Обсуждение: BUG #8260: problem with sequence and tablename

The following bug has been logged on the website:

Bug reference:      8260
Logged by:          Daniel Degasperi
Email address:      daniel.degasperi@r3-gis.com
PostgreSQL version: 9.1.7
Operating system:   Centos 6.4
Description:

I've created a table:


CREATE TABLE t23456789012345678901234567890123456789012345678901
(
  t1234_id serial,
  PRIMARY KEY (t1234_id)
)
WITH (
  OIDS=FALSE
);


This generated the sequence:


CREATE SEQUENCE
t2345678901234567890123456789012345678901234567890_t1234_id_seq
  INCREMENT 1
  MINVALUE 1
  MAXVALUE 9223372036854775807
  START 1
  CACHE 1;


The table-part in the sequence name was truncated.


Best regards,
Daniel

Object names are limited to a length of NAMEDATALEN-1, which defaults to
63, and are documented to be truncated.

http://www.postgresql.org/docs/9.2/static/sql-syntax-lexical.html

The behaviour you are observing appears to conform to the documentation,
and seems reasonable, so I wouldn't think this was a bug.

daniel.degasperi@r3-gis.com writes:
> CREATE TABLE t23456789012345678901234567890123456789012345678901
> (
>   t1234_id serial,
>   PRIMARY KEY (t1234_id)
> )
> WITH (
>   OIDS=FALSE
> );

> This generated the sequence:

> CREATE SEQUENCE
> t2345678901234567890123456789012345678901234567890_t1234_id_seq

That's operating as designed.

> The table-part in the sequence name was truncated.

Would you rather it failed entirely?  You're up against the limit on
name length (63 bytes in a standard Postgres build).

            regards, tom lane

Am 27.06.2013 19:10, schrieb Tom Lane:
> daniel.degasperi@r3-gis.com writes:
>> CREATE TABLE t23456789012345678901234567890123456789012345678901
>> (
>>    t1234_id serial,
>>    PRIMARY KEY (t1234_id)
>> )
>> WITH (
>>    OIDS=3DFALSE
>> );
>> This generated the sequence:
>> CREATE SEQUENCE
>> t2345678901234567890123456789012345678901234567890_t1234_id_seq
> That's operating as designed.
>
>> The table-part in the sequence name was truncated.
> Would you rather it failed entirely?  You're up against the limit on
> name length (63 bytes in a standard Postgres build).
I don't know if a fail is the best solution, maybe a NOTICE, that the=20
sequence name is not constructed as might be naively expected, would be=20
appropriate.

thanks and regards,
Daniel

>
>             regards, tom lane


--=20
*Daniel Degasperi*
Project manager

*R3 GIS* Srl - GmbH

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