Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/8742#discussion_r39815622
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -136,26 +136,12 @@ object SetOperationPushDown extends Rule[LogicalPlan]
{
Filter(condition, left),
Filter(pushToRight(condition, rewrites), right))
- // Push down projection into intersect
- case Project(projectList, i @ Intersect(left, right)) =>
- val rewrites = buildRewrites(i)
- Intersect(
- Project(projectList, left),
- Project(projectList.map(pushToRight(_, rewrites)), right))
-
// Push down filter into except
case Filter(condition, e @ Except(left, right)) =>
val rewrites = buildRewrites(e)
Except(
Filter(condition, left),
Filter(pushToRight(condition, rewrites), right))
-
- // Push down projection into except
- case Project(projectList, e @ Except(left, right)) =>
- val rewrites = buildRewrites(e)
- Except(
- Project(projectList, left),
- Project(projectList.map(pushToRight(_, rewrites)), right))
--- End diff --
Can you add comments at here the reason that we cannot pushdown projections
and why we can pushdown filters?
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