1) multicolumn GIN
Unlike other indexes, the performance of search
doesn't depends on what column of index (first, last, any subset) is
used in search clause. This property can be used in gincostestimate, but
I haven't looked on it yet.
After some playing I didn't find any mentions in *costestimate function about
difference of cost estimation between first and any other columns in clauses,
so, IMHO, issue above isn't an issue. :)
So, I didn't see any comments/objections and I intend to commit this patch for
next two days and synchronize 'fast insert into GIN' patch with CVS.
Teodor Sigaev E-mail: [EMAIL PROTECTED]
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