paul8263 commented on a change in pull request #18405:
URL: https://github.com/apache/flink/pull/18405#discussion_r788434023
##########
File path:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/AbstractStreamOperator.java
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@@ -323,7 +323,9 @@ protected boolean isUsingCustomRawKeyedState() {
public void open() throws Exception {}
@Override
- public void finish() throws Exception {}
+ public void finish() throws Exception {
+ setCurrentKey(EndOfDataKey.INSTANCE);
Review comment:
Hi @dawidwys ,
Actually if we set null as the key and run in streaming mode, we will get:
`
Caused by: java.lang.NullPointerException: Assigned key must not be null!
at
org.apache.flink.util.Preconditions.checkNotNull(Preconditions.java:76)
at
org.apache.flink.runtime.state.KeyGroupRangeAssignment.assignToKeyGroup(KeyGroupRangeAssignment.java:64)
at
org.apache.flink.runtime.state.AbstractKeyedStateBackend.setCurrentKey(AbstractKeyedStateBackend.java:191)
at
org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.setCurrentKey(StreamOperatorStateHandler.java:362)
... 22 more
`
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