Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17175#discussion_r105342800
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/basicPhysicalOperators.scala
---
@@ -78,9 +78,42 @@ case class ProjectExec(projectList:
Seq[NamedExpression], child: SparkPlan)
}
}
- override def outputOrdering: Seq[SortOrder] = child.outputOrdering
--- End diff --
My original thought is to support the cases where
`requiresChildDistribution` refers nested fields created and aliased in
`Project`, as the example I showed.
The example you give is another kind of case. In order to support, if we
wannt, at least we need to improve expression canonicalization and
partitioning/distribution matching.
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