Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3623#discussion_r112675377
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/TableFunction.scala
---
@@ -131,8 +129,16 @@ abstract class TableFunction[T] extends
UserDefinedFunction {
* method. Flink's type extraction facilities can handle basic types or
* simple POJOs but might be wrong for more complex, custom, or
composite types.
*
+ * The input arguments are the input arguments which are passed to the
eval() method.
+ * Only the literal arguments (constant values) are passed to the
[[getResultType()]] method.
+ * If non-literal arguments appear, it will pass nulls instead.
--- End diff --
Mention the `argTypes` parameter as well
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