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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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Wenchen Fan reassigned SPARK-23356:
-----------------------------------
Assignee: caoxuewen
> 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: caoxuewen
> 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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