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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