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https://issues.apache.org/jira/browse/HIVE-20109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Shelukhin updated HIVE-20109:
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Attachment: (was: HIVE-20109.nogen.patch)
> get rid of COLUMN_STATS_ACCURATE
> --------------------------------
>
> Key: HIVE-20109
> URL: https://issues.apache.org/jira/browse/HIVE-20109
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Priority: Major
>
> I don't know why anyone would come up with an idea of storing a set of
> booleans in a database using JSON. This has caused various problems in the
> past (text field limitations, perf issues when parsing a giant string; also
> bugs because the way it is set is brittle).
> However, now that we are implementing transactional stats, it becomes
> especially problematic and error prone because the code in Hive sets C_S_A in
> random places with reckless abandon, whereas we want to change the state of
> the stats in well defined places where txn semantics can be verified.
> Currently in HIVE-19416, we are handling random things that touch it (from
> metastore itself to output committers, various stats tasks, commands like
> truncate, etc.) via a pile of hacks, but the best solution would be to remove
> it completely and replace with a DB table/columns in stats tables that would
> need to be set explicitly, not via generic alter_table.
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