Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18023#discussion_r126609171
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
---
@@ -1260,26 +1260,51 @@ class AstBuilder(conf: SQLConf) extends
SqlBaseBaseVisitor[AnyRef] with Logging
CaseWhen(branches, Option(ctx.elseExpression).map(expression))
}
+ private def canApplyRegex(ctx: ParserRuleContext): Boolean =
withOrigin(ctx) {
--- End diff --
Please add a comment above this function to explain why `regex` can be
applied under `NamedExpression` only. Thanks!
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