Inaccurate comment, for family-1 polymorphic iso-8859-1 type arguments

Hi Hackers,

I observed that we have inaccurate comment in enforce_generic_type_consistency.

 if (!OidIsValid(elem_typeid))
                {
                        if (allow_poly)
                        {
                                elem_typeid = ANYELEMENTOID;
                                array_typeid = ANYARRAYOID;
                                range_typeid = ANYRANGEOID;
                        }
                        else
                        {
                                /*
                                 * Only way to get here is if all the polymorphic args have
                                 * UNKNOWN inputs
                                 */
                                ereport(ERROR,

                              ...............

                         }

........

}

We reach the error condition even if there is any "anycompatible" parameter is present (and that is of some known type say int32).

I think developer intend to report error if "we have all the family-1 polymorphic arguments as UNKNOWN".

Thoughts?

Please find attached the patch to fix this typo.

Thanks,

Himanshu

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