cloud-fan commented on code in PR #45819:
URL: https://github.com/apache/spark/pull/45819#discussion_r1575749860
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CollationTypeCasts.scala:
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@@ -118,17 +121,21 @@ object CollationTypeCasts extends TypeCoercionRule {
)
// Only implicit or default collations present
case 0 =>
- val implicitTypes = expr.map(_.dataType)
+ val implicitTypes = expr.filter {
+ case Literal(_, _: StringType) => false
+ case Cast(child, _: StringType, _, _) =>
child.dataType.isInstanceOf[StringType]
Review Comment:
oh wait, if users use scala/python DataFrame to cast a column to a
StringType with specific collation, should it be explicit collation?
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