Ok, I've taken a quick look at this too. My first impression is that
this is actually not a very big patch. Much much smaller than I was
afraid of. It seems that dropping the row-level security and the other
change you've already done have helped a great deal.
My first question is, why does the patch need the walker implementation
to gather all the accessed tables and columns? Can't you hook into the
usual pg_xxx_aclcheck() functions? In fact, Peter asked that same
other things). Many things have changed since, but I don't think that
question has been adequately answered. Different handling of permissions
on views was mentioned, but I think that could be handled with just a
few extra checks in the rewriter or executor.
The hooks in simple_heap_insert also seem a bit weird. Perhaps an
artifact of the row-level security stuff that's no longer there. ISTM
that setting the defaults should be done in the same places where the
defaults for acl columns are filled, e.g in ProcedureCreate.
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