Comparing each row with the same resultset

[Michael Lok]

Hi folks,

I've got one resultset which I need to run a comparison with all the
rows within the same resultset.  For example:

R1
R2
R3
R4
R5

Take R1, I'll need to compare R1 with all rows from R2-R5.  The
comparison will be written in a UDF.  Here's what I have so far:

============================================
RAW = load 'raw_data.txt' using PigStorage(',');

RAW_2 = foreach RAW generate *;

PROCESSED = foreach RAW {
    /* perform comparo here */
};
============================================

I'm stuck at the filtering inside the nested block.  How should I go
about the comparing the rows there?

Any help is greatly appreciated.


Thanks!