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https://issues.apache.org/jira/browse/HIVE-26986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17901905#comment-17901905
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Seonggon Namgung commented on HIVE-26986:
-----------------------------------------
Yes, this patch is still effective for improving performance. The following
changes in qfile output can verify the improvement.
union10.q: Current Hive does not merge Map1, 5, 7; the patch merges them into
one Map.
Current Hive:
[https://github.com/apache/hive/blob/53d13442af33e272cf768549c8e4d4fc53e295f9/ql/src/test/results/clientpositive/llap/union10.q.out#L40-L43]
This patch:
[https://github.com/ngsg/hive/blob/8dc3a1447e4e8477cc73c419d20c2ea328e7afca/ql/src/test/results/clientpositive/llap/union10.q.out#L40-L43]
multiMapJoin2.q: Current Hive produces Reducer6; the patch does not create it.
Current Hive:
[https://github.com/apache/hive/blob/53d13442af33e272cf768549c8e4d4fc53e295f9/ql/src/test/results/clientpositive/llap/multiMapJoin2.q.out#L30-L33]
This patch:
[https://github.com/ngsg/hive/blob/8dc3a1447e4e8477cc73c419d20c2ea328e7afca/ql/src/test/results/clientpositive/llap/multiMapJoin2.q.out#L30-L32]
> A DAG created by OperatorGraph is not equal to the Tez DAG.
> -----------------------------------------------------------
>
> Key: HIVE-26986
> URL: https://issues.apache.org/jira/browse/HIVE-26986
> Project: Hive
> Issue Type: Sub-task
> Affects Versions: 4.0.0-alpha-2
> Reporter: Seonggon Namgung
> Assignee: Seonggon Namgung
> Priority: Major
> Labels: hive-4.1.0-must, pull-request-available
> Attachments: Query71 OperatorGraph.png, Query71 TezDAG.png
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> A DAG created by OperatorGraph is not equal to the corresponding DAG that is
> submitted to Tez.
> Because of this problem, ParallelEdgeFixer reports a pair of normal edges to
> a parallel edge.
> We observe this problem by comparing OperatorGraph and Tez DAG when running
> TPC-DS query 71 on 1TB ORC format managed table.
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