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https://issues.apache.org/jira/browse/HIVE-24334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HIVE-24334:
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Labels: pull-request-available (was: )
> SyntheticJoinPredicate creation may be missed when ReduceSink has Join input
> ----------------------------------------------------------------------------
>
> Key: HIVE-24334
> URL: https://issues.apache.org/jira/browse/HIVE-24334
> Project: Hive
> Issue Type: Improvement
> Components: Physical Optimizer
> Reporter: Krisztian Kasa
> Assignee: Krisztian Kasa
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Let assume we have a plan where some Reduce Sink operators has a Join
> operator as input:
> {code}
> TS[33]-FIL[34]-SEL[35]-RS[42]-JOIN[44]-RS[45]-JOIN[47]
> TS[36]-FIL[37]-SEL[38]-RS[43]-JOIN[44]
> TS[39]-FIL[40]-SEL[41]-RS[46]-JOIN[47]
> {code}
> RS[45] inputs is JOIN[44].
> When searching for additional opportunities to create additionalÂ
> SyntheticJoinPredicates _ExprNodeDescUtils.backtrack_ does not return the
> input expression of the expression in the join operator but the expression
> itself.
> This is caused by
> - if the operator is a join operator where we create the join predicate
> derivatives the expression is not resolved
> https://github.com/apache/hive/blob/375433510b73c5a22bde4e13485dfc16eaa24706/ql/src/java/org/apache/hadoop/hive/ql/ppd/SyntheticJoinPredicate.java#L400
> - later the backtrack algorithm does the resolution of the expression doesn't
> do any iterations since it is already in a terminal state when it is called
> https://github.com/apache/hive/blob/375433510b73c5a22bde4e13485dfc16eaa24706/ql/src/java/org/apache/hadoop/hive/ql/ppd/SyntheticJoinPredicate.java#L414
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