CASE w/out ELSE hides typmod (was: How define a view that use a case operator for geometry field)
On Fri, Oct 28, 2011 at 10:33:45PM +0200, aperi2007 wrote:
Seem that postgis try to define it an else condition assigning it a
unknown "geometry" ?
It's PostgreSQL, not PostGIS.
The same happens with any type, can be reproduced with something like this:
=# CREATE VIEW test1 AS SELECT
CASE WHEN random() < 0.5 THEN 1::numeric(10, 0)
END;
=# \d test1
View "test.test1"
Column | Type | Modifiers
--------+---------+-----------
case | numeric |
=# CREATE VIEW test2 AS SELECT
CASE WHEN random() < 0.5 THEN 1::numeric(10, 0)
ELSE 0::numeric(10, 0)
END;
=# \d test2
View "test.test2"
Column | Type | Modifiers
--------+---------------+-----------
case | numeric(10,0) |
Maybe someone on pgsql-hackers can tell us more about this.
--strk;
() Free GIS & Flash consultant/developer
/\ http://strk.keybit.net/services.html
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Sandro Santilli <strk@keybit.net> writes:
The same happens with any type, can be reproduced with something like this:
=# CREATE VIEW test1 AS SELECT
CASE WHEN random() < 0.5 THEN 1::numeric(10, 0)
END;
=# \d test1
View "test.test1"
Column | Type | Modifiers
--------+---------+-----------
case | numeric |
=# CREATE VIEW test2 AS SELECT
CASE WHEN random() < 0.5 THEN 1::numeric(10, 0)
ELSE 0::numeric(10, 0)
END;
=# \d test2
View "test.test2"
Column | Type | Modifiers
--------+---------------+-----------
case | numeric(10,0) |
Maybe someone on pgsql-hackers can tell us more about this.
IIRC, the result of a CASE is only considered to have a defined typmod
if all arms of the CASE ... including ELSE ... have the identical
typmod.
regards, tom lane