viirya commented on a change in pull request #28988:
URL: https://github.com/apache/spark/pull/28988#discussion_r449893135
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
##########
@@ -174,9 +176,12 @@ 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) }
+ dedupNestedFields.map(_.canonicalized.asInstanceOf[ExtractValue])
Review comment:
Due to cosmetic variations, Extractors with different qualifiers, for
example, will cause incorrect total number of fields.
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