Re: [HACKERS] TupleDescs and refcounts and such, again
On Tue, 2006-12-26 at 10:47 -0500, Tom Lane wrote: As you can probably guess, I'm leaning to #3, but wanted to see if anyone had an objection or a better idea. 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? Hierarchical queries seem like they'd need something like that? Or should we have the context of a shared context, so that the subquery can put info somewhere where the main context can read it? I like the idea of freeing contexts as early as possible. We might not do that now, but we might like to in the future. -- Simon Riggs EnterpriseDB http://www.enterprisedb.com ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
Re: [HACKERS] TupleDescs and refcounts and such, again
Simon Riggs [EMAIL PROTECTED] 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. regards, tom lane ---(end of broadcast)--- TIP 6: explain analyze is your friend
Re: [HACKERS] TupleDescs and refcounts and such, again
On Wed, 2006-12-27 at 18:05 -0500, Tom Lane wrote: Simon Riggs [EMAIL PROTECTED] 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 ---(end of broadcast)--- TIP 6: explain analyze is your friend
Re: [HACKERS] TupleDescs and refcounts and such, again
Simon Riggs [EMAIL PROTECTED] writes: OK, I guess my only other question is to do with recursive/hierarchical queries: How will we handle those? All in same context? Offhand I don't think it matters. Recursive queries are recursive in the data, not in the plan tree. regards, tom lane ---(end of broadcast)--- TIP 6: explain analyze is your friend
