Github user viirya commented on the issue: https://github.com/apache/spark/pull/16371 Just for reference. Hive's collect_list and collect_set seems supporting partial aggregation. Of course we don't necessarily follow Hive's. https://github.com/apache/hive/blob/ff67cdda1c538dc65087878eeba3e165cf3230f4/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDAFMkCollectionEvaluator.java
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