Re: RFC: Query Planner making a distinction between Cross Database and Cross Schema ?

From: Stef <stef(at)chronozon(dot)artofdns(dot)com>
To: "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: RFC: Query Planner making a distinction between Cross Database and Cross Schema ?
Date: 2004-02-12 20:56:30
Message-ID: 20040212205630.GD2137@survivor.hades
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> Ummmm. Postgresql doesn't natively support cross database queries...
>

I know, but it does schema's, and currently, the same
notation is used to specify schema's as 'cross database'.

So the planner often reports 'cross-database not allowed'
in areas where it should at least report 'cross-schema
support is unavailable for this'

case in point, the example trigger. i would have expected
deliberate schemaname.table during an insert to work, but
instead the parser complains about cross-database.

this is why i am saying that if the parser could identify
schema vs database naming, it would help in clarification
of areas where the parser/planner seems to get 'confused'
about what the object is (schema vs database)

currently: history.table1 <-- schema
history2.table1 <-- database

whereas what i am saying is:
history.table1 <-- schema
history2(at)table1 <-- database

readability and consistancy is what i am driving at
here, although it would then be possible for the triggers
to be able to insert/update into schema's that are
specifically named instead of coming back with a
'cross-database not allowed' (when i am trying
to do cross-schema :)

regards
Stef

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