Unable to determine return type for function ArrayFill #6779
Description
Describe the bug
ArrayFill function can return lists with different dimensions:
postgres=# select array_fill(a, b) from fills;
array_fill
-----------------------------------
{{2,2}}
{5,5,5,5,5,5,5}
{{{{1}}}}
{{4,4,4},{4,4,4},{4,4,4},{4,4,4}}
(4 rows)
The standard return_type function cannot determine the type for 'dynamic' functions. because it prefers to assign one type to the whole column and does not take into account their arguments.
To Reproduce
No response
Expected behavior
No response
Additional context
About array_fill function: https://www.postgresql.org/docs/current/functions-array.html.