Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/15500#discussion_r83781352
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/basicPhysicalOperators.scala
---
@@ -77,9 +77,40 @@ case class ProjectExec(projectList:
Seq[NamedExpression], child: SparkPlan)
}
}
- override def outputOrdering: Seq[SortOrder] = child.outputOrdering
+ override def outputOrdering: Seq[SortOrder] =
+ ProjectHelper.outputOrdering(projectList, child.outputOrdering, child)
}
+object ProjectHelper {
+ /**
+ * Determins the outputOrdering property for [[ProjectExec]] and
[[TakeOrderedAndProjectExec]]
--- End diff --
Yea, looks like it is. If keeping meaningless sort order seems no harm and
we don't require it strictly, we can skip this.
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