Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4585#discussion_r142667939
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateUtil.scala
---
@@ -1410,6 +1410,26 @@ object AggregateUtil {
case _: SqlCountAggFunction =>
aggregates(index) = new CountAggFunction
+ case collect: SqlAggFunction if collect.getKind == SqlKind.COLLECT
=>
+ aggregates(index) = sqlTypeName match {
+ case TINYINT =>
+ new ByteCollectAggFunction
+ case SMALLINT =>
+ new ShortCollectAggFunction
+ case INTEGER =>
+ new IntCollectAggFunction
+ case BIGINT =>
+ new LongCollectAggFunction
+ case VARCHAR | CHAR =>
+ new StringCollectAggFunction
+ case FLOAT =>
+ new FloatCollectAggFunction
+ case DOUBLE =>
+ new DoubleCollectAggFunction
+ case _ =>
+ new ObjectCollectAggFunction
+ }
+
--- End diff --
we need to set `accTypes(index) = aggregates(index).getAccumulatorType` in
order to activate the `MapView` feature.
---
