Github user concretevitamin commented on a diff in the pull request:
https://github.com/apache/spark/pull/1190#discussion_r14114049
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala
---
@@ -160,6 +160,43 @@ object HashFilteredJoin extends Logging with
PredicateHelper {
}
/**
+ * A pattern that finds joins with equality conditions that can be
evaluated using equi-join.
+ */
+object ExtractEquiJoinKeys extends Logging with PredicateHelper {
+ /** (joinType, rightKeys, leftKeys, condition, leftChild, rightChild) */
+ type ReturnType =
+ (JoinType, Seq[Expression], Seq[Expression], Option[Expression],
LogicalPlan, LogicalPlan)
+
+ def unapply(plan: LogicalPlan): Option[ReturnType] = plan match {
+ case join @ Join(left, right, joinType, condition) =>
+ logger.debug(s"Considering join on: $condition")
+ // Find equi-join predicates that can be evaluated before the join,
and thus can be used
+ // as join keys.
+ val (joinPredicates, otherPredicates) =
condition.map(splitConjunctivePredicates).
--- End diff --
nit: dot should precede its operator immediately
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