maropu commented on a change in pull request #28898:
URL: https://github.com/apache/spark/pull/28898#discussion_r446499675
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
##########
@@ -39,6 +39,22 @@ object NestedColumnAliasing {
NestedColumnAliasing.replaceToAliases(plan, nestedFieldToAlias,
attrToAliases)
}
+ /**
+ * This is to solve a `LogicalPlan` like `Project`->`Filter`->`Window`.
+ * In this case, `Window` can be plan that is `canProjectPushThrough`.
+ * By adding this, it allows nested columns to be passed onto next stages.
+ * Currently, not adding `Filter` into `canProjectPushThrough` due to
+ * infinitely loop in optimizers during the predicate push-down rule.
+ */
+
Review comment:
nit: remove this unnecessary blank.
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