Fujii Masao wrote:
> On Thu, Jul 10, 2014 at 6:16 AM, Alvaro Herrera
> <alvhe...@2ndquadrant.com> wrote:

> > Here's a new version of this patch, which is more generic the original
> > versions, and similar to what you describe.
> I've not read the discussion so far at all, but I found the problem
> when I played with this patch. Sorry if this has already been discussed.
> =# create table test as select num from generate_series(1,10) num;
> =# create index testidx on test using minmax (num);
> =# alter table test alter column num type text;
> ERROR:  could not determine which collation to use for string comparison
> HINT:  Use the COLLATE clause to set the collation explicitly.

Ah, yes, I need to pass down collation OIDs to comparison functions.
That's marked as XXX in various places in the code.  Sorry I forgot to
mention that.

Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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