Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/20816#discussion_r175578334
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -669,11 +672,42 @@ object InferFiltersFromConstraints extends
Rule[LogicalPlan] with PredicateHelpe
val newConditionOpt = conditionOpt match {
case Some(condition) =>
val newFilters = additionalConstraints --
splitConjunctivePredicates(condition)
- if (newFilters.nonEmpty) Option(And(newFilters.reduce(And),
condition)) else None
+ if (newFilters.nonEmpty) Option(And(newFilters.reduce(And),
condition)) else conditionOpt
case None =>
additionalConstraints.reduceOption(And)
}
- if (newConditionOpt.isDefined) Join(left, right, joinType,
newConditionOpt) else join
+ // Infer filter for left/right outer joins
+ val newLeftOpt = joinType match {
+ case RightOuter if newConditionOpt.isDefined =>
+ val rightConstraints = right.constraints.union(
+ splitConjunctivePredicates(newConditionOpt.get).toSet)
+ val inferredConstraints = ExpressionSet(
+
QueryPlanConstraints.inferAdditionalConstraints(rightConstraints))
+ val leftConditions = inferredConstraints
--- End diff --
yeah, let us use `ExpressionSet `
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