[PIG-1813] Pig 0.8 throws ERROR 1075 while trying to refer a map in the result of eval udf.Works with 0.7

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.8.1
• Hadoop Flags: Reviewed
• Assignee: Daniel Dai
• Reporter: Vivek Padmanabhan
• Created: 20/Jan/11 16:25
• Updated: 25/Apr/11 21:27
• Resolved: 27/Jan/11 07:12

Description

register myudf.jar;
A = load 'input' MyZippedStorage('\u0001') as ($inputSchema);
B = foreach A generate id , value ;
C = foreach B generate id , org.myudf.ExplodeHashList( (chararray)value, '\u0002', '\u0004', '\u0003') as value;
D = FILTER C by value is not null;
E = foreach D generate id , flatten(org.myudf.GETFIRST(value)) as hop;
F = foreach E generate id , hop#'rmli' as rmli:bytearray ;
store F into 'output.bz2' using PigStorage();

The above script fails when run with Pig 0.8 but runs fine with Pig 0.7 or if pig.usenewlogicalplan=false.
The below is the exception thrown in 0.8 :

org.apache.pig.backend.executionengine.ExecException: ERROR 1075: Received a bytearray from the UDF. Cannot determine how to convert the bytearray to map.
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POCast.getNext(POCast.java:952)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POMapLookUp.processInput(POMapLookUp.java:87)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POMapLookUp.getNext(POMapLookUp.java:98)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POMapLookUp.getNext(POMapLookUp.java:117)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:346)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:291)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:236)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:231)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:53)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:638)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:314)
at org.apache.hadoop.mapred.Child$4.run(Child.java:217)
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:1062)
at org.apache.hadoop.mapred.Child.main(Child.java:211)