neilconway opened a new issue, #21507:
URL: https://github.com/apache/datafusion/issues/21507
### Describe the bug
```
$ cat ~/groupby_unique_repro.sql
CREATE TABLE t(a INT, b INT, c INT, UNIQUE(a));
INSERT INTO t VALUES (1, 10, 100), (NULL, 20, 200), (NULL, 30, 300);
SELECT a, SUM(c) AS total FROM t GROUP BY a, b ORDER BY a;
DROP TABLE t;
$ cargo run --bin datafusion-cli -- -f ~/groupby_unique_repro.sql
Finished [`dev` profile [unoptimized +
debuginfo]](https://doc.rust-lang.org/cargo/reference/profiles.html#default-profiles)
target(s) in 0.16s
Running `target/debug/datafusion-cli -f
/Users/neilconway/groupby_unique_repro.sql`
DataFusion CLI v53.0.0
0 row(s) fetched.
Elapsed 0.044 seconds.
+-------+
| count |
+-------+
| 3 |
+-------+
1 row(s) fetched.
Elapsed 0.034 seconds.
+------+-------+
| a | total |
+------+-------+
| 1 | 100 |
| NULL | 500 |
+------+-------+
2 row(s) fetched.
Elapsed 0.027 seconds.
$ duckdb -f ~/groupby_unique_repro.sql
┌───────┬────────┐
│ a │ total │
│ int32 │ int128 │
├───────┼────────┤
│ 1 │ 100 │
│ NULL │ 200 │
│ NULL │ 300 │
└───────┴────────┘
```
### To Reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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