question on pig join

[Kochis, Allan]

Hi,
 
 
Have a pig question. 
I have two HDFS file, a smaller file 
that has
|field1|field2|field3|
 
 
and a larger file that has
 
|..|.. |...|field2|....|field3|.....|field1|...| ..|
 
I would like to replace field2 and field3 in my larger file when they
are null match on field1.
 
I am currently doing this by caching my smaller file and using a perl
hash lookup to populate the larger records in a UDF.
 
Can this be done in a pig join?
 
 
Thanks,
 
Allan