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https://issues.apache.org/jira/browse/HIVE-19605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16495414#comment-16495414
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Vihang Karajgaonkar edited comment on HIVE-19605 at 5/30/18 5:21 PM:
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Hi [~tlipcon] I was looking at this and I noticed that the
{{getTableColumnStatistics}} in fact fetches information from {{TAB_COL_STATS}}
using (CAT_NAME, DB_NAME, TBL_NAME, COL_NAME). So the index should also include
COL_NAME unless you think otherwise.
was (Author: vihangk1):
Hi [~tlipcon] I was looking at this and I noticed that the
{{getTableColumnStatistics}} in fact fetches information from {{The
TAB_COL_STATS}} using (CAT_NAME, DB_NAME, TBL_NAME, COL_NAME). So the index
should also include COL_NAME unless you think otherwise.
> 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
> Attachments: HIVE-19605.01.patch
>
>
> 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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