gatorsmile commented on a change in pull request #25258: [SPARK-19712][SQL]
Move subquery rewrite to beginning of optimizer
URL: https://github.com/apache/spark/pull/25258#discussion_r310241531
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -187,9 +187,8 @@ abstract class Optimizer(sessionCatalog: SessionCatalog)
// "Extract PythonUDF From JoinCondition".
Batch("Check Cartesian Products", Once,
CheckCartesianProducts) :+
- Batch("RewriteSubquery", Once,
- RewritePredicateSubquery,
- ColumnPruning,
+ Batch("Final Column Pruning", Once,
Review comment:
Why this is still required.
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