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https://issues.apache.org/jira/browse/HIVE-23959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17177586#comment-17177586
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Yushi Hayasaka commented on HIVE-23959:
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[~kgyrtkirk]
Thanks for the reply! I understood the key point and also confirmed the
performance was improved through the test, replacing columns with a table which
has 500000+ partitions (timeout on HS2 -> 200 seconds after applying), on my
environment. I was also concerned about calling `getPartitions` (slow
function), but I found it did not call if we enabled the direct sql feature on
this patch. Good!
> Provide an option to wipe out column stats for partitioned tables in case of
> column removal
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-23959
> URL: https://issues.apache.org/jira/browse/HIVE-23959
> Project: Hive
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> in case of column removal / replacement - an update for each partition is
> neccessary; which could take a while.
> goal here is to provide an option to switch to the bulk removal of column
> statistics instead of working hard to retain as much as possible from the old
> stats.
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