mattcuento commented on code in PR #26975:
URL: https://github.com/apache/flink/pull/26975#discussion_r2665358278
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flink-connectors/flink-connector-base/src/main/java/org/apache/flink/connector/base/source/hybrid/HybridSource.java:
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@@ -155,10 +157,12 @@ public SimpleVersionedSerializer<HybridSourceSplit>
getSplitSerializer() {
*
* <p>Currently only the previous enumerator is exposed. The context
interface allows for
* backward compatible extension, i.e. additional information about the
previous source can be
- * supplied in the future.
+ * supplied in the future. However, since enumerator instances are not by
default serializable
+ * or checkpointed, one must handle null returns here.
Review Comment:
Added a javadoc to the concrete implementation where we could return null
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