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