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Re: TupleDescs and refcounts and such, again

From: "Simon Riggs" <simon(at)2ndquadrant(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: TupleDescs and refcounts and such, again
Date: 2006-12-27 23:12:43
Message-ID: 1167261163.3633.64.camel@silverbirch.site (view raw or flat)
Thread:
Lists: pgsql-hackers
On Wed, 2006-12-27 at 18:05 -0500, Tom Lane wrote:
> "Simon Riggs" <simon(at)2ndquadrant(dot)com> writes:
> > Is it possible to allocate the subquery in a child context of the main
> > query, so that it is technically a different context, yet can be freed
> > simultaneously?
> 
> That's exactly what the code *was* doing, but the problem is that we'd
> free the child context during ExecEndSubqueryScan, at which point the
> tupdesc is still needed.

OK, I guess my only other question is to do with recursive/hierarchical
queries: How will we handle those? All in same context?

I guess many subqueries are transformable into main joins anyway, so the
distinction is probably moot anyhow.

-- 
  Simon Riggs             
  EnterpriseDB   http://www.enterprisedb.com



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