okumin commented on code in PR #5323:
URL: https://github.com/apache/hive/pull/5323#discussion_r1684126279
##########
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDAFMkCollectionEvaluator.java:
##########
@@ -62,22 +62,16 @@ public ObjectInspector init(Mode m, ObjectInspector[]
parameters)
super.init(m, parameters);
// init output object inspectors
// The output of a partial aggregation is a list
- if (m == Mode.PARTIAL1) {
+ if (mode == Mode.PARTIAL1 || mode == Mode.COMPLETE) {
inputOI = parameters[0];
return ObjectInspectorFactory.getStandardListObjectInspector(
ObjectInspectorUtils.getStandardObjectInspector(inputOI));
} else {
- if (!(parameters[0] instanceof ListObjectInspector)) {
- //no map aggregation.
- inputOI =
ObjectInspectorUtils.getStandardObjectInspector(parameters[0]);
- return ObjectInspectorFactory.getStandardListObjectInspector(inputOI);
- } else {
- internalMergeOI = (ListObjectInspector) parameters[0];
- inputOI = internalMergeOI.getListElementObjectInspector();
- loi = (StandardListObjectInspector)
- ObjectInspectorUtils.getStandardObjectInspector(internalMergeOI);
- return loi;
- }
+ internalMergeOI = (ListObjectInspector) parameters[0];
Review Comment:
I also guess so. `COLLECT_LIST|SET` processes objects of a type T like that.
- `Mode.PARTIAL1` or `Mode.COMPLETE`: T => List[T]
- `Mode.PARTIAL2` or `Mode.FINAL`: List[T] => List[T]
The original one tried to check the type of inputs, T or List[T], to
conclude the current mode. But it can lead to a wrong conclusion when T is
List[X] because both `List[X]` and `List[List[X]]` hit the condition.
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