Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/5134#discussion_r29218048
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -115,6 +115,25 @@ object UnionPushdown extends Rule[LogicalPlan] {
*/
object ColumnPruning extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transform {
+ // Eliminate unneeded attributes from Expand that is used in
GroupingSets
+ case a @ Aggregate(groupByExprs, aggregations, e @ Expand(projections,
output, child))
+ if (e.outputSet -- a.references).nonEmpty =>
+
+ val substitution = projections.map { groupExpr =>
+ val newExprs = groupExpr.collect {
+ case x: NamedExpression if a.references.contains(x) => x
+ case l: Literal => l
--- End diff --
Because there are some constant null values and bitmasks we need to keep
them.
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