igalshilman commented on a change in pull request #7759:
[FLINK-11485][FLINK-10897] POJO state schema evolution / migrate PojoSerializer
to use new compatibility APIs
URL: https://github.com/apache/flink/pull/7759#discussion_r258410550
##########
File path: flink-core/src/main/java/org/apache/flink/util/OptionalMap.java
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@@ -36,7 +36,7 @@
* An OptionalMap is an order preserving map (like {@link LinkedHashMap})
where keys have a unique string name, but are
* optionally present, and the values are optional.
*/
-final class OptionalMap<K, V> {
+public final class OptionalMap<K, V> {
Review comment:
Should we mark it as a `@Internal`?
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