Bruce,
> The ordering of the lexems was changed:
>
> /*
> * Convert 8.3 tsvector to 8.4
> *
> * 8.3 sorts lexemes by its length and if lengths are the same then it uses
> * alphabetic order; 8.4 sorts lexemes in lexicographical order, e.g.
> *
> * => SELECT 'c bb aaa'::tsvector;
> * tsvector
> * ----------------
> * 'aaa' 'bb' 'c' -- 8.4
> * 'c' 'bb' 'aaa' -- 8.3
> */
What does that get us in terms of performance etc.?
Given that it's going to prevent users of Tsearch from
upgrading-in-place, the format change ought to be giving us some serious
gains. Otherwise we should put it off until we need to make other
datatype changes.
--
Josh Berkus
PostgreSQL Experts Inc.
www.pgexperts.com