amaliujia commented on code in PR #38631:
URL: https://github.com/apache/spark/pull/38631#discussion_r1020563219
##########
connector/connect/src/main/scala/org/apache/spark/sql/connect/planner/SparkConnectPlanner.scala:
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@@ -334,7 +334,11 @@ class SparkConnectPlanner(session: SparkSession) {
}
private def transformAlias(alias: proto.Expression.Alias): NamedExpression =
{
- Alias(transformExpression(alias.getExpr), alias.getName)()
+ if (alias.getNameCount == 1) {
+ Alias(transformExpression(alias.getExpr), alias.getName(0))()
+ } else {
+ MultiAlias(transformExpression(alias.getExpr),
alias.getNameList.asScala.toSeq)
Review Comment:
I actually expect Scala client will re-use Connect DSL.
if you take a closer look, Connect DSL is DataFrame like internal API that
offers `toProto` logic (equivalent to `plan.py` for python).
Anything adding to the DSL will not only help testing coverage but also help
Scala client potentially.
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