AVG, MIN, MAX error in Pig while COUNT works - count

Question

I'm trying to use AVG,MIN,MAX in Pig. Both MIN and MAX functions got stuck while executing and AVG function throws an error. But the COUNT function works fine.
org.apache.pig.backend.executionengine.ExecException: ERROR 0: Scalar has more than one row in the output. 1st : (GRADE 2 TEACHER,{(65587.90)}), 2nd :(GRADE 4 TEACHER,{(56567.24)})
My code:
register 'pig/contrib/piggybank/java/piggybank.jar';
define Replace org.apache.pig.piggybank.evaluation.string.REPLACE();
A = LOAD '/user/hduser/salaryTravel.csv' using org.apache.pig.piggybank.storage. CSVLoader() AS (name:chararray,job:chararray,salary:chararray,TA:chararray,type:chararray,org:chararray,year:int);
B = foreach A generate name,job,REPLACE(salary,',','') as salary:float, REPLACE(TA,',','') as TA:float, type, org, year;
C = filter B by type=='LBOE';
D = filter C by year==2010;
E = group D by job;
number = foreach E generate group,COUNT(D.salary);
average = foreach E genetate group,AVG(D.salary);
minim = foreach E genetate group,MIN(D.salary);
maxim = foreach E genetate group,MAX(D.salary);
Sample Data
(ABBOTT,DEEDEE W,GRADES 9-12 TEACHER,52,122.10,0,LBOE,ATLANTA INDEPENDENT SCHOOL SYSTEM,2010)
(ABBOTT,RYAN V,GRADE 4 TEACHER,56,567.24,0,LBOE,ATLANTA INDEPENDENT SCHOOL SYSTEM,2010)
(ABBOUD,CLAUDIA MORA,GRADES K-5 TEACHER,63,957.50,0,LBOE,ATLANTA INDEPENDENT SCHOOL SYSTEM,2010)
(ABDUL-JABBAR,KHADEEJA ,GRADES 9-12 TEACHER,16,791.73,0,LBOE,ATLANTA INDEPENDENT SCHOOL SYSTEM,2010)
(ABDUL-RAZACQ,SALAHUD-DIN ,INSTRUCTIONAL SPECIALIST P-8,45,832.92,0,LBOE,ATLANTA INDEPENDENT SCHOOL SYSTEM,2010)
(ABDULLAH,DIANA ,SPECIAL ED PARAPRO/AIDE,10,934.94,0,LBOE,ATLANTA INDEPENDENT SCHOOL SYSTEM,2010)
(ABDULLAH,NADIYAH W,GRADES 6-8 TEACHER,75,109.92,0,LBOE,ATLANTA INDEPENDENT SCHOOL SYSTEM,2010)
(ABDULLAH,RHONDALYN Y,SPECIAL ED PARAPRO/AIDE,28,649.34,0,LBOE,ATLANTA INDEPENDENT SCHOOL SYSTEM,2010)
(OSBORNE,CHRISTINE L,INSTRUCTIONAL SUPERVISOR,78,875.59,3,265.71,LBOE,COBB COUNTY SCHOOL DISTRICT,2010)
(OSBORNE,DORIS A,OCCUPATIONAL THERAPIST ,65,421.79,1,156.05,LBOE,COBB COUNTY SCHOOL DISTRICT,2010)
Sample data after the GROUP operation in line 7.
(GRADE 2 TEACHER,{(OSBORNE,VIRGINIA E,GRADE 2 TEACHER,65587.90,0,LBOE,COBB COUNTY SCHOOL DISTRICT,2010)})
(GRADE 4 TEACHER,{(ABBOTT,RYAN V,GRADE 4 TEACHER,56567.24,0,LBOE,ATLANTA INDEPENDENT SCHOOL SYSTEM,2010)})
(MAINTENANCE PERSONNEL,{(BROOKS,RICHARD M,MAINTENANCE PERSONNEL,72655.52,0,LBOE,FULTON COUNTY BOARD OF EDUCATION,2010),(SUMNER,ROBERT O,MAINTENANCE PERSONNEL,72655.53,0,LBOE,FULTON COUNTY BOARD OF EDUCATION,2010),(MCCULLOUGH,ALVIN J,MAINTENANCE PERSONNEL,72655.52,0,LBOE,FULTON COUNTY BOARD OF EDUCATION,2010),(DALTON,JAMES E,MAINTENANCE PERSONNEL,72655.52,2124.60,LBOE,FULTON COUNTY BOARD OF EDUCATION,2010),(SMITH,KEVIN W,MAINTENANCE PERSONNEL,72655.52,0,LBOE,FULTON COUNTY BOARD OF EDUCATION,2010),(MANGHAM,LARRY G,MAINTENANCE PERSONNEL,72655.52,0,LBOE,FULTON COUNTY BOARD OF EDUCATION,2010)})
Is it a bug in Pig? Please help me.

Answer 1

Here is the updated Pig Script.
register 'pig/contrib/piggybank/java/piggybank.jar';
define Replace org.apache.pig.piggybank.evaluation.string.REPLACE();
A = LOAD '/user/hduser/salaryTravel.csv' using org.apache.pig.piggybank.storage. CSVLoader() AS (name:chararray,job:chararray,salary:chararray,TA:chararray,type:chararray,org:chararray,year:int);
B = foreach A generate name,job,REPLACE(salary,',','') as salary, REPLACE(TA,',','') as TA, type, org, year;
B1 = foreach B generate name, job, (double)salary, (double)TA, type, org, year;
C = filter B1 by type=='LBOE';
D = filter C by year==2010;
E = group D by job;
number = foreach E generate group,COUNT(D.salary);
average = foreach E generate group,AVG(D.salary);
minim = foreach E generate group,MIN(D.salary);
maxim = foreach E generate group,MAX(D.salary);
The issue was, you need to provide a explicit casting to the salary and TA attributes.