My first Pig script - filter input by UUID, then sort by score

gistfile1.txt

-- Filter rows in $inputFile by UUIDs present in $filterByFile, then sort by score
input = LOAD '$inputFile' USING PigStorage('\t') AS (uuid:chararray,score:double);
filter_by = LOAD '$filterByFile' USING PigStorage('\t') AS (uuid:chararray);
filtered = JOIN input BY uuid, filter_by by uuid; 
wanted_fields = FOREACH filtered GENERATE $0 as uuid:chararray, $1 as score:double;
ordered = ORDER wanted_fields BY score DESC;
STORE ordered INTO '$outputDir' USING PigStorage('\t');