left join on multiple columns

Hi,

I am new to pig. I am using pig version 0.12. I found an unexpected
behaviour from left join on multiple columns as listed below

...

...

dump r_four_dim1;

describe r_four_dim1;

dump result_height;

describe result_height;

join_height = join r_four_dim1 by (date, month, year, hh, x, y, z) LEFT
OUTER, result_height by (date, month, year, hh, x, y, z);

dump join_height;

describe join_height;

Result

(1,1,2009,0,559,447,1,-4.964739)

r_four_dim1: {date: int,month: int,year: int,hh: int,x: int,y: int,z:
int,u: float}

(1,1,2009,0,559,447,1,109.71929)

result_height: {date: int,month: int,year: int,hh: int,x: int,y: int,z:
int,height: float}

(1,1,2009,0,559,447,1,-4.964739,,,,,,,,)

join_height: {r_four_dim1::date: int,r_four_dim1::month:
int,r_four_dim1::year: int,r_four_dim1::hh: int,r_four_dim1::x:
int,r_four_dim1::y: int,r_four_dim1::z: int,r_four_dim1::u:
float,result_height::date: int,result_height::month:
int,result_height::year: int,result_height::hh: int,result_height::x:
int,result_height::y: int,result_height::z: int,result_height::height:
float}

Left Join did not work as expected. In addition when I tried to join
only year (year: int) as below

join_height = join r_four_dim1 by year LEFT OUTER, result_height by year;

dump join_height;

describe join_height;

I got the ClassCastException>>>

ERROR 2999: Unexpected internal error. java.lang.String cannot be cast
to java.lang.Integer

java.lang.ClassCastException: java.lang.String cannot be cast to
java.lang.Integer

at
org.apache.pig.backend.hadoop.HDataType.getWritableComparableTypes(HDataType.java:115)

at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Map.collect(PigGenericMapReduce.java:111)

at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.runPipeline(PigGenericMapBase.java:284)

at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:277)

at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:64)

at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)

at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)

at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)

at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168)

at java.security.AccessController.doPrivileged(Native Method)

at javax.security.auth.Subject.doAs(Subject.java:415)

at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1594)

Any suggestions?

BR,

Patcharee