From: | Gregory Stark <stark(at)enterprisedb(dot)com> |
---|---|
To: | "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> |
Cc: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Grzegorz Jaskiewicz" <gj(at)pointblue(dot)com(dot)pl>, "PostgreSQL Hackers" <pgsql-hackers(at)postgresql(dot)org>, "Peter Eisentraut" <peter_e(at)gmx(dot)net> |
Subject: | Re: WIP: default values for function parameters |
Date: | 2008-12-09 15:56:10 |
Message-ID: | 87fxkxibqd.fsf@oxford.xeocode.com |
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Lists: | pgsql-hackers |
"Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> writes:
> 2008/12/9 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
>> "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> writes:
>>> 2008/12/9 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
>>>> ... and it breaks an operator that's already in use.
>>
>>> what is acceptable workaround? I unhappy, so this symbol was used for
>>> this minor contrib module (for this operator doesn't exists regress
>>> test).
>>
>> If you could prove that it were *only* being used by this contrib module
>> then I might hold still for replacing it. But you can't. The odds are
>> good that people have custom data types using similarly-named operators.
>
> it means, so we must not implement any new operator?
Operators mean something specific in Postgres. You're talking about
implementing a new fundamental syntax but using a token that's
indistinguishable from the set of operators.
This is a case where Postgres and these other databases have just diverged and
copying their syntax would break with Postgres's in a major way. It just
doesn't fit. Consider for example things like
foo => bar
foo =>= bar
foo @> bar
How would a user recognise which of these are legal operator names?
Incidentally -- EDB selling Oracle compatibility may put me in a questionable
position here -- the more Oracle incompatibilities in stock Postgres the
better for us. But afaik we don't emulate => anyways so that hardly matters.
If anything it shows how unimportant it is to worry about being compatible on
this front.
--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
Get trained by Bruce Momjian - ask me about EnterpriseDB's PostgreSQL training!
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