cloud-fan commented on a change in pull request #24331: [SPARK-19712][SQL]
Pushdown LeftSemi/LeftAnti below join
URL: https://github.com/apache/spark/pull/24331#discussion_r275406297
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/PushDownLeftSemiAntiJoin.scala
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@@ -159,3 +159,102 @@ object PushDownLeftSemiAntiJoin extends
Rule[LogicalPlan] with PredicateHelper {
}
}
}
+
+/**
+ * This rule is a variant of [[PushPredicateThroughJoin]] which can handle
+ * pushing down Left semi and Left Anti joins below a join operator. The
+ * allowable join types are:
+ * 1) Inner
+ * 2) Cross
+ * 3) LeftOuter
+ * 4) RightOuter
+ */
+object PushLeftSemiLeftAntiThroughJoin extends Rule[LogicalPlan] with
PredicateHelper {
+ /**
+ * Define an enumeration to identify whether a LeftSemi/LeftAnti join can be
pushed down to
+ * the left leg or the right leg of the join.
+ */
+ object PushdownDirection extends Enumeration {
+ val toRightBranch, toLeftBranch, none = Value
Review comment:
actually, the policy is upper-case all the letters, e.g.
```
object PushdownDirection extends Enumeration {
val TO_RIGHT_BRANCH, ...
}
```
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