Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4355#discussion_r130113134
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/utils/UserDefinedFunctionUtils.scala
---
@@ -307,6 +312,119 @@ object UserDefinedFunctionUtils {
//
----------------------------------------------------------------------------------------------
/**
+ * get data view type information from accumulator constructor.
+ *
+ * @param aggFun aggregate function
+ * @return the data view specification
+ */
+ def getDataViewTypeInfoFromConstructor(
+ aggFun: AggregateFunction[_, _])
+ : mutable.HashMap[String, TypeInformation[_]] = {
+
+ val resultMap = new mutable.HashMap[String, TypeInformation[_]]
+ val acc = aggFun.createAccumulator()
+ val fields: util.List[Field] =
TypeExtractor.getAllDeclaredFields(acc.getClass, true)
+ for (i <- 0 until fields.size()) {
+ val field = fields.get(i)
+ field.setAccessible(true)
+ if (classOf[DataView].isAssignableFrom(field.getType)) {
+ if (field.getType == classOf[MapView[_, _]]) {
+ val mapView = field.get(acc)
+ val keyTypeInfo = getFieldValue(classOf[MapView[_, _]], mapView,
"keyTypeInfo")
--- End diff --
If we add `private[flink]` methods to `MapView` (and ListView) to access
the key and value type infos we don't need to use reflection.
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