Vlad Arkhipov wrote:
> CREATE TABLE GIS2.SERVICES (
> ID INTEGER NOT NULL DEFAULT SERIAL(1) PRIMARY KEY,
> CODE VARCHAR(10) NOT NULL UNIQUE
> )
>
> CREATE TABLE GIS2.SERVICE_DATA (
> ID INTEGER NOT NULL DEFAULT SERIAL(1) PRIMARY KEY
> )
>
> CREATE FUNCTION GIS2.GETSERVICEID (
> RESID CHAR(10))
> RETURNS INTEGER
> AS
> VAR ID INTEGER;
>
> TRY
> SELECT ID INTO :ID FROM GIS2.SERVICES WHERE CODE = :RESID;
> CATCH
> IF $rc <> 100 THEN STOP($rc, 'unexpected error')
> ELSE RETURN NULL;
>
> RETURN ID;
>
> EXPLAIN
> SELECT ID
> FROM GIS2.SERVICE_DATA
> WHERE ID = 1
>
> OWNER TABLENAME COLUMN_OR_INDEX
> STRATEGY PAGECOUNT
> -------- ------------- ------------------
> -------------------------------------- ------------
> GIS2 SERVICE_DATA EQUAL CONDITION FOR
> KEY 542
> ID (USED KEY
> COLUMN)
> JDBC_CURSOR_4 RESULT IS
> NOT COPIED ,
> COSTVALUE IS 1
>
> EXPLAIN
> SELECT ID
> FROM GIS2.SERVICE_DATA
> WHERE ID = GIS2.GETSERVICEID('12345')
>
> OWNER TABLENAME COLUMN_OR_INDEX
> STRATEGY PAGECOUNT
> -------- ------------- ------------------
> -------------------------------------- ------------
> GIS2 SERVICE_DATA TABLE
> SCAN 35
> JDBC_CURSOR_2 RESULT IS
> NOT COPIED ,
> COSTVALUE IS 35
>
> Tested on MaxDB 7.6.00.16 - 016-123-109-428.
Hi,
the optimizer doesn't support such conditions with user defined functions by
now.
We have to discuss if we will support it in the future.
If your example comes from a real application and is not only a simplified
example
you could use a sub select instead.
Example:
EXPLAIN
SELECT ID
FROM GIS2.SERVICE_DATA
WHERE ID = (SELECT ID FROM GIS2.SERVICES WHERE CODE = '12345')
Kind regards
Holger
Holger Becker
MaxDB&liveCache
SAP AG
www.sap.com
Sitz der Gesellschaft/Registered Office: Walldorf, Germany
Vorstand/SAP Executive Board: Henning Kagermann (Sprecher/CEO), Léo Apotheker,
Werner Brandt, Claus Heinrich, Gerhard Oswald, Peter Zencke
Vorsitzender des Aufsichtsrats/Chairperson of the SAP Supervisory Board: Hasso
Plattner
Registergericht/Commercial Register Mannheim No HRB 350269
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