I'm not sure about the '%' operator, but I'm sure that the GIST index will
never be used in the

  SELECT * FROM users WHERE lower(name) LIKE '%john%';

query; it is used for left or right anchored search, such as 'john%' or
'%john'.

Giuseppe.
-- 
Giuseppe Broccolo - 2ndQuadrant Italy
PostgreSQL Training, Services and Support
giuseppe.brocc...@2ndquadrant.it | www.2ndQuadrant.it

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