE INDEX COLNAME_TBLID_IDX ON TAB_COL_STATS (COLUMN_NAME, TBL_ID);
CREATE INDEX COLNAME_IDX ON TAB_COL_STATS (COLUMN_NAME);
CREATE INDEX COLNAME_PARTID_IDX ON PART_COL_STATS (COLUMN_NAME, PART_ID);
CREATE INDEX COLNAME_IDX ON PART_COL_STATS (COLUMN_NAME);
CREATE INDEX PARTNAME_IDX ON PARTITIONS (PART_NAME);
CREATE INDEX TBLNAME_IDX ON TBLS (TBL_NAME);
{code}

> Stats performance regression caused by HIVE-11786
> -------------------------------------------------
>
>                 Key: HIVE-12053
>                 URL: https://issues.apache.org/jira/browse/HIVE-12053
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>            Reporter: Chaoyu Tang
>
> HIVE-11786 tried to normalize table TAB_COL_STATS/PART_COL_STATS but caused performance
regression.



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