Re: zeros in oidvector type

> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Tom, why are the non-trailing zeros in the *vector types as initialized
> > in the catalog/*.h files.
> 
> > You mentioned you knew what they meant.
> 
> In pg_proc's proargtypes entries, a zero in a valid argument position
> (ie, one of the first 'pronargs' positions) can mean either "any type
> is acceptable" or "opaque argument type" (not sure if those are quite
> the same thing or not!) or "C string input to a datatype's typinput
> conversion routine" (definitely not the same thing).
> 
> The entries in pg_proc.h call out these zeroes explicitly even when
> they are trailing arguments --- generally, the number of values shown
> in the proargtypes column should equal pronargs.

The reason I ask is that there are some parts of the code that try to
find the number of args by looking for the _first_ non-zero entry in the
list.  I changed those to look for the _last_ non-zero entry, but it
sounds like that is still wrong.


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