viirya commented on a change in pull request #29027:
URL: https://github.com/apache/spark/pull/29027#discussion_r451202576
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
##########
@@ -132,9 +134,12 @@ object NestedColumnAliasing {
// If all nested fields of `attr` are used, we don't need to introduce
new aliases.
// By default, ColumnPruning rule uses `attr` already.
+ // Note that we need to remove cosmetic variations first, so we only
count a
+ // nested field once.
if (nestedFieldToAlias.nonEmpty &&
- nestedFieldToAlias
- .map { case (nestedField, _) =>
totalFieldNum(nestedField.dataType) }
+ nestedFields.map(_.canonicalized)
Review comment:
Yeah, for the change in `NestedColumnAliasing`. Another difference is
test. One test in master branch cannot pass in branch-3.0.
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