cloud-fan commented on code in PR #41347:
URL: https://github.com/apache/spark/pull/41347#discussion_r1262350788
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala:
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@@ -271,7 +271,10 @@ case class ScalarSubquery(
mayHaveCountBug: Option[Boolean] = None)
extends SubqueryExpression(plan, outerAttrs, exprId, joinCond, hint) with
Unevaluable {
override def dataType: DataType = {
- assert(plan.schema.fields.nonEmpty, "Scalar subquery should have only one
column")
+ if (!plan.schema.fields.nonEmpty) {
Review Comment:
Can we really reach this code branch?
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