snuyanzin commented on code in PR #23805:
URL: https://github.com/apache/flink/pull/23805#discussion_r1405381059
##########
docs/content/docs/dev/table/functions/udfs.md:
##########
@@ -227,6 +227,20 @@ env.from("MyTable").select(call(classOf[MyConcatFunction],
$"a", $"b", $"c"));
{{< /tab >}}
{{< /tabs >}}
+{{< hint info >}}
+`TableEnvironment` provides two overload methods to create temporary system
function with an `UserDefinedFunction`:
+
+- *createTemporarySystemFunction(
+ String name, Class<? extends UserDefinedFunction> functionClass)*
+- *createTemporarySystemFunction(String name, UserDefinedFunction
functionInstance)*
+
+It is recommended to use `functionClass` over `functionInstance` as far as you
can,
Review Comment:
May be it would make sense to mention that in case of `functionClass` it
requires the ability to invoke constructor with no args
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