Waiting for 9.1 – Faster LIKE/ILIKE

On 1st of February, Tom Lane committed patch:

Support LIKE and ILIKE index searches via contrib/pg_trgm indexes.
Unlike Btree-based LIKE optimization, this works for non-left-anchored
search patterns.  The effectiveness of the search depends on how many
trigrams can be extracted from the pattern.  (The worst case, with no      
trigrams, degrades to a full-table scan, so this isn't a panacea.  But   
it can be very useful.)                                                 
Alexander Korotkov, reviewed by Jan Urbanski

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