[
https://issues.apache.org/jira/browse/FLINK-36029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
LEE SOMANG updated FLINK-36029:
-------------------------------
Description:
The current ValueState#value method has the following description
```java
/**
* Returns the current value for the state. When the state is not partitioned
the returned value
* is the same for all inputs in a given operator instance. If state
partitioning is applied,
* the value returned depends on the current operator input, as the operator
maintains an
* independent state for each partition.
*
* <p>If you didn't specify a default value when creating the
ValueStateDescriptor this will
* return \{@code null} when no value was previously set using \{@link
#update(Object)}.
*
* @return The state value corresponding to the current input.
* @throws IOException Thrown if the system cannot access the state.
*/
@Nullable
T value() throws IOException;
```
The method description says that null can be returned, but the method does not
have the @Nullable annotation.
So it seems reasonable to add the @Nullable annotation to make it easier for
the IDE to find the NPE.
> Add @Nullable Annotation to ValueState's Value Method Return Type
> -----------------------------------------------------------------
>
> Key: FLINK-36029
> URL: https://issues.apache.org/jira/browse/FLINK-36029
> Project: Flink
> Issue Type: Improvement
> Reporter: LEE SOMANG
> Priority: Minor
>
> The current ValueState#value method has the following description
>
> ```java
> /**
> * Returns the current value for the state. When the state is not partitioned
> the returned value
> * is the same for all inputs in a given operator instance. If state
> partitioning is applied,
> * the value returned depends on the current operator input, as the operator
> maintains an
> * independent state for each partition.
> *
> * <p>If you didn't specify a default value when creating the
> ValueStateDescriptor this will
> * return \{@code null} when no value was previously set using \{@link
> #update(Object)}.
> *
> * @return The state value corresponding to the current input.
> * @throws IOException Thrown if the system cannot access the state.
> */
> @Nullable
> T value() throws IOException;
> ```
>
> The method description says that null can be returned, but the method does
> not have the @Nullable annotation.
> So it seems reasonable to add the @Nullable annotation to make it easier for
> the IDE to find the NPE.
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