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Re: revised hstore patch

From: Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>
To: pgsql(at)j-davis(dot)com (Jeff Davis), pgsql-hackers(at)postgresql(dot)org
Subject: Re: revised hstore patch
Date: 2009-07-22 00:51:10
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Lists: pgsql-hackers
>>>>> "Jeff" == Jeff Davis <pgsql(at)j-davis(dot)com> writes:

 >> I'm prepared to give slightly more consideration to option #3:
 >> make the new code read the old format as well as the new one. I
 >> believe (though I have not yet tested) that it is possible to
 >> reliably distinguish the two with relatively low overhead, though
 >> the overhead would be nonzero, and do an in-core format conversion
 >> (which would result in writing out the new format if anything
 >> changed).

 Jeff> It might be good to have a way to ensure that all values have
 Jeff> been upgraded to the new format. Otherwise you have to
 Jeff> permanently maintain the old format even across multiple
 Jeff> upgrades. Maybe that's not a big deal, but I thought I'd bring
 Jeff> it up.

Running  ALTER TABLE foo ALTER COLUMN bar TYPE hstore USING bar || '';
on all of your hstore columns would suffice to ensure that, I believe.
(Subject to testing once I actually have code for it, of course.)

Andrew (irc:RhodiumToad)

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