Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/9959#discussion_r45937024
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -609,6 +609,19 @@ object SimplifyFilters extends Rule[LogicalPlan] {
}
/**
+ * Helper functions for Predicate push down.
+ */
+object PredicateHelper {
+
+ // Substitute any known alias from a map.
+ def replaceAlias(condition: Expression, aliases:
AttributeMap[Expression]): Expression = {
--- End diff --
why not move this to the existing `trait PredicateHelper`?
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