Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/12820#discussion_r61688622
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -99,16 +99,17 @@ abstract class Optimizer(sessionCatalog:
SessionCatalog, conf: CatalystConf)
EliminateSorts,
SimplifyCasts,
SimplifyCaseConversionExpressions,
- EliminateSerialization,
- RewritePredicateSubquery) ::
+ EliminateSerialization) ::
Batch("Decimal Optimizations", fixedPoint,
DecimalAggregates) ::
Batch("Typed Filter Optimization", fixedPoint,
EmbedSerializerInFilter) ::
Batch("LocalRelation", fixedPoint,
ConvertToLocalRelation) ::
Batch("OptimizeCodegen", Once,
- OptimizeCodegen(conf)) :: Nil
+ OptimizeCodegen(conf)) ::
+ Batch("RewriteSubquery", Once,
+ RewritePredicateSubquery) :: Nil
--- End diff --
We sometime add a top-level project to make sure all attributes are unique;
which is a tiny bit of overhead. Shouldn't we add
`ColumnPruning`/`ColapseProjects` to this batch?
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