How many output attributes are allowed the operator to Expression (11.2)

Is it better to have a single (or as little as possible) Expression operators in the maps or not OWB (11.2) limit ourselves to one Expr operator by calling outputAttribute/function?

For example, if I have several function calls, by using the same input fields, create the operator of Expression every time or can I have several attribute (call of the function in the expression builder) for a single operator.

More details: entry: operator Expression Col_1, Col_2, Col_3: to call the function: Get_System (number, number, number, varchar) return varchar
I need to call the above function 3 times, for the first time: Get_System (col_1, col_2, Col_3, 'test'); 2nd time: Get_System (col_1, col_2, Col_3, 'value'); 3rd time: Get_System (col_1, col_2, Col_3, 'free');

Can I create 3 separate functions of Expr or OWB will allow me to create 3 attributes (in the output group) and create an expression for each of the 3 cases I have provided above.


Part 2:
Related question: what happens if I have different columns that are used for another function. For example, adding to the above scenario, if I add 2 extra input columns to the same expression: Col_4, Col_5; Can I use the same Expression (or is it wise to do so) to call the 2nd function. Output attribute 4: Get_Location (number, number) return varchar.

Thank you for your help. 
More details: Input: Col_1, Col_2, Col_3 Expression Operator: To call Function: Get_System(number, number, number, varchar) return varchar
I will need to call the above function 3 times, First Time: Get_System(col_1, col_2, Col_3, 'test'); 2nd time: Get_System(col_1, col_2, Col_3, 'value'); 3rd time: Get_System(col_1, col_2, Col_3, 'free');

Yes, here you can use 3 output in the same Expression attribute:
to call on 3 function as mentioned by you above

Part 2:
Related question: What if I have different columns that are used for another function. For example, adding to the scenario above, if I add 2 additional input columns to the same expression: Col_4, Col_5; Can I use the same Expression (or is it wise to do so) to call the 2nd function. Output attribute 4: Get_Location(number,number) return varchar.

Yes, it's work, you can add as many as input columns to the expression that you would use it or not.

Published by: Katia on May 12, 2010 14:21

Tags: Business Intelligence

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