Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10073#discussion_r46510157
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala
---
@@ -133,6 +132,45 @@ object ExtractEquiJoinKeys extends Logging with
PredicateHelper {
}
/**
+ * A pattern that collects the filter and inner joins.
+ *
+ * Filter
+ * |
+ * inner Join
+ * / \ ----> (Seq(plan0, plan1, plan2),
conditions)
+ * Filter plan2
+ * |
+ * inner join
+ * / \
+ * plan0 plan1
+ *
+ * Note: This pattern currently only works for left-deep trees.
+ */
+object ExtractFiltersAndInnerJoins extends PredicateHelper {
+
+ // flatten all inner joins, which are next to each other
+ def flattenJoin(plan: LogicalPlan): (Seq[LogicalPlan], Seq[Expression])
= plan match {
+ case Join(left, right, Inner, cond) =>
+ val (plans, conditions) = flattenJoin(left)
+ (plans ++ Seq(right), conditions ++ cond.toSeq)
+
+ case Filter(filterCondition, j @ Join(left, right, Inner,
joinCondition)) =>
--- End diff --
maybe just `j @ Join(_, _, Inner, _))`, the `left`, `right` and
`joinCondition` are not used.
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