dongjoon-hyun commented on issue #27233: [SPARK-29701][SQL] Correct behaviours of group analytical queries when empty input given URL: https://github.com/apache/spark/pull/27233#issuecomment-577487224 @tgravescs . This is correctly a SQL correctness issue. Technically, `PostgreSQL` is the only one implementing it according to the SQL standard. `SQL:1999` defines `()` as the grand total and the query is translated into the following roughly. ```sql ... (other clause) UNION ALL SELECT CAST(NULL AS DTPC1) AS CNPC1, CAST(NULL AS DTPC2) AS CNPC2, ... # `grand total` FROM ... ```
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