Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10630#discussion_r49043974
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -966,6 +952,27 @@ object ReplaceDistinctWithAggregate extends
Rule[LogicalPlan] {
}
/**
+ * Replaces logical [[Intersect]] operator with a left-semi [[Join]]
operator.
+ * {{{
+ * SELECT a1, a2 FROM Tab1 INTERSECT SELECT b1, b2 FROM Tab2
+ * ==> SELECT a1, a2 FROM Tab1, Tab2 ON a1<=>b1 AND a2<=>b2
+ * }}}
+ */
+object ReplaceIntersectWithLeftSemi extends Rule[LogicalPlan] {
+ private def buildCond (left: LogicalPlan, right: LogicalPlan):
Seq[Expression] = {
+ require(left.output.length == right.output.length)
--- End diff --
just inline this into the rule, since it is used only once?
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