> So, final propose:
> rename cfglocale to cfglanguages and store in it array of laguage names
> which is produced from first part of locale names:
> russian   '{ru_RU, Russian_Russia}'
> spanish   '{es_ES, es_CL, Spanish_Spain, Spanish_Chile}'
> Comments?

Why not do it the other way around?
es_ES           spanish
Spanish_Spain   spanish
ru_RU           russian
pt_BR           portuguese_brazil

That way you don't need any funny index.  Or do you need the list of
locales for each language? (but even if you do, you can easily obtain it
by indexing both columns separately using btrees anyway)

Alvaro Herrera                               http://www.PlanetPostgreSQL.org/
"I can see support will not be a problem.  10 out of 10."    (Simon Wittber)

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