| From: | Claudio Natoli <claudio(dot)natoli(at)memetrics(dot)com> |
|---|---|
| To: | 'Tom Lane ' <tgl(at)sss(dot)pgh(dot)pa(dot)us>, 'Joe Conway ' <mail(at)joeconway(dot)com> |
| Cc: | 'Kris Jurka ' <books(at)ejurka(dot)com>, 'Alex ' <alex(at)meerkatsoft(dot)com>, 'Lada 'Ray' Lostak ' <ray(at)unreal64(dot)net>, "'pgsql-patches(at)postgresql(dot)org '" <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: pg_generate_sequence and info_schema patch (Was: SE |
| Date: | 2004-02-01 23:04:17 |
| Message-ID: | A02DEC4D1073D611BAE8525405FCCE2B55F2B2@harris.memetrics.local |
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| Thread: | |
| Lists: | pgsql-patches |
Tom Lane wrote:
> If you want to allow the 3-parameter form to specify a negative step
> size, that's fine. But don't use a heuristic to guess the intended
> step direction.
Have to agree. Ever used MatLab? They have a fairly intuitive approach:
1:5 => [1 2 3 4]
1:2:5 => [1 3 5]
5:1 => empty matrix
5:-1:1 => [5 4 3 2 1]
Basically, step size is assumed to be +1, unless provided (in their syntax,
as the second argument when 3 arguments are given). Empty ranges produce an
emty result.
Cheers,
Claudio
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