BUG #2755: strange select behavior - Mailing list pgsql-bugs

From Basil Evseenko
Subject BUG #2755: strange select behavior
Date
Msg-id 200611121649.kACGnXPx002257@wwwmaster.postgresql.org
Whole thread Raw
Responses Re: BUG #2755: strange select behavior
List pgsql-bugs
The following bug has been logged online:

Bug reference:      2755
Logged by:          Basil Evseenko
Email address:      evseenko@sysoft.ru
PostgreSQL version: 8.1.4
Operating system:   Linux 2.6
Description:        strange select behavior
Details:

# \d tables.cart

   Column    |           Type           |
Modifiers
-------------+--------------------------+-----------------------------------
--------------------------------
 id          | integer                  | not null  default
nextval('tables.cart_id_seq'::regclass)
 user_id     | integer                  | not null
 track_id    | integer                  | not null
 price       | numeric(12,2)            | default 0.0
 size        | integer                  | default 0
 expire_date | timestamp with time zone | default (now() + '1
day'::interval)
 timestamp   | timestamp with time zone | default now()
 ordered     | integer                  | not null default 0
 album_id    | integer

# \d tables.download
 Column   |           Type           |
Modifiers
-----------+--------------------------+-------------------------------------
----------------------------------
 id        | integer                  | not null default
nextval('tables.download_id_seq'::regclass)
 cart_id   | integer                  | not null
 http_info | character varying        |
 size      | integer                  | default 0
 timestamp | timestamp with time zone | default now()

# SELECT count(1) from tables.download where cart_id in (select cart_id from
tables.cart where user_id=1);
 count
-------
  2860
(1 row)

# select cart_id from tables.cart where user_id=1;
ERROR:  column "cart_id" does not exist


Why in the first case select doestn't raise syntax error, but use cart_id
from tables.download?
Is this bug or a feature?

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