slinkydeveloper commented on a change in pull request #18352:
URL: https://github.com/apache/flink/pull/18352#discussion_r784660032
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File path: docs/content/docs/dev/table/functions/udfs.md
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@@ -240,7 +240,9 @@ An implementation class must extend from one of the
available base classes (e.g.
The class must be declared `public`, not `abstract`, and should be globally
accessible. Thus, non-static inner or anonymous classes are not allowed.
-For storing a user-defined function in a persistent catalog, the class must
have a default constructor and must be instantiable during runtime.
+For storing a user-defined function in a persistent catalog, the class must
have a default constructor
+and must be instantiable during runtime. Anonymous functions in Table API can
only be persisted if the
+function is not stateful (i.e. no non-transient fields).
Review comment:
and non static.
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