Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/4536#discussion_r135430307
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/schema/FlinkTableFunctionImpl.scala
---
@@ -71,6 +69,9 @@ class FlinkTableFunctionImpl[T](
override def getElementType(arguments: util.List[AnyRef]): Type =
classOf[Array[Object]]
+ // we do never use the FunctionParameters, so return an empty list
+ override def getParameters: util.List[FunctionParameter] =
Collections.emptyList()
--- End diff --
`ReflectiveFunctionBase#getParameters` is used to create
`SqlOperandTypeChecker` in the previous implementation. But with the new
implementation, we don't need the `ReflectiveFunctionBase#getParameters` to
create `SqlOperandTypeChecker`. So I think we can just return an empty list.
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