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
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