Nested FILTER in PIG - hadoop

Question

I want to perform a nested filter statement in Pig. For Example:
Query:
select trim(udc1.drky) drky,
trim(udc1.drsy) drsy,
trim(udc1.drrt) drrt,
trim(udc1.drdl01) drld01,
'Fixed' as AssetType
from f0005 udc1
where trim(udc1.drsy) = '12'
and trim(udc1.drrt) = 'C2'
and trim(udc1.drky) not in (
select trim(drky)
from f0005
where trim(drsy) = '57' and trim(drrt) = 'AC'
)
I need to convert the above query to a Pig script. However, I don't know how to take the filters from the inner query and associate them with the outer query. I can write a Pig UDF as a last option but would rather implement a solution in native Pig.
Please help me with the above issue.

Answer 1

Let's say the below is your input
Input is as per layout of
drky, drsy, drtt, drld01
1,57,AC,999
2,57,AC,899
2,12,C2,799
1,12,C2,699
4,57,BC,990
5,12,C3,998
6,12,C2,997
As Per your query the expected output is
6,12,C2,997
In Pig You can achieve this with the help of JOINS. Pls Look into below Code
records = LOAD '/user/user/inputfiles/assets.txt' USING PigStorage(',') AS(drky:chararray,drsy:chararray,drtt:chararray,drld01:chararray);
records_filter = FILTER records BY drsy == '57' AND drtt == 'AC';
records_each = FOREACH records_filter GENERATE drky as drky_temp;
records_join = JOIN records BY drky LEFT OUTER, records_each BY drky_temp;
records_join_filter = FILTER records_join BY drky_temp is null and drsy == '12' AND drtt == 'C2';
records_output = FOREACH records_join_filter GENERATE drky, drsy, drtt, drld01, 'FIXED' AS asset_type;
dump records_output;
OutPut as Per above Pig Script
6,12,C2,997,FIXED