On 30.06.26 16:01, Tom Lane wrote:
> Peter Eisentraut <peter@eisentraut.org> writes:
>>> The code in transformGroupClause() currently says:
>>> * Likewise, TLEs containing window functions are not okay to add
>>> * to GROUP BY. At this writing, the SQL standard is silent on
>>> * what to do with them, but by analogy to aggregates we'll just
>>> * skip them.
>
>> At the most recent SQL standard meeting, I had this issue addressed, and
>> the handling of window functions in GROUP BY ALL is now specified to
>> work like PostgreSQL already works. I propose the attached patch that
>> updates the code comment about that, and also makes the documentation
>> more specific that we are only talking about aggregate functions and
>> window functions referring to the same query level, which is another
>> thing the original specification was silent about but which has since
>> been fixed.
>
> Cool, thanks for seeing to that. The proposed patch seems okay,
> except that the docs wording makes it sound like outer-level window
> functions are a thing, which they are not AFAIK. You could instead
> write
>
> - contain either an aggregate function or a window function.
> + contain either an aggregate function referring to the
> + same query level or a window function.
Ok, done that way.
