KurtYoung commented on a change in pull request #8499: [FLINK-12575]
[table-planner-blink] Introduce planner rules to remove redundant shuffle and
collation
URL: https://github.com/apache/flink/pull/8499#discussion_r287199074
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/plan/nodes/physical/batch/BatchExecJoinBase.scala
##########
@@ -70,4 +76,150 @@ abstract class BatchExecJoinBase(
"JoinConditionFunction",
body)
}
+
+ /**
+ * Try to satisfy hash distribution on Non-BroadcastJoin (including
SortMergeJoin and
+ * Non-Broadcast HashJoin).
+ *
+ * @param requiredDistribution distribution requirement
+ * @return a Tuple including 3 element.
+ * The first element is a flag which indicates whether the
requirement can be satisfied.
+ * The second element is the distribution requirement of left child
if the requirement
+ * can be push down into join.
+ * The third element is the distribution requirement of right child
if the requirement
+ * can be push down into join.
+ */
+ def satisfyHashDistributionOnNonBroadcastJoin(
+ requiredDistribution: FlinkRelDistribution)
+ : (Boolean, FlinkRelDistribution, FlinkRelDistribution) = {
Review comment:
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