Getting AVG in pig - hadoop

Question

I need to get the average age in each gender group...
Here is my data set:
01::F::21::0001
02::M::31::21345
03::F::22::33323
04::F::18::123
05::M::31::14567
Basically this is
userid::gender::age::occupationid
Since there is multiple delimiter, i read somewhere here in stackoverflow to load it first via TextLoader()
loadUsers = LOAD '/user/cloudera/test/input/users.dat' USING TextLoader() as (line:chararray);
testusers = FOREACH loadusers GENERATE FLATTEN(STRSPLIT(line,'::')) as (user:int, gender:chararray, age:int, occupation:int);
grunt> DESCRIBE testusers;
testusers: {user: int,gender: chararray,age: int,occupation: int}
grouped_testusers = GROUP testusers BY gender;
average_age_of_testusers = FOREACH grouped_testusers GENERATE group, AVG(testusers.age);
after running
dump average_age_of_testusers
this is the error in hdfs
2016-10-31 13:39:22,175 [main] ERROR org.apache.pig.tools.pigstats.SimplePigStats -
ERROR 0: Exception while executing (Name: grouped_testusers: Local Rearrange[tuple]{chararray}(false) - scope-284 Operator Key: scope-284): org.apache.pig.backend.executionengine.ExecException:
ERROR 2106: Error while computing average in Initial 2016-10-31 13:39:22,175 [main]
ERROR org.apache.pig.tools.pigstats.PigStatsUtil - 1 map reduce job(s) failed!
Input(s):
Failed to read data from "/user/cloudera/test/input/users.dat"
Output(s):
Failed to produce result in "hdfs://quickstart.cloudera:8020/tmp/temp-169204712/tmp-1755697117"
This is my first try in programming in pig, so forgive me if the solution is very obvious.
Analyzing it further, it seems it has trouble computing the average, i thought i made a mistake in data type but age is int.
if you can help me, thank you.

Answer 1

I figured out the problem in this one. Please refer to How can correct data types on Apache Pig be enforced? for a better explanation.
But then, just to show what I did... I had to cast my data
FOREACH loadusers GENERATE FLATTEN((tuple(int,chararray,int,int)) STRSPLIT(line,'::')) as (user:int, gender:chararray, age:int, occupation:int);
AVG is failing because loadusers.age is being treated as string instead of int.