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From "Ankur (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1113) Diamond query optimization throws error in JOIN
Date Thu, 26 Nov 2009 12:32:39 GMT
Diamond query optimization throws error in JOIN
-----------------------------------------------

                 Key: PIG-1113
                 URL: https://issues.apache.org/jira/browse/PIG-1113
             Project: Pig
          Issue Type: Bug
            Reporter: Ankur


The following script results in 1 M/R job as a result of diamond query optimization but the
script fails.

set1 = LOAD 'set1' USING PigStorage as (a:chararray, b:chararray, c:chararray);
set2 = LOAD 'set2' USING PigStorage as (a: chararray, b:chararray, c:bag{});

set2_1 = FOREACH set2 GENERATE a as f1, b as f2, (chararray) 0 as f3;
set2_2 = FOREACH set2 GENERATE a as f1, FLATTEN((IsEmpty(c) ? null : c)) as f2, (chararray)
1 as f3;

all_set2 = UNION set2_1, set2_2;

joined_sets = JOIN set1 BY (a,b), all_set2 BY (f2,f3);
dump joined_sets;

And here is the error

org.apache.pig.backend.executionengine.ExecException: ERROR 1071: Cannot convert a bag to
a String
	at org.apache.pig.data.DataType.toString(DataType.java:739)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POCast.getNext(POCast.java:625)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:364)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:288)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:260)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange.getNext(POLocalRearrange.java:256)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POUnion.getNext(POUnion.java:162)
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:247)
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:238)
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.map(PigMapReduce.java:93)
	at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
	at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
	at org.apache.hadoop.mapred.Child.main(Child.java:159)



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