TypeCast Exception while running Pig Script - hive

Question

Below is my pig script. Its very straightforward. Loading some data. Filtering the data by a column. Generating the schema with datatypes. Storing the data in a hive table.
When I am executing the data, its throwing
emp = load '/root/emp.nulls' using PigStorage(',');
filt = filter emp by $2 is not null;
f = foreach filt generate $0 as id:int, $1 as bdate:chararray, $2 as fname:chararray, $3 as lname:chararray, $4 as gender:chararray, $5 as hdate:chararray;
store f into 'emp_null' using org.apache.hive.hcatalog.pig.HCatStorer();
When I am executing the data, its throwing the below error
2017-09-15 11:21:04,523 [Thread-12] WARN org.apache.hadoop.mapred.LocalJobRunner - job_local1554819907_0001
java.lang.Exception: java.io.IOException: java.lang.ClassCastException: org.apache.pig.data.DataByteArray cannot be cast to java.lang.Integer
at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:522)
Caused by: java.io.IOException: java.lang.ClassCastException: org.apache.pig.data.DataByteArray cannot be cast to java.lang.Integer
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.StoreFuncDecorator.putNext(StoreFuncDecorator.java:83)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:144)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:97)
at org.apache.hadoop.mapred.MapTask$NewDirectOutputCollector.write(MapTask.java:658)
at org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
at org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.write(WrappedMapper.java:112)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapOnly$Map.collect(PigMapOnly.java:48)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.runPipeline(PigGenericMapBase.java:282)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:275)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:65)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:243)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
Can someone help me?
EDIT:
If I generate the schema during loading itself, it works fine.

Answer 1

When you use the following syntax $0 as id:int you are not casting the field but using a new field to store the value in $0.The correct way to do this is to prefix the datatype in front of the field.This might have been fixed in the newer versions of Pig.Here is the issue being discussed to fix it.
f = foreach filt generate (int)$0 as id,
(chararray)$1 as bdate,
(chararray)$2 as fname,
(chararray)$3 as lname,
(chararray)$4 as gender,
(chararray)$5 as hdate;