Re: pg_generate_sequence and info_schema patch (Was: SE

 
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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