Re: BUG #14813: pg_get_serial_sequence does not return seqence name for IDENTITY columns

On Tue, Sep 12, 2017 at 5:54 PM, David G. Johnston <
david(dot)g(dot)johnston(at)gmail(dot)com> wrote:

> On Tue, Sep 12, 2017 at 2:20 PM, <zam6ak(at)gmail(dot)com> wrote:
>
>> The following bug has been logged on the website:
>>
>> Bug reference: 14813
>> Logged by: zam zam
>> Email address: zam6ak(at)gmail(dot)com
>> PostgreSQL version: 10beta4
>> Operating system: windows
>> Description:
>>
>> Function pg_get_serial_sequence returns NULL on columns defined as
>> IDENTITY
>>
>> CREATE TABLE IF NOT EXISTS public.test (
>> id bigint NOT NULL GENERATED ALWAYS AS IDENTITY,
>> code text,
>>
>> CONSTRAINT test_pk PRIMARY KEY (id)
>> )
>>
>> SELECT pg_get_serial_sequence('public.test', 'id'); -- returns NULL
>> instead
>> of 'test_id_seq'!
>>
>
> ​I suspect this is an opportunity for documentation enhancement as opposed
> to a bug.
>
> ​The CREATE TABLE docs say that: "It will have an implicit sequence
> attached to it." I take the word "implicit" to mean that an actual
> external sequence object is not created.
>
> David J.
>

But the sequence 'test_id_seq' is created....
To my understanding (and I may be wrong), identity columns are backed by
sequences in PG 10...