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https://issues.apache.org/jira/browse/HIVE-15279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15723650#comment-15723650
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Sergey Shelukhin commented on HIVE-15279:
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1) As suggested above, we now take dummy ops from all the works, not just the
main work. However, I am not sure if it's possible for the same dummy to be
added to multiple works given the code (someone might have a picture in their
head of how they are propagated, but to me it looks like it just puts them in
all potentially affected works and hopes for the best, hence all the bugs with
them).
So, hashset it used to make sure we only init each dummy operator once.
2) The main goal of the log line is to tell whether work has any dummy
operators at all. IDs can be used in conjunction with operator tree that is
output elsewhere.
3) Will remove.
> map join dummy operators are not set up correctly in certain cases with merge
> join
> ----------------------------------------------------------------------------------
>
> Key: HIVE-15279
> URL: https://issues.apache.org/jira/browse/HIVE-15279
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-15279.01.patch, HIVE-15279.02.patch,
> HIVE-15279.patch
>
>
> As a result, MapJoin is not initialized and there's NPE later.
> Tez-specific.
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