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From: Tom Lane <tgl@sss.pgh.pa.us>
To: basuraspam - <basuraspam0@gmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Database views metadata always nullable columns
Date: Fri, 02 Jun 2017 10:21:30 -0400
Message-ID: <12456.1496413290@sss.pgh.pa.us> (raw)
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basuraspam - <basuraspam0@gmail.com> writes:
>    Doing some automatic metadata parsing job against postgresql schema I
> just find that database views always shown all its column as nullable, it
> doesn't matter what are the constraints in the original table columns used
> as source to create the view.
> I just checked it against infomation_schema and pg_attribute with the same
> result.

regression=# create table foo (f1 int, f2 int not null);
CREATE TABLE
regression=# select column_name, is_nullable from information_schema.columns where table_name = 'foo';
 column_name | is_nullable 
-------------+-------------
 f1          | YES
 f2          | NO
(2 rows)

regression=# select attname,attnotnull from pg_attribute where attrelid = 'foo'::regclass and attnum > 0;
 attname | attnotnull 
---------+------------
 f1      | f
 f2      | t
(2 rows)

So I don't see anything particularly broken here.  Maybe you should
provide some concrete examples rather than making sweeping claims.

			regards, tom lane


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