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https://issues.apache.org/jira/browse/SPARK-23356?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-23356:
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    Assignee: Apache Spark

> Pushes Project to both sides of Union when expression is non-deterministic
> --------------------------------------------------------------------------
>
>                 Key: SPARK-23356
>                 URL: https://issues.apache.org/jira/browse/SPARK-23356
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: caoxuewen
>            Assignee: Apache Spark
>            Priority: Major
>
> Currently, PushProjectionThroughUnion optimizer only supports pushdown 
> project operator to both sides of a Union operator when expression is 
> deterministic , in fact, we can be like pushdown filters, also support 
> pushdown project operator to both sides of a Union operator when expression 
> is non-deterministic , this PR description fix this problem。now the explain 
> looks like:
> === Applying Rule 
> org.apache.spark.sql.catalyst.optimizer.PushProjectionThroughUnion ===
> Input LogicalPlan:
> Project [a#0, rand(10) AS rnd#9]
> +- Union
>  :- LocalRelation <empty>, [a#0, b#1, c#2]
>  :- LocalRelation <empty>, [d#3, e#4, f#5]
>  +- LocalRelation <empty>, [g#6, h#7, i#8]
> Output LogicalPlan:
> Project [a#0, rand(10) AS rnd#9]
> +- Union
>  :- Project [a#0]
>  : +- LocalRelation <empty>, [a#0, b#1, c#2]
>  :- Project [d#3]
>  : +- LocalRelation <empty>, [d#3, e#4, f#5]
>  +- Project [g#6]
>  +- LocalRelation <empty>, [g#6, h#7, i#8]



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