Weijun-H opened a new issue, #12248:
URL: https://github.com/apache/datafusion/issues/12248
### Is your feature request related to a problem or challenge?
The most frequent value.
### Describe the solution you'd like
```
> SELECT mode(col) FROM VALUES (NULL), (1), (NULL), (2), (NULL), (3), (3) AS
tab(col);
3
> SELECT mode(col) FROM VALUES (array(1, 2)), (array(1, 2)), (array(2, 3))
AS tab(col);
[1, 2]
-- The function returns either 1 or 2, but not 3
> SELECT mode(col) FROM VALUES (1), (1), (2), (2), (3) AS tab(col);
1
> SELECT mode(col) FROM VALUES (NULL), (NULL) AS tab(col);
NULL
```
### Describe alternatives you've considered
_No response_
### Additional context
https://duckdb.org/docs/sql/functions/aggregates#modex
https://docs.databricks.com/en/sql/language-manual/functions/mode.html
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