zhengruifeng commented on a change in pull request #35194:
URL: https://github.com/apache/spark/pull/35194#discussion_r813659957
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/joins.scala
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@@ -187,6 +187,23 @@ object EliminateOuterJoin extends Rule[LogicalPlan] with
PredicateHelper {
}
}
+/**
+ * Convert inner join to left semi join.
+ */
+object EliminateInnerJoin extends Rule[LogicalPlan] with PredicateHelper with
JoinSelectionHelper {
+ def apply(plan: LogicalPlan): LogicalPlan = {
+ plan.transformWithPruning(_.containsPattern(INNER_LIKE_JOIN), ruleId) {
+ case p @ Project(_,
+ j @ ExtractEquiJoinKeys(Inner, _, rightKeys, None, _, left, right:
Aggregate, _))
Review comment:
Inner join is symmetrical, can this rule also be applied to inner join
with left `Aggregate` child?
`j @ ExtractEquiJoinKeys(Inner, leftKeys, _, _, None, left: Aggregate, _,
_))`
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