> > http://www.postgresql.org/docs/8.1/static/indexes-types.html
> > says:
> > The optimizer can also use a B-tree index for queries involving the
> > pattern matching operators LIKE, ILIKE, ~, and ~*, if the
> pattern is a
> > constant and is anchored to the beginning of the string -
> for example,
> > col LIKE 'foo%' or col ~ '^foo', but not col LIKE '%bar'.
>
> > But really, does it use indexes for ILIKE?
>
> That's pretty poorly phrased. For ILIKE it'll only work if
> there's a prefix of the pattern that's not letters (and hence
> is unaffected by the case-folding issue).
Ahh. That explains it. Perfectly logical.
And yes, that's pretty poorly phrased - at least I didn't understand it
:-)
//Magnus