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https://issues.apache.org/jira/browse/SPARK-25716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-25716.
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Resolution: Fixed
Assignee: SongYadong
Fix Version/s: 3.0.0
> Project and Aggregate generate valid constraints with unnecessary operation
> ---------------------------------------------------------------------------
>
> Key: SPARK-25716
> URL: https://issues.apache.org/jira/browse/SPARK-25716
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: SongYadong
> Assignee: SongYadong
> Priority: Minor
> Fix For: 3.0.0
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Project logical operator generates valid constraints using two opposite
> operations. It substracts child constraints from all constraints, than union
> child constraints again. I think it may be not necessary.
> Aggregate operator has the same problem with Project.
> for example:
> in LogicalPlan.getAliasedConstraints(), return:
> {code:java}
> allConstraints -- child.constraints{code}
> in Project.validConstraints():
> {code:java}
> child.constraints.union(getAliasedConstraints(projectList)){code}
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