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https://issues.apache.org/jira/browse/HIVE-19605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16484687#comment-16484687
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Todd Lipcon commented on HIVE-19605:
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Seems the slow query on get_table is due to the "initialization" queries in
ensureDbInit(). This is worked around by HIVE-19310.
However, the API calls that actually are meant to fetch column stats are still
slow and this should be fixed for their sake.
> TAB_COL_STATS table has no index on db/table name
> -------------------------------------------------
>
> Key: HIVE-19605
> URL: https://issues.apache.org/jira/browse/HIVE-19605
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Reporter: Todd Lipcon
> Assignee: Vihang Karajgaonkar
> Priority: Major
>
> The TAB_COL_STATS table is missing an index on (CAT_NAME, DB_NAME,
> TABLE_NAME). The getTableColumnStatistics call queries based on this tuple.
> This makes those queries take a significant amount of time in large
> metastores since they do a full table scan.
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