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https://issues.apache.org/jira/browse/HIVE-15033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15603049#comment-15603049
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Eugene Koifman commented on HIVE-15033:
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this is only for the multi-insert which represents a MERGE statement, in which
case multiple insert branches are writing to the same table/partition.
There is no point computing stats until the whole statement is finished
> Ensure there is only 1 StatsTask in the query plan
> --------------------------------------------------
>
> Key: HIVE-15033
> URL: https://issues.apache.org/jira/browse/HIVE-15033
> Project: Hive
> Issue Type: Sub-task
> Components: Transactions
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
>
> currently there is 1 per WHEN clause
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