[jira] [Created] (SPARK-30008) the dataType of collect_list and collect_set aggregate functions should be ArrayType(_, false)

["Kent Yao (Jira)" <ji...@apache.org>]

Kent Yao created SPARK-30008:
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             Summary: the dataType of collect_list and collect_set aggregate functions should be ArrayType(_, false)
                 Key: SPARK-30008
                 URL: https://issues.apache.org/jira/browse/SPARK-30008
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.4, 2.3.4
            Reporter: Kent Yao



{code:java}
// Do not allow null values. We follow the semantics of Hive's collect_list/collect_set here.
// See: org.apache.hadoop.hive.ql.udf.generic.GenericUDAFMkCollectionEvaluator
{code}

These two functions do not allow null values as they are defined, so their elements should not contain null.

Casting collect_list(a) to ArrayType(_, false) will fail.




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