Re: generate_series woes

On Mon, Apr 14, 2008 at 11:21:58AM +0200, Harald Fuchs wrote:
> I think there's something sub-optimal with generate_series.
> In the following, "documents" is a table with more than 120000 rows,
> vacuumed and analyzed before the queries.
> Since generate_series is a builtin function, can't it tell how many
> rows it will return?

i think it would be better off not to limit some functionality for
builtin functions. it would be much nicer to have the ability to hint
planer about rowcount from function *in* the sql.

something like:

select i from generate_series(1,10) {hint:10} as i;

i'm not proposiung syntax. i'm suggesting the functionality.

depesz

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