postgres=# select *,(select typname from pg_type where oid = castsource) as source,(select typname from pg_type where
oid= casttarget) as target from pg_cast where castsource = 25 or casttarget = 25;castsource | casttarget | castfunc |
castcontext| source | target
------------+------------+----------+-------------+---------+---------- 25 | 2205 | 1079 | i
|text | regclass 25 | 1042 | 0 | i | text | bpchar 25 | 1043 |
0| i | text | varchar 1042 | 25 | 401 | i | bpchar | text 1043 |
25| 0 | i | varchar | text 18 | 25 | 946 | i | char | text 19
| 25 | 406 | i | name | text 25 | 18 | 944 | a | text | char
25 | 19 | 407 | i | text | name 650 | 25 | 730 | a | cidr
| text 869 | 25 | 730 | a | inet | text 16 | 25 | 2971 | a
|bool | text 142 | 25 | 2922 | a | xml | text 25 | 142 | 2896 | e
| text | xml
(14 rows)
Why do we need assignment casts from cidr, inet, bool, and xml to text? These
all seem redundant since there's effectively an assignment cast from every
data type to text anyways:
postgres=# delete from pg_cast where casttarget = 25;
DELETE 8
postgres=# insert into t values ('1.0.0.0'::cidr);
INSERT 0 1
postgres=# select * from t; t
------------1.0.0.0/32
(1 row)
postgres=# \d t Table "public.t"Column | Type | Modifiers
--------+------+-----------t | text |
-- Gregory Stark EnterpriseDB http://www.enterprisedb.com Ask me about EnterpriseDB's Slony Replication
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