davidradl commented on code in PR #23441:
URL: https://github.com/apache/flink/pull/23441#discussion_r1337464779
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flink-core/src/main/java/org/apache/flink/api/common/state/AppendingState.java:
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@@ -60,8 +60,11 @@ public interface AppendingState<IN, OUT> extends State {
*
* <p>If null is passed in, the state value will remain unchanged.
*
+ * <p>Except for list state, where null value is not allowed to be passed
in.
Review Comment:
I think when referring to list state you mean the ListState interface. I do
not think that a parent interface should document special behaviour for a child
interface. This breaks to the solid principle Liskov Substitution Principle and
is not good practice.
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