Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/17568#discussion_r111678668
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/objects.scala
---
@@ -96,3 +98,23 @@ object CombineTypedFilters extends Rule[LogicalPlan] {
}
}
}
+
+/**
+ * Removes MapObjects when the following conditions are satisfied
+ * 1. Mapobject(e) where e is lambdavariable(), which means types for
input output
+ * are primitive types
+ * 2. no custom collection class specified
+ * representation of data item. For example back to back map operations.
+ */
+object EliminateMapObjects extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan transform {
+ case _ @ DeserializeToObject(Invoke(
+ MapObjects(_, _, _, Cast(LambdaVariable(_, _, dataType, _),
castDataType, _),
--- End diff --
Yes, I eliminate `Cast` in this rule, too. This `Cast` seems to be added
very recently in earlier phase.
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