aljoscha commented on a change in pull request #13775:
URL: https://github.com/apache/flink/pull/13775#discussion_r511985631



##########
File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/KeyedStream.java
##########
@@ -454,11 +479,7 @@ private static boolean isEnumType(TypeInformation<?> type) 
{
                 */
                @PublicEvolving
                public IntervalJoined<T1, T2, KEY> between(Time lowerBound, 
Time upperBound) {
-
-                       TimeCharacteristic timeCharacteristic =
-                               
streamOne.getExecutionEnvironment().getStreamTimeCharacteristic();
-
-                       if (timeCharacteristic != TimeCharacteristic.EventTime) 
{
+                       if (timeBehaviour != TimeBehaviour.EventTime) {

Review comment:
       It's interesting, we allow users to call `inProcessingTime()` but it 
will not work because of this. 😅 Maybe we should just document that an interval 
join is always in event time and don't allow configuring it for now?




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