gengliangwang commented on code in PR #36703:
URL: https://github.com/apache/spark/pull/36703#discussion_r891136404
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala:
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@@ -1792,15 +1792,16 @@ class AstBuilder extends
SqlBaseParserBaseVisitor[AnyRef] with SQLConfHelper wit
override def visitCast(ctx: CastContext): Expression = withOrigin(ctx) {
val rawDataType = typedVisit[DataType](ctx.dataType())
val dataType =
CharVarcharUtils.replaceCharVarcharWithStringForCast(rawDataType)
- val cast = ctx.name.getType match {
+ ctx.name.getType match {
case SqlBaseParser.CAST =>
- Cast(expression(ctx.expression), dataType)
+ val cast = Cast(expression(ctx.expression), dataType)
+ cast.setTagValue(Cast.USER_SPECIFIED_CAST, true)
+ cast
case SqlBaseParser.TRY_CAST =>
+ // TRY_CAST can only be user-specified and we don't need to set the
Tag.
Review Comment:
I am confused. The default value of `USER_SPECIFIED_CAST` seems to be false.
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