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https://issues.apache.org/jira/browse/HIVE-28807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17971390#comment-17971390
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Denys Kuzmenko commented on HIVE-28807:
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Merged to master.
Thanks for the fix [~seonggon]!
> Hive fails to print user level explain when a vertex has multiple join
> operators and its top operator is dynamic partition hash join.
> -------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-28807
> URL: https://issues.apache.org/jira/browse/HIVE-28807
> Project: Hive
> Issue Type: Bug
> Reporter: Seonggon Namgung
> Assignee: Seonggon Namgung
> Priority: Minor
> Labels: pull-request-available
>
> I found that Hive occasionally fails to print the user level explain due to
> the following exception:
> {code:java}
> java.lang.Exception: Can not find the source operator on one of the branches
> of map join.
> at org.apache.hadoop.hive.common.jsonexplain.Op.inlineJoinOp(Op.java:173)
> ~[hive-common-4.0.0.jar:4.0.0]
> at org.apache.hadoop.hive.common.jsonexplain.Op.print(Op.java:316)
> ~[hive-common-4.0.0.jar:4.0.0]
> at org.apache.hadoop.hive.common.jsonexplain.Op.print(Op.java:347)
> ~[hive-common-4.0.0.jar:4.0.0]
> at org.apache.hadoop.hive.common.jsonexplain.Op.print(Op.java:347)
> ~[hive-common-4.0.0.jar:4.0.0] {code}
> This happens when a reducer vertex contains multiple join operators, and its
> top operator is DPHJ.
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