XiDuo You created SPARK-38832:
---------------------------------
Summary: Remove unnecessary distinct in aggregate expression by
distinctKeys
Key: SPARK-38832
URL: https://issues.apache.org/jira/browse/SPARK-38832
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.4.0
Reporter: XiDuo You
We can remove the distinct in aggregate expression if the child distinct
semantics is guaranteed.
For example:
{code:java}
SELECT count(distinct c) FROM (
SELECT c FROM t GROUP BY c
){code}
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