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https://issues.apache.org/jira/browse/PIG-1732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933970#action_12933970
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Thejas M Nair commented on PIG-1732:
------------------------------------
+1
Please commit after test-patch and unit tests pass.
> New logical plan: logical plan get confused if we generate the same field
> twice in ForEach
> ------------------------------------------------------------------------------------------
>
> Key: PIG-1732
> URL: https://issues.apache.org/jira/browse/PIG-1732
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.8.0
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Fix For: 0.8.0
>
> Attachments: PIG-1732-1.patch, PIG-1732-2.patch
>
>
> The following script fail:
> {code}
> a = load '1.txt' as (a0, a1);
> b = load '2.txt' as (b0, b1, b2);
> c = foreach a generate a0, a1, a1 as a2;
> d = union b, c;
> e = foreach d generate $1;
> explain e;
> {code}
> Error message:
> ERROR 2000: Error processing rule ColumnMapKeyPrune. Try -t ColumnMapKeyPrune
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1067: Unable to
> explain alias e
> at org.apache.pig.PigServer.explain(PigServer.java:958)
> at
> org.apache.pig.tools.grunt.GruntParser.explainCurrentBatch(GruntParser.java:353)
> at
> org.apache.pig.tools.grunt.GruntParser.processExplain(GruntParser.java:285)
> at
> org.apache.pig.tools.grunt.GruntParser.processExplain(GruntParser.java:248)
> at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.Explain(PigScriptParser.java:605)
> at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:327)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:165)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:141)
> at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:90)
> at org.apache.pig.Main.run(Main.java:498)
> at org.apache.pig.Main.main(Main.java:107)
> Caused by: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2042:
> Error in new logical plan. Try -Dpig.usenewlogicalplan=false.
> at
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:309)
> at org.apache.pig.PigServer.compilePp(PigServer.java:1354)
> at org.apache.pig.PigServer.explain(PigServer.java:927)
> ... 10 more
> Caused by: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 2000:
> Error processing rule ColumnMapKeyPrune. Try -t ColumnMapKeyPrune
> at
> org.apache.pig.newplan.optimizer.PlanOptimizer.optimize(PlanOptimizer.java:120)
> at
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:277)
> ... 12 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.pig.newplan.logical.relational.LOUnion.getSchema(LOUnion.java:75)
> at
> org.apache.pig.newplan.logical.optimizer.SchemaResetter.visit(SchemaResetter.java:127)
> at
> org.apache.pig.newplan.logical.relational.LOUnion.accept(LOUnion.java:102)
> 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:112)
> The problem is caused by c = foreach a generate a0, a1, a1 as a2, in which we
> will generate two fields share one uid.
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