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From: Magnus Hagander <[email protected]>
To: Tom Lane <[email protected]>
Cc: pgsql-hackers <[email protected]>
Subject: Re: Docs off on ILIKE indexing?
Date: Tue, 17 Jan 2006 15:44:30 +0100
Message-ID: <[email protected]> (raw)

> > 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

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