Horton

Re: Optimizing pg_trgm makesign() (was Re: WIP: Fast GiST index build)

Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>

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From: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>, Alexander Korotkov <aekorotkov@gmail.com>
Date: 2011-06-24T19:01:36Z
Lists: pgsql-hackers 
On 24.06.2011 21:24, Robert Haas wrote:
> Out of curiosity (and because there is no comment or Assert here), how
> can you be so sure of the input alignment?

The input TRGM to makesign() is a varlena, so it must be at least 4-byte 
aligned. If it was not for some reason, the existing VARSIZE invocation 
(within GETARR()) would already fail on platforms that are strict about 
alignment.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com