On Sat, Jun 10, 2023 at 12:08 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
Richard Guo <guofenglinux@gmail.com> writes: > We can identify in which form of identity 3 the plan is built up by > checking the relids of the B/C join's outer rel. If it's in the first > form, the outer rel's relids must contain the A/B join. Otherwise it > should only contain B's relid. So I'm considering that maybe we can > adjust the nulling bitmap for nestloop parameters according to that. > Attached is a patch for that. Does this make sense?
Hmm. I don't really want to do it in identify_current_nestloop_params because that gets applied to all nestloop params, so it seems like that risks masking bugs of other kinds. I'd rather do it in process_subquery_nestloop_params, which we know is only applied to subquery LATERAL references. So more or less as attached.
Yeah, that makes sense. process_subquery_nestloop_params is a better place to do this adjustments. +1 to v2 patch.
