HyukjinKwon commented on a change in pull request #24182:
[SPARK-27246][SQL]scalar subquery with no columns throws exception in spark
shell
URL: https://github.com/apache/spark/pull/24182#discussion_r268471195
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
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@@ -248,7 +248,11 @@ case class ScalarSubquery(
children: Seq[Expression] = Seq.empty,
exprId: ExprId = NamedExpression.newExprId)
extends SubqueryExpression(plan, children, exprId) with Unevaluable {
- override def dataType: DataType = plan.schema.fields.head.dataType
+ override def dataType: DataType = if (!plan.schema.fields.isEmpty) {
+ plan.schema.fields.head.dataType
+ } else {
+ NullType
Review comment:
Let's also add a comment that it returns `NullType` for testing purpose.
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