twalthr commented on code in PR #29566:
URL: https://github.com/apache/flink/pull/29566#discussion_r4358525282
##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/StateTypeStrategy.java:
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@@ -19,13 +19,25 @@
package org.apache.flink.table.types.inference;
import org.apache.flink.annotation.PublicEvolving;
+import org.apache.flink.table.functions.ProcessTableFunction;
+import org.apache.flink.table.types.DataType;
import javax.annotation.Nullable;
import java.time.Duration;
import java.util.Optional;
-/** Strategy for inferring a function call's intermediate result data type
(i.e. state entry). */
+/**
+ * Strategy for inferring a function call's intermediate result data type
(i.e. state entry).
+ *
+ * <p>For {@link ProcessTableFunction}, returning {@link Optional#empty()}
from {@link
Review Comment:
I would say this is a grey zone. The interface itself has not changed. Also
code implementing it won't. Only the internal utility produces one error less.
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