Re: Have the planner convert COUNT(1) / COUNT(not_null_col) to COUNT(*)

>
> which might be a more realistic thing if the query without the WHERE
> clause was part of a VIEW. However, we don't currently have any
> infrastructure to detect when a column *is* NULL. There's only the
> opposite with expr_is_nonnullable() or var_is_nonnullable().
>

But we'd still catch NULL constants, yes?


> I've attached a very slightly revised version of the patch. I became
> aware of a function named get_func_support(), which can be used rather
> than fetching the pg_proc tuple from SysCache, which I was doing in
> v1.  No other changes.
>
> David
>

 The change is a big win for clarity. Applies clean. Passes.