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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