Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3673#discussion_r113658551
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/MapJoinLeftRunner.scala
---
@@ -31,7 +32,19 @@ class MapJoinLeftRunner[IN1, IN2, OUT](
override def flatMap(multiInput: IN1, out: Collector[OUT]): Unit = {
broadcastSet match {
case Some(singleInput) => function.join(multiInput, singleInput, out)
- case None =>
+ case None => {
--- End diff --
If we add a parameter `outerJoin: Boolean, we can do
```
case None if outerJoin => function.join(multiInput, null, out)
```
if we generate the function such that it checks if the single input is
`null`
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