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Date: Tue, 24 Mar 2009 12:37:51 -0700 (PDT)
From: "Christopher Olston (JIRA)" <jira@apache.org>
To: pig-dev@hadoop.apache.org
Subject: [jira] Created: (PIG-730) problem combining schema from a union of
 several LOAD expressions, with a nested bag inside the schema.
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problem combining schema from a union of several LOAD expressions, with a nested bag inside the schema.
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                 Key: PIG-730
                 URL: https://issues.apache.org/jira/browse/PIG-730
             Project: Pig
          Issue Type: Bug
         Environment: pig local mode
            Reporter: Christopher Olston


links = (union (load '/echo/olston/data/Echo-fetcher_first_extractedLinks-1' using BinStorage as (url:chararray,outlinks:{t:(target:chararray,text:chararray)})), (load '/echo/olston/data/Echo-fetcher_first_extractedLinks-2' using BinStorage as (url:chararray,outlinks:{t:(target:chararray,text:chararray)})));
DESCRIBE links;

gives this error:

2009-03-24 12:33:59,657 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1052: Cannot cast bag with schema outlinks: bag({t: (target: chararray,text: chararray)}) to tuple with schema tuple
Details at logfile: /echo/olston/data/pig_1237923219665.log

the pig_...log file contains:

ERROR 1052: Cannot cast bag with schema outlinks: bag({t: (target: chararray,text: chararray)}) to tuple with schema tuple
org.apache.pig.impl.logicalLayer.FrontendException: Unable to describe schema for alias links
        at org.apache.pig.PigServer.dumpSchema(PigServer.java:394)
        at org.apache.pig.tools.grunt.GruntParser.processDescribe(GruntParser.java:153)
        at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:188)
        at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:84)
        at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:72)
        at org.apache.pig.Main.main(Main.java:296)
Caused by: org.apache.pig.impl.plan.PlanValidationException: An unexpected exception caused the validation to stop
        at org.apache.pig.impl.plan.PlanValidator.validateSkipCollectException(PlanValidator.java:104)
        at org.apache.pig.impl.logicalLayer.validators.TypeCheckingValidator.validate(TypeCheckingValidator.java:40)
        at org.apache.pig.impl.logicalLayer.validators.TypeCheckingValidator.validate(TypeCheckingValidator.java:30)
        at org.apache.pig.impl.logicalLayer.validators.LogicalPlanValidationExecutor.validate(LogicalPlanValidationExecutor.java:79)
        at org.apache.pig.PigServer.compileLp(PigServer.java:722)
        at org.apache.pig.PigServer.dumpSchema(PigServer.java:386)
        ... 5 more
Caused by: org.apache.pig.impl.logicalLayer.validators.TypeCheckerException: Problem while casting inputs of Union
        at org.apache.pig.impl.logicalLayer.validators.TypeCheckingVisitor.visit(TypeCheckingVisitor.java:2143)
        at org.apache.pig.impl.logicalLayer.LOUnion.visit(LOUnion.java:113)
        at org.apache.pig.impl.logicalLayer.LOUnion.visit(LOUnion.java:34)
        at org.apache.pig.impl.plan.DependencyOrderWalker.walk(DependencyOrderWalker.java:68)
        at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
        at org.apache.pig.impl.plan.PlanValidator.validateSkipCollectException(PlanValidator.java:101)
        ... 10 more
Caused by: org.apache.pig.impl.logicalLayer.validators.TypeCheckerException: Cannot cast bag with schema outlinks: bag({t: (target: chararray,text: chararray)}) to tuple with schema tuple
        at org.apache.pig.impl.logicalLayer.validators.TypeCheckingVisitor.visit(TypeCheckingVisitor.java:2034)
        at org.apache.pig.impl.logicalLayer.LOCast.visit(LOCast.java:65)
        at org.apache.pig.impl.logicalLayer.LOCast.visit(LOCast.java:29)
        at org.apache.pig.impl.plan.DependencyOrderWalker.walk(DependencyOrderWalker.java:68)
        at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
        at org.apache.pig.impl.logicalLayer.validators.TypeCheckingVisitor.checkInnerPlan(TypeCheckingVisitor.java:2944)
        at org.apache.pig.impl.logicalLayer.validators.TypeCheckingVisitor.visit(TypeCheckingVisitor.java:2849)
        at org.apache.pig.impl.logicalLayer.validators.TypeCheckingVisitor.visit(TypeCheckingVisitor.java:2137)
        ... 15 more


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