Re: ERROR: wrong varnullingrels (b 3) (expected (b)) for Var 2/1

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.