wugx commented on pull request #35476:
URL: https://github.com/apache/spark/pull/35476#issuecomment-1039256874
```scala
private def canApplyRegex(ctx: ParserRuleContext): Boolean =
withOrigin(ctx) {
var parent = ctx.getParent
if(!isRegex(ctx.getText)) return false
while (parent != null) {
if (parent.isInstanceOf[NamedExpressionContext]) return true
parent = parent.getParent
}
return false
}
```
The isRegex function only needs to be called once, If it is not regular, it
can return false directly.
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