Has this come up before? 6.4.2 and current sources both have
select count(*) from pg_proc where pg_proc.proargtypes = 701;
select count(*) from pg_proc where proargtypes = 701;
fails with ERROR: Unable to locate type name 'proargtypes' in catalog
The grammar doesn't seem to have a case that allows for a subscripted
attribute name without a relation name in front of it.
It looks like fixing this might be as easy as making the "ColId"
cases in a_expr, b_expr, possibly other places include an
opt_indirection item like columnElem does. But maybe there's
more to it than meets the eye?
regards, tom lane
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