Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/19452#discussion_r143879728
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingSymmetricHashJoinHelper.scala
---
@@ -66,6 +67,60 @@ object StreamingSymmetricHashJoinHelper extends Logging {
}
}
+ /**
+ * Wrapper around various useful splits of the join condition.
+ * left AND right AND joined is equivalent to full.
+ *
+ * Note that left and right do not necessarily contain *all* conjuncts
which satisfy
+ * their condition. Any conjuncts after the first nondeterministic one
are treated as
+ * nondeterministic for purposes of the split.
+ *
+ * @param left Deterministic conjuncts which reference only the left
side of the join.
+ * @param right Deterministic conjuncts which reference only the right
side of the join.
+ * @param joined Conjuncts which are in neither left nor right.
+ * @param full The full join condition.
+ */
+ case class JoinConditionSplitPredicates(
+ left: Option[Expression],
+ right: Option[Expression],
+ joined: Option[Expression],
+ full: Option[Expression]) {}
+
+ object JoinConditionSplitPredicates extends PredicateHelper {
+ def apply(condition: Option[Expression], left: SparkPlan, right:
SparkPlan):
+ JoinConditionSplitPredicates = {
+ // Split the condition into 3 parts:
+ // * Conjuncts that can be applied to the left before storing.
--- End diff --
conjuncts that can be evaluated by only the left input
(no need to refer to storing as that's internal details)
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