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Re: type info refactoring

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: type info refactoring
Date: 2010-10-31 18:43:07
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Lists: pgsql-hackers
2010/10/31 Robert Haas <robertmhaas(at)gmail(dot)com>:
> On Sun, Oct 31, 2010 at 1:01 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
>>> ... I assumed that TypeInfo would be
>>> embedded in other structs directly, rather than a pointer and palloc.
>> Yeah, that would avoid the extra-pallocs complaint, although it might be
>> notationally a bit of a PITA in places like equalfuncs.c.  I think that
>> would end up needing a separate COMPARE_TYPEINFO_FIELD macro instead of
>> being able to treat it like a Node* field.
>> But I'm still wondering whether it's smart to try to promote all of this
>> fundamentally-auxiliary information to first-class status.  It's really
>> unclear to me that that will end up being a net win either conceptually
>> or notationally.
> I think this is a chicken-and-egg problem.  Most of the things we use
> typmod for are unimportant, because typmod doesn't get propagated
> everywhere and therefore if you try to use it for anything that
> actually matters, it'll break.  And on the flip side, there's no need
> for typmod to get propagated everywhere, because it's not used for
> anything all that important.  Blah!

yes, there is a few good possible features that's needs a better using of typmod

a) typmod for OUT varibles
b) enhanced polymorphic types - ANYELEMENT(x)


Pavel Stehule

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