Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14619#discussion_r74895818
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1636,6 +1638,30 @@ object ReplaceExceptWithAntiJoin extends
Rule[LogicalPlan] {
}
/**
+ * Insert a [[Scanner]] operator over [[MultiInstanceRelation]], then
combine [[Project]]s and
+ * [[Filter]]s with this operator, then the planner can match on the
[[Scanner]] node directly.
+ */
+object InsertRelationScanner extends Rule[LogicalPlan] with
PredicateHelper {
--- End diff --
This doesn't reuse the existing `ColumnPruning` and `PushDownPredicate`
rules. I'd like to add the wrapper at the very beginning, e.g.
`SessionCatalog.lookUpRelation`.
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