cloud-fan commented on code in PR #48663:
URL: https://github.com/apache/spark/pull/48663#discussion_r1848235766
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CollationTypeCoercion.scala:
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@@ -193,88 +144,208 @@ object CollationTypeCoercion {
case other => other
}
+ /**
+ * If childType is collated and target is UTF8_BINARY, the collation of the
output
+ * should be that of the childType.
+ */
+ private def shouldRemoveCast(cast: Cast): Boolean = {
+ val isUserDefined = cast.getTagValue(Cast.USER_SPECIFIED_CAST).isDefined
+ val isChildTypeCollatedString = cast.child.dataType match {
Review Comment:
do we need this condition? If the child is utf8 collation, we can remove the
cast as well as the target type is also utf8 collation.
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