Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18968#discussion_r134920136
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
---
@@ -274,17 +274,24 @@ object ScalarSubquery {
case class ListQuery(
plan: LogicalPlan,
children: Seq[Expression] = Seq.empty,
- exprId: ExprId = NamedExpression.newExprId)
+ exprId: ExprId = NamedExpression.newExprId,
+ childOutputs: Seq[Attribute] = Seq.empty)
extends SubqueryExpression(plan, children, exprId) with Unevaluable {
- override def dataType: DataType = plan.schema.fields.head.dataType
+ override def dataType: DataType = if (childOutputs.length > 1) {
+ childOutputs.toStructType
+ } else {
+ childOutputs.head.dataType
+ }
+ override lazy val resolved: Boolean = childrenResolved && plan.resolved
&& childOutputs.nonEmpty
--- End diff --
Before we fill in `childOutputs`, this `ListQuery` cannot be resolved.
Otherwise, to access its `dataType` causes failure in `In.checkInputDataTypes`.
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