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Re: Command Triggers

From: Andres Freund <andres(at)anarazel(dot)de>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org, Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr>
Subject: Re: Command Triggers
Date: 2012-02-27 23:43:02
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Tuesday, February 28, 2012 12:30:36 AM Tom Lane wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
> > Sorry for letting this slide.
> > 
> > Is it worth adding this bit to OpenIntoRel? Not sure if there is danger
> > in allowing anyone to create shared tables
> > 
> > 	/* In all cases disallow placing user relations in pg_global */
> > 	if (tablespaceId == GLOBALTABLESPACE_OID)
> > 	
> > 		ereport(ERROR,
> > 		
> > 				
> > 				 errmsg("only shared relations can be placed in pg_global
> > 
> > tablespace")));
> Ugh ... if that's currently allowed, we definitely need to fix it.
> But I'm not sure OpenIntoRel is the right place.  I'd have expected
> the test to be at some lower level, like heap_create_with_catalog
> or so.
Its definitely allowed right now:

test-upgrade=# CREATE TABLE foo TABLESPACE pg_global AS SELECT 1;
Time: 354.097 ms

The analogous check for the missing one in OpenIntoRel for plain relations is 
in defineRelation. heap_create_with_catalog only contains the inverse check:

	 * Shared relations must be in pg_global (last-ditch check)
	if (shared_relation && reltablespace != GLOBALTABLESPACE_OID)
		elog(ERROR, "shared relations must be placed in pg_global 

Moving it there sounds like a good idea without any problem I can see right 
now. Want me to prepare a patch or is it just the same for you if you do it 


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Subject: Re: Command Triggers
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