Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/2653#discussion_r89124491
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/functions/utils/UserDefinedFunctionUtils.scala
---
@@ -162,24 +191,107 @@ object UserDefinedFunctionUtils {
}
/**
+ * Internal method of [[ScalarFunction#getResultType()]] that does some
pre-checking and uses
+ * [[TypeExtractor]] as default return type inference.
+ */
+ def getResultType(
+ tableFunction: TableFunction[_],
+ signature: Array[Class[_]])
+ : TypeInformation[_] = {
+ // find method for signature
+ val evalMethod = tableFunction.getEvalMethods
+ .find(m => signature.sameElements(m.getParameterTypes))
+ .getOrElse(throw new ValidationException("Given signature is
invalid."))
+
+ val userDefinedTypeInfo = tableFunction.getResultType
+ if (userDefinedTypeInfo != null) {
+ userDefinedTypeInfo
+ } else {
+ try {
+ TypeExtractor.getForClass(evalMethod.getReturnType)
+ } catch {
+ case ite: InvalidTypesException =>
+ throw new ValidationException(
+ s"Return type of table function '$this' cannot be " +
--- End diff --
This method is never used. So I will remove this.
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