apache pig - Sending relation to UDF functions -


can send relation pig udf function input? relation can have multiple tuples in it. how read each tuple 1 one in pig udf function?

ok.below sample input file.

surender,hdfc,60000,cts raja,axis,80000,tcs raj,hdfc,70000,tcs kumar,axis,70000,cts remya,axis,40000,cts arun,sbi,30000,tcs vimal,sbi,10000,tcs ankur,hdfc,80000,cts karthic,hdfc,95000,cts sandhya,axis,60000,cts   amit,sbi,70000,cts  myinput = load '/home/cloudera/surender/laurela/balance.txt' using pigstorage(',') as(name:chararray,bank:chararray,amt:long,company:chararray);  grouped = group myinput company;

all need details highest paid employee in each company. how use udf ?

i need this

cts     karthic,hdfc,95000,cts tcs     raja,axis,80000,tcs

can me on this.

this script give results want : 

    = load '/home/cloudera/surender/laurela/balance.txt' using pigstorage(',') as(name:chararray,bank:chararray,amt:long,company:chararray);      b = group (company);     topresults = foreach b {result = top(1, 2, a); generate flatten(result);}     dump topresults;

explanation:

first group on basis of company.so is:

(cts,{(surender,hdfc,60000,cts),(kumar,axis,70000,cts),(remya,axis,40000,cts),(ankur,hdfc,80000,cts),(karthic,hdfc,95000,cts),(sandhya,axis,60000,cts),(amit,sbi,70000,cts)})

(tcs,{(raja,axis,80000,tcs),(raj,hdfc,70000,tcs),(arun,sbi,30000,tcs),(vimal,sbi,10000,tcs)})

then foreach tuple in b , generate tuple result equal top 1 record relation a found in b on basis of value of column number 2 i.e. amt. columns numbered 0.

note first data has spaces after company name. please remove spaces or use following data :

  surender,hdfc,60000,cts   raja,axis,80000,tcs   raj,hdfc,70000,tcs   kumar,axis,70000,cts   remya,axis,40000,cts   arun,sbi,30000,tcs   vimal,sbi,10000,tcs   ankur,hdfc,80000,cts   karthic,hdfc,95000,cts   sandhya,axis,60000,cts   mit,sbi,70000,cts

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