From: | Josh Berkus <josh(at)agliodbs(dot)com> |
---|---|
To: | Seth Grimes <grimes(at)altaplana(dot)com> |
Cc: | pgsql-advocacy(at)postgresql(dot)org |
Subject: | Re: PostgreSQL derivatives |
Date: | 2008-06-08 21:21:50 |
Message-ID: | 484C4D6E.9070000@agliodbs.com |
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Thread: | |
Lists: | pgsql-advocacy |
Seth,
> My understanding is that the MPP vendors using PostgreSQL and Ingres are
> not *significantly* altering the software other than to, essentially,
> turn off reliance on indexes. They're then adding extensions that are
> proprietary and not, except in the case of GridSQL, open source. Is my
> understanding correct?
Actually, that's incorrect. Greenplum, Yahoo and Netezza all made
substantial alterations to the PostgreSQL code. Greenplum has
re-written the executor and bulk loader, and seems to be on the way to
re-writing the planner entirely. Yahoo and Netezza each pretty much
ripped out everthing except for the parser and a few other bits (Yahoo
kept the Function code, for example), but replaced a majority of the
PostgreSQL code.
I wouldn't classify GridSQL as MPP. It's strictly PP.
--Josh Berkus
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