UNION causes casting issues
---------------------------
Key: PIG-2493
URL: https://issues.apache.org/jira/browse/PIG-2493
Project: Pig
Issue Type: Bug
Affects Versions: 0.9.1, 0.10
Reporter: Anitha Raju
Hi,
For the below script,
{code}
A = load '/user/anithar/ip' as (a);
B = load '/user/anithar/ip1' as (a);
C = union A , B ;
D = foreach C generate (chararray)a;
dump D;
{code}
it gives casting error at runtime
{code}
org.apache.pig.backend.executionengine.ExecException: ERROR 1075: Received a
bytearray from the UDF. Cannot determine how to convert the bytearray to string.
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POCast.getNext(POCast.java:660)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:322)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:332)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:284)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.runPipeline(PigGenericMapBase.java:267)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:262)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:64)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1082)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
{code}
It looks like in POCast.java the value of "funcSpec" is not getting any
value(stays null when there is a UNION involved), causing "caster" to get null
and thus the exception.
The same works in 0.8 without any issue.
Regards,
Anitha
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