Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3715#discussion_r125427060
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamWindowJoin.scala
---
@@ -87,44 +98,38 @@ class DataStreamRowStreamJoin(
val config = tableEnv.getConfig
+ val leftIsAccRetract = DataStreamRetractionRules.isAccRetract(left)
+ val rightIsAccRetract = DataStreamRetractionRules.isAccRetract(right)
+ if (leftIsAccRetract || rightIsAccRetract) {
+ throw new TableException(
+ "Retraction on stream window join is not supported yet.")
--- End diff --
```
Windowed stream join does not support updates.
```
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