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https://issues.apache.org/jira/browse/FLINK-7475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16310435#comment-16310435
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ASF GitHub Bot commented on FLINK-7475:
---------------------------------------
Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/4963#discussion_r159549032
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/state/ListState.java ---
@@ -33,4 +35,14 @@
* @param <T> Type of values that this list state keeps.
*/
@PublicEvolving
-public interface ListState<T> extends MergingState<T, Iterable<T>> {}
+public interface ListState<T> extends MergingState<T, Iterable<T>> {
+ /**
+ * Updates the state of the current key for the given source namespaces
into the state of
+ * the target namespace.
+ *
+ * @param values The target namespace where the merged state should be
stored.
+ *
+ * @throws Exception The method may forward exception thrown internally
(by I/O or functions).
+ */
+ void update(List<T> values) throws Exception;
--- End diff --
We should define and document what happens if this is called with `null` or
empty list. Does this lead to different results for `get()` ?
> support update() in ListState
> -----------------------------
>
> Key: FLINK-7475
> URL: https://issues.apache.org/jira/browse/FLINK-7475
> Project: Flink
> Issue Type: Improvement
> Components: Core, DataStream API, State Backends, Checkpointing
> Affects Versions: 1.4.0
> Reporter: yf
> Assignee: Bowen Li
> Fix For: 1.5.0
>
>
> If I want to update the list.
> I have to do two steps:
> listState.clear()
> for (Element e : myList) {
> listState.add(e);
> }
> Why not I update the state by:
> listState.update(myList) ?
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