Github user xuanyuanking commented on a diff in the pull request:
https://github.com/apache/spark/pull/22326#discussion_r216127710
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1202,15 +1243,38 @@ object PushPredicateThroughJoin extends
Rule[LogicalPlan] with PredicateHelper {
split(joinCondition.map(splitConjunctivePredicates).getOrElse(Nil), left, right)
joinType match {
- case _: InnerLike | LeftSemi =>
- // push down the single side only join filter for both sides sub
queries
- val newLeft = leftJoinConditions.
- reduceLeftOption(And).map(Filter(_, left)).getOrElse(left)
- val newRight = rightJoinConditions.
- reduceLeftOption(And).map(Filter(_, right)).getOrElse(right)
- val newJoinCond = commonJoinCondition.reduceLeftOption(And)
+ case LeftSemi =>
+ val (newLeft, newRight, newJoinCond, others) =
getNewChildAndSplitCondForJoin(
+ j, leftJoinConditions, rightJoinConditions,
commonJoinCondition)
+ // need to add cross join when unevaluable condition exists
+ val newJoinType = if (others.nonEmpty) {
+ tryToGetCrossType(commonJoinCondition, j)
+ } else {
+ joinType
+ }
- Join(newLeft, newRight, joinType, newJoinCond)
+ val join = Join(newLeft, newRight, newJoinType, newJoinCond)
+ if (others.nonEmpty) {
+ Project(newLeft.output.map(_.toAttribute),
Filter(others.reduceLeft(And), join))
--- End diff --
Could I try to answer this? The projection only used in a left semi join
after cross join in this scenario for ensuring it only contains left side
attributes.
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