mgaido91 commented on a change in pull request #23562: [SPARK-26619][SQL] Prune
the unused serializers from SerializeFromObject
URL: https://github.com/apache/spark/pull/23562#discussion_r248304545
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
##########
@@ -562,9 +562,8 @@ object ColumnPruning extends Rule[LogicalPlan] {
d.copy(child = prunedChild(child, d.references))
case p @ Project(_, s: SerializeFromObject) if p.references != s.outputSet
=>
- val prunedSerializer = s.serializer.filter { expr =>
- p.references.contains(expr.toAttribute)
- }
+ val usedRefs = p.references
+ val prunedSerializer = s.serializer.filter(e =>
usedRefs.contains(e.toAttribute))
Review comment:
nit: why `toAttribute`? I think it is not needed (see
https://github.com/apache/spark/blob/cf133e611020ed178f90358464a1b88cdd9b7889/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/AttributeSet.scala#L79)
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