Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3033#discussion_r96409192
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/MapJoinLeftRunner.scala
---
@@ -32,6 +33,17 @@ class MapJoinLeftRunner[IN1, IN2, OUT](
broadcastSet match {
case Some(singleInput) => function.join(multiInput, singleInput, out)
case None =>
--- End diff --
I would add an additional condition here and check if we execute an inner
or an outer join.
For that I would add another constructor parameter with a boolean flag
`isOuterJoin` to indicate that this is an outer join (multiInput is outer side).
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