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https://issues.apache.org/jira/browse/HIVE-23959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17175578#comment-17175578
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Zoltan Haindrich commented on HIVE-23959:
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[~yhaya]: sorry, I missed your comment.
Yes, the key difference when this feature is enabled that carefull 1-by-1
partition update is skipped - instead; it will remove all column statistics for
all partitions of the table. It will only execute a few queries - independently
from the number of partitions - so it will be quick.
> 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
> 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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