MaxGekk commented on code in PR #40126:
URL: https://github.com/apache/spark/pull/40126#discussion_r1119846624
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala:
##########
@@ -669,17 +669,26 @@ class AstBuilder extends SqlBaseParserBaseVisitor[AnyRef]
with SQLConfHelper wit
)
}
+ private def getAliasFunc(alias: => String): Option[Expression => String] = {
+ if (conf.getConf(SQLConf.STABLE_DERIVED_COLUMN_ALIAS_ENABLED)) {
+ Some(_ => alias)
+ } else {
+ None
+ }
+ }
+
override def visitNamedExpressionSeq(
- ctx: NamedExpressionSeqContext): Seq[Expression] = {
+ ctx: NamedExpressionSeqContext): Seq[(Expression, Option[Expression =>
String])] = {
Option(ctx).toSeq
.flatMap(_.namedExpression.asScala)
- .map(typedVisit[Expression])
+ .map(ctx => (typedVisit[Expression](ctx),
getAliasFunc(toExprAlias(ctx))))
Review Comment:
Just in case, this function handle not only named expressions but others
too. For example:
```sql
select 1;
```
is handled by `visitNamedExpressionSeq()` but not by `visitExpressionSeq()`.
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