From: | Vincenzo Romano <vincenzo(dot)romano(at)notorand(dot)it> |
---|---|
To: | Stephen Frost <sfrost(at)snowman(dot)net> |
Cc: | Greg Smith <greg(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: On Scalability |
Date: | 2010-10-07 15:25:31 |
Message-ID: | AANLkTinHMonfzBwV55uHAX1KOnY6Zi5_PBdL1Z1E0KgY@mail.gmail.com |
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Lists: | pgsql-hackers pgsql-performance |
2010/10/7 Stephen Frost <sfrost(at)snowman(dot)net>:
> * Vincenzo Romano (vincenzo(dot)romano(at)notorand(dot)it) wrote:
>> I would expect a parser to ... ehm ... parse the CHECK constraint
>> expression at "CREATE TABLE " time and
>> extract all the needed "high quality metadata", like the list of
>> columns involved and the type of
>> checks (range, value list, etc.).
>
> Check constraints can be added after the table is created. Inheiritance
> can be added/changed independently of check constraints. Hacking all of
> the inheiritance, check constraint creation, and any other possibly
> involved code paths to try to figure out if this particular table, check
> constraint, inheiritance relationship, etc, is part of a partitioning
> setup isn't exactly trivial, or the right approach.
>
> Thanks,
>
> Stephen
I think none will say things are trivial.
So, what'd be the right approach in your vision?
I mean, if you think about partitioning a-la Oracle, then you'll have to
parse those expressions anyway.
--
Vincenzo Romano at NotOrAnd Information Technologies
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