caoxuewen created SPARK-23356:
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Summary: 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
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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