Github user dawidwys commented on a diff in the pull request:
https://github.com/apache/flink/pull/4145#discussion_r123184832
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/NFA.java ---
@@ -1131,6 +1152,7 @@ private void serializeStates(Set<State<T>> states,
DataOutputView out) throws IO
nameSerializer.serialize(transition.getTargetState().getName(), out);
actionSerializer.serialize(transition.getAction(), out);
+ // backward compatibility
serializeCondition(transition.getCondition(), out);
--- End diff --
Yes, but I think we could increase the VERSION field, and wrap this line in
`if (readVersion == 1) {...}`
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