Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4105#discussion_r122447088
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/utils/UserDefinedFunctionUtils.scala
---
@@ -307,9 +315,29 @@ object UserDefinedFunctionUtils {
aggregateFunction: AggregateFunction[_, _],
extractedType: TypeInformation[_] = null)
: TypeInformation[_] = {
+ getGenericTypeOfAggregateFunction(aggregateFunction, "getResultType",
0, extractedType)
+ }
+
+ /**
+ * Internal method of AggregateFunction#getAccumulatorType() that does
some pre-checking
+ * and uses [[TypeExtractor]] as default return type inference.
+ */
+ def getAccumulatorTypeOfAggregateFunction(
+ aggregateFunction: AggregateFunction[_, _],
+ extractedType: TypeInformation[_] = null)
+ : TypeInformation[_] = {
+ getGenericTypeOfAggregateFunction(aggregateFunction,
"getAccumulatorType", 1, extractedType)
+ }
+
+ private def getGenericTypeOfAggregateFunction(
--- End diff --
I would not call the method `getGenericTypeOfAggFunction` because this
implies that it returns a `GenericType` which we want to avoid.
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