[kepler-users] Type resolving problem

[Tomasz Żok]

Hi,

I've read the documentation about expressions, because what I need is to  
concatenate two arrays of type: string. When I run it inside Expression  
Evaluator I get:

>> t1 = {"a"}
{"a"}
>> t2 = {"b"}
{"b"}
>> t1.getType()
object(arrayType(string,1))
>> t2.getType()
object(arrayType(string,1))
>> concatenate(t1, t2)
{"a", "b"}
>> concatenate(t1, t2).getType()
object(arrayType(string,2))

This is correct and such behaviour is what I'd like to have. However in  
Kepler, expression actor always returns type "general" after concatenation  
no matter what are its input types. Because of this, I cannot run my  
workflow as I get type resolve exception.

I tried configuring output port of expression actor with no effect. I  
tried also to use cast() function, with no effect either. Last thing, I  
cannot use Concatenate Arrays actor, because the number of arrays is not  
known during workflow design - it is determined during runtime, so I must  
do it in a loop.

Do you have any ideas what may cause the problem?

Regards,
Tomek


-- 
Tomasz Zok
Poznan Supercomputing and Networking Center
ul. Noskowskiego 10, 61-704 Poznan, POLAND
http://www.man.poznan.pl