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https://issues.apache.org/jira/browse/HIVE-23806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17152623#comment-17152623
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Yushi Hayasaka commented on HIVE-23806:
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Hello, I think this change does not improve the performance in case of dropping
column, right?
> Avoid clearing column stat states in all partition in case schema is extended
> -----------------------------------------------------------------------------
>
> Key: HIVE-23806
> URL: https://issues.apache.org/jira/browse/HIVE-23806
> Project: Hive
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> in case there are many partitions; adding a new column without cascade may
> take a while - because we want to make sure in schema evolution cases that we
> don't reuse stats later-on by mistake...
> however this is not neccessary in case the schema is extended
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