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https://issues.apache.org/jira/browse/HIVE-7811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14118769#comment-14118769
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Eugene Koifman commented on HIVE-7811:
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Actually, it only updates stats on major compactions, but the code is
confusing. I added patch 6 with minor refactoring to make this cleaner.
Unfortunately TestCompactor currently fails because stats data returned is
duplicated. It seems that analyze command on update of stats does another
insert instead of update so the DB contains both the old stats and new stats.
Likely this was broken by HIVE-7876.
> Compactions need to update table/partition stats
> ------------------------------------------------
>
> Key: HIVE-7811
> URL: https://issues.apache.org/jira/browse/HIVE-7811
> Project: Hive
> Issue Type: Sub-task
> Components: Transactions
> Affects Versions: 0.13.1
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
> Attachments: HIVE-7811.3.patch, HIVE-7811.4.patch, HIVE-7811.5.patch,
> HIVE-7811.6.patch
>
>
> Compactions should trigger stats recalculation for columns which already have
> sats.
> https://reviews.apache.org/r/25201/
> Major compactions will cause the Compactor to see which columns already have
> stats and run analyze command for those columns. If compacting a partition
> then stats for that partition will be computed. If table is not partitioned,
> then the whole table.
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