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org.apache.pig.impl.plan.PlanValidationException: ERROR
2270: Logical plan invalid state: duplicate uid in schema :
first#298:chararray,second#298:chararray	at org.apache.pig.newplan.logical.optimizer.SchemaResetter.validate(SchemaResetter.java:225)	at org.apache.pig.newplan.logical.optimizer.SchemaResetter.visit(SchemaResetter.java:160)	at org.apache.pig.newplan.logical.relational.LOUnion.accept(LOUnion.java:182)	at org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)	at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:50)	at org.apache.pig.newplan.logical.optimizer.SchemaPatcher.transformed(SchemaPatcher.java:43)	at org.apache.pig.newplan.optimizer.PlanOptimizer.optimize(PlanOptimizer.java:113)	at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:287)	at org.apache.pig.PigServer.compilePp(PigServer.java:1317)	at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1254)	at org.apache.pig.PigServer.execute(PigServer.java:1246)	at org.apache.pig.PigServer.executeBatch(PigServer.java:362)	at org.apache.pig.tools.grunt.GruntParser.executeBatch(GruntParser.java:131)	at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:192)	at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:164)	at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:84)	at org.apache.pig.Main.run(Main.java:589)	at org.apache.pig.Main.main(Main.java:148)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.hadoop.util.RunJar.main(RunJar.java:186)