cloud-fan commented on code in PR #45422:
URL: https://github.com/apache/spark/pull/45422#discussion_r1530677086
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala:
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@@ -994,8 +994,12 @@ object TypeCoercion extends TypeCoercionBase {
case (StringType, datetime: DatetimeType) => datetime
case (StringType, AnyTimestampType) =>
AnyTimestampType.defaultConcreteType
case (StringType, BinaryType) => BinaryType
+ case (st: StringType, StringType) => st
Review Comment:
reading the code around here, I think `null` means no implicit cast.
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