Hi Rémi
> Hey sorry if my answer is stupid,
> but there is an extension for array, even if it is limited to int (but
> int could be indexes of row)
> It's named http://www.postgresql.org/docs/9.3/static/intarray.html
> It provides essential function, although lacking some (I
> re-implemented union of array with disjoint result).
> I think this extension uses indexes
>
Thanks for your answer. If there were a similar strarray, it would be
top nice :-)