Github user sunjincheng121 commented on a diff in the pull request:
https://github.com/apache/flink/pull/4105#discussion_r121325300
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/scala/stream/sql/AggregationsTest.scala
---
@@ -39,4 +44,34 @@ class AggregationsTest extends TableTestBase {
streamUtil.tEnv.sql(sqlQuery)
}
+
+ @Test
+ def testUserDefinedAggregateFunctionWithScalaAccumulator(): Unit = {
+ streamUtil.addFunction("udag", new MyAgg)
+ val call = streamUtil
+ .tEnv
+ .functionCatalog
+ .lookupFunction("udag", Seq())
+ .asInstanceOf[AggFunctionCall]
+
+ val typeInfo = call.accTypeInfo
+ assertTrue(typeInfo.isInstanceOf[CaseClassTypeInfo[_]])
+ assertEquals(2, typeInfo.getTotalFields)
+ val caseTypeInfo = typeInfo.asInstanceOf[CaseClassTypeInfo[_]]
+ assertEquals(Types.LONG, caseTypeInfo.getTypeAt(0))
+ assertEquals(Types.LONG, caseTypeInfo.getTypeAt(1))
+ }
+}
+
+case class Accumulator(sum: Long, count: Long)
--- End diff --
The members of `Accumulator` must be modified.
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