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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: Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Command Triggers
Date: 2011-12-03 21:57:49
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Lists: pgsql-hackers
On Friday, December 02, 2011 03:09:55 AM Tom Lane wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
> > On Thursday, December 01, 2011 07:21:25 PM Tom Lane wrote:
> >> Making this work cleanly would be a bigger deal than I think you're
> >> thinking.
> > 
> > Obviously that depends on the definition of clean...
> > 
> > Changing the grammar to make that explicit seems to involve a bit too
> > many changes on a first glance. The cheap way out seems to be to make
> > the decision in analyze.c:transformQuery.
> > Would that be an acceptable way forward?
> ITYM transformStmt, but yeah, somewhere around there is probably
> reasonable. The way I'm imagining this would work is that IntoClause
> disappears from Query altogether: analyze.c would build a utility
> statement
> CreateTableAs, pull the IntoClause out of the SelectStmt structure and
> put it into the utility statement, and then proceed much as we do for
> ExplainStmt (and for the same reasons).
Ok. Because my book turned out to be boring I started looking at this. I 
wonder if wouldn't be better to do check in directly in raw_parser(). The 
advantage would be that that magically would fix the issue of not logging 
CTAS/select when using log_statement = ddl and we don't need a snapshot or 
such so that shouldn't be a problem.

Any arguments against doing so?


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