Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/12138#discussion_r59109073
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -512,24 +512,35 @@ private[sql] object Expand {
* a input row.
*
* @param projections to apply
- * @param output of all projections.
* @param child operator.
*/
case class Expand(
- projections: Seq[Seq[Expression]],
- output: Seq[Attribute],
+ projections: Seq[Seq[NamedExpression]],
child: LogicalPlan) extends UnaryNode {
+ override def output: Seq[Attribute] = {
+ // Take the first projection as output
+ val preOutput = projections.head.map(_.toAttribute)
--- End diff --
This seems a waste that we make all projections `Seq[NamedExpression]`, but
only use the first one to produce attribute.
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