Github user dreamquster commented on a diff in the pull request:
https://github.com/apache/spark/pull/5358#discussion_r32883400
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -171,6 +172,10 @@ object ColumnPruning extends Rule[LogicalPlan] {
Project(substitutedProjection, child)
+ // add a project which is blocked by Generate
+ case p @ pushBelowGenerate(newChild) =>
--- End diff --
Generate block the process of collectProjectsAndFilters in
PhysicalOperation.
Except that Project on top of generate, the expression named Filter may
also be on the top of generate. How to solve this scene?
Project
Filter
Generate(explode)
Are there many Filters between Project and Generate?
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