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https://issues.apache.org/jira/browse/HIVE-15033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15648301#comment-15648301
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Eugene Koifman commented on HIVE-15033:
---------------------------------------

This prop causes a new node (stage) to be inserted into the plan that acts like 
a sync point (CyclicBarrier).  It doesn't change the number of MoveTask noes.

> 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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