Re: Range type adaptation implemented

On Mon, Sep 24, 2012 at 11:45:42AM +0200, Karsten Hilbert wrote:

> > The funniest surprise I've had during the development
> > was an error creating the object TextRange('#', '$') in the database.
> > It should be possible as
> >
> >     >>> ord('#'), ord('$')
> >     (35, 36)
> >
> > but PG insisted that "range lower bound must be less than or equal to
> > range upper bound". Well, turns out that:
> >
> >     postgres=# select ascii('#') < ascii('$'), '#' < '$';
> >      ?column? | ?column?
> >     ----------+----------
> >      t        | f
> >     (1 row)
>
> This does not seem intuitive but is probably quite logical:
>
> While
>
>     ascii('#') < ascii('$')
>
> eventually compares numerical values (35 and 36) the comparison
>
>     '#' < '$'
>
> operates on characters the sorting order (<) of which
> depends on the lcoale in use.

And can thus invalidate range bounds when collation rules
are changed per-query !?!

Karsten
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