Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13893#discussion_r73305098
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala
---
@@ -64,10 +64,17 @@ object PhysicalOperation extends PredicateHelper {
val substitutedFields =
fields.map(substitute(aliases)).asInstanceOf[Seq[NamedExpression]]
(Some(substitutedFields), filters, other,
collectAliases(substitutedFields))
- case Filter(condition, child) if condition.deterministic =>
+ case Filter(condition, child) =>
val (fields, filters, other, aliases) =
collectProjectsAndFilters(child)
- val substitutedCondition = substitute(aliases)(condition)
- (fields, filters ++
splitConjunctivePredicates(substitutedCondition), other, aliases)
+
+ // Deterministic parts of filter condition placed before
non-deterministic predicates could
+ // be pushed down safely.
+ val (pushDown, rest) =
--- End diff --
after an offline discussion with @liancheng , we think it would be better
to have a wrapper node for scan(table scan or file scan), and this wrapper node
can also hold project list and filter conditions. Then in optimizer we can
improve the ColumnPrunning and FilterPushdown rules to push down into this
wrapper node. After this we don't need `PhysicalOperator` anymore and the
planner can match on the wrapper node directly.
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