Hi,

I have a simple python udf which takes a variable number of (string)
arguments and returns the first non-empty one.
I can see that the udf is invoked from pig but no arguments are being passed.

Here is the script:
========================================================
#!/usr/bin/python

from org.apache.pig.scripting import *

@outputSchema("s:chararray")
def firstNonempty(*args):
    print args
    for v in args:
     if len(v) != 0:
           return v
    return ''

if __name__ == "__main__":
   Pig.compile("""
   data = load 'input.txt' AS (string1:chararray, string2:chararray);
   data = foreach data generate firstNonempty(string1, string2) as id,
string1, string2;
   dump data;
   """).bind().runSingle()

==========================================================
Thanks!

stan

Hi,
I'm looking into it. Internally varargs advertise themselves as having 0
args so I need to add a special case in the JythonFunction to handle
varargs. I'll create a JIRA for this.
For now you can not use varargs as they will always be called with no
parameters.
Julien

On Mon, Oct 17, 2011 at 9:54 AM, Stan Rosenberg <
[EMAIL PROTECTED]> wrote:

> Hi,
>
> I have a simple python udf which takes a variable number of (string)
> arguments and returns the first non-empty one.
> I can see that the udf is invoked from pig but no arguments are being
> passed.
>
> Here is the script:
> ========================================================>
> #!/usr/bin/python
>
> from org.apache.pig.scripting import *
>
> @outputSchema("s:chararray")
> def firstNonempty(*args):
>    print args
>    for v in args:
>        if len(v) != 0:
>           return v
>    return ''
>
> if __name__ == "__main__":
>   Pig.compile("""
>   data = load 'input.txt' AS (string1:chararray, string2:chararray);
>   data = foreach data generate firstNonempty(string1, string2) as id,
> string1, string2;
>   dump data;
>   """).bind().runSingle()
>
> ==========================================================>
> Thanks!
>
> stan
>

Hi Julien,

Thanks for a quick reply.  I patched my local version of
JythonFunction to pass the input parameters when 'varargs' is true.

stan

On Mon, Oct 17, 2011 at 2:26 PM, Julien Le Dem <[EMAIL PROTECTED]> wrote:
> Hi,
> I'm looking into it. Internally varargs advertise themselves as having 0
> args so I need to add a special case in the JythonFunction to handle
> varargs. I'll create a JIRA for this.
> For now you can not use varargs as they will always be called with no
> parameters.
> Julien
>
> On Mon, Oct 17, 2011 at 9:54 AM, Stan Rosenberg <
> [EMAIL PROTECTED]> wrote:
>
>> Hi,
>>
>> I have a simple python udf which takes a variable number of (string)
>> arguments and returns the first non-empty one.
>> I can see that the udf is invoked from pig but no arguments are being
>> passed.
>>
>> Here is the script:
>> ========================================================>>
>> #!/usr/bin/python
>>
>> from org.apache.pig.scripting import *
>>
>> @outputSchema("s:chararray")
>> def firstNonempty(*args):
>>    print args
>>    for v in args:
>>        if len(v) != 0:
>>           return v
>>    return ''
>>
>> if __name__ == "__main__":
>>   Pig.compile("""
>>   data = load 'input.txt' AS (string1:chararray, string2:chararray);
>>   data = foreach data generate firstNonempty(string1, string2) as id,
>> string1, string2;
>>   dump data;
>>   """).bind().runSingle()
>>
>> ==========================================================>>
>> Thanks!
>>
>> stan
>>
>

https://issues.apache.org/jira/browse/PIG-2322

On Mon, Oct 17, 2011 at 12:38 PM, Stan Rosenberg <
[EMAIL PROTECTED]> wrote:

> Hi Julien,
>
> Thanks for a quick reply.  I patched my local version of
> JythonFunction to pass the input parameters when 'varargs' is true.
>
> stan
>
> On Mon, Oct 17, 2011 at 2:26 PM, Julien Le Dem <[EMAIL PROTECTED]> wrote:
> > Hi,
> > I'm looking into it. Internally varargs advertise themselves as having 0
> > args so I need to add a special case in the JythonFunction to handle
> > varargs. I'll create a JIRA for this.
> > For now you can not use varargs as they will always be called with no
> > parameters.
> > Julien
> >
> > On Mon, Oct 17, 2011 at 9:54 AM, Stan Rosenberg <
> > [EMAIL PROTECTED]> wrote:
> >
> >> Hi,
> >>
> >> I have a simple python udf which takes a variable number of (string)
> >> arguments and returns the first non-empty one.
> >> I can see that the udf is invoked from pig but no arguments are being
> >> passed.
> >>
> >> Here is the script:
> >> ========================================================> >>
> >> #!/usr/bin/python
> >>
> >> from org.apache.pig.scripting import *
> >>
> >> @outputSchema("s:chararray")
> >> def firstNonempty(*args):
> >>    print args
> >>    for v in args:
> >>        if len(v) != 0:
> >>           return v
> >>    return ''
> >>
> >> if __name__ == "__main__":
> >>   Pig.compile("""
> >>   data = load 'input.txt' AS (string1:chararray, string2:chararray);
> >>   data = foreach data generate firstNonempty(string1, string2) as id,
> >> string1, string2;
> >>   dump data;
> >>   """).bind().runSingle()
> >>
> >> ==========================================================> >>
> >> Thanks!
> >>
> >> stan
> >>
> >
>