cloud-fan commented on a change in pull request #30421:
URL: https://github.com/apache/spark/pull/30421#discussion_r583466821
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
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@@ -505,10 +505,14 @@ class AstBuilder extends SqlBaseBaseVisitor[AnyRef] with
SQLConfHelper with Logg
protected def visitStringConstant(
ctx: ConstantContext,
legacyNullAsString: Boolean): String = withOrigin(ctx) {
- ctx match {
- case _: NullLiteralContext if !legacyNullAsString => null
- case s: StringLiteralContext => createString(s)
- case o => o.getText
+ expression(ctx) match {
+ case Literal(null, _) if !legacyNullAsString => null
+ case l @ Literal(null, _) => l.toString
+ case l: Literal =>
Review comment:
can we add a TODO here? For v2 commands, we will cast the string back to
its actual value, which is a waste and can be improved in the future.
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