[jira] [Created] (SPARK-34882) RewriteDistinctAggregates can cause a bug if the aggregator does not ignore NULLs

["Tanel Kiis (Jira)" <ji...@apache.org>]

Tanel Kiis created SPARK-34882:
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             Summary: RewriteDistinctAggregates can cause a bug if the aggregator does not ignore NULLs
                 Key: SPARK-34882
                 URL: https://issues.apache.org/jira/browse/SPARK-34882
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.2.0
            Reporter: Tanel Kiis


{code:title=group-by.sql}
SELECT first(DISTINCT a), last(DISTINCT a), first(DISTINCT b), last(DISTINCT b)
FROM testData WHERE a IS NOT NULL AND b IS NOT NULL;
{code}
{code:title=group-by.sql.out}
-- !query
SELECT first(DISTINCT  a), last(DISTINCT  a), first(DISTINCT  b), last(DISTINCT  b)
FROM testData WHERE a IS NOT NULL AND b IS NOT NULL
-- !query schema
struct<first(DISTINCT a):int,last(DISTINCT a):int,first(DISTINCT b):int,last(DISTINCT b):int>
-- !query output
1	3	NULL	NULL
{code}

The results should not be NULL, because NULL inputs are filtered out.



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