[jira] [Created] (SPARK-23356) Pushes Project to both sides of Union when expression is non-deterministic

["caoxuewen (JIRA)" <ji...@apache.org>]

caoxuewen created SPARK-23356:
---------------------------------

             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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