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https://issues.apache.org/jira/browse/PIG-4376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Daniel Dai updated PIG-4376:
----------------------------
Assignee: Kevin Springborn
> NullPointerException accessing a field of an invalid bag from a nested foreach
> ------------------------------------------------------------------------------
>
> Key: PIG-4376
> URL: https://issues.apache.org/jira/browse/PIG-4376
> Project: Pig
> Issue Type: Bug
> Components: parser
> Affects Versions: 0.12.0, 0.13.0, 0.14.0
> Reporter: Kevin Springborn
> Assignee: Kevin Springborn
> Priority: Minor
>
> {noformat}
> a = load 'x' as (field);
> b = foreach a {
> c = LIMIT invalidName 1;
> generate c.foo;
> }
> {noformat}
> Results in the following stack trace:
> [main] ERROR org.apache.pig.PigServer - exception during parsing: Error
> during parsing. null
> Failed to parse: null
> at
> org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:201)
> at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1735)
> at org.apache.pig.PigServer$Graph.access$000(PigServer.java:1443)
> at org.apache.pig.PigServer.parseAndBuild(PigServer.java:387)
> at org.apache.pig.PigServer.executeBatch(PigServer.java:412)
> at org.apache.pig.PigServer.executeBatch(PigServer.java:398)
> at
> org.apache.pig.tools.grunt.GruntParser.executeBatch(GruntParser.java:171)
> at
> org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:741)
> at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:372)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:230)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:205)
> at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:81)
> at org.apache.pig.Main.run(Main.java:495)
> at org.apache.pig.Main.main(Main.java:170)
> 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.run(RunJar.java:221)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
> Caused by: java.lang.NullPointerException
> at
> org.apache.pig.newplan.logical.expression.DereferenceExpression.translateAliasToPos(DereferenceExpression.java:210)
> at
> org.apache.pig.newplan.logical.expression.DereferenceExpression.getFieldSchema(DereferenceExpression.java:149)
> at
> org.apache.pig.newplan.logical.optimizer.FieldSchemaResetter.execute(SchemaResetter.java:264)
> at
> org.apache.pig.newplan.logical.expression.AllSameExpressionVisitor.visit(AllSameExpressionVisitor.java:148)
> at
> org.apache.pig.newplan.logical.expression.DereferenceExpression.accept(DereferenceExpression.java:84)
> at
> org.apache.pig.newplan.ReverseDependencyOrderWalker.walk(ReverseDependencyOrderWalker.java:70)
> at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:52)
> at
> org.apache.pig.newplan.logical.optimizer.SchemaResetter.visitAll(SchemaResetter.java:67)
> at
> org.apache.pig.newplan.logical.optimizer.SchemaResetter.visit(SchemaResetter.java:122)
> at
> org.apache.pig.newplan.logical.relational.LOGenerate.accept(LOGenerate.java:245)
> at
> org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
> at
> org.apache.pig.newplan.logical.optimizer.SchemaResetter.visit(SchemaResetter.java:114)
> at
> org.apache.pig.parser.LogicalPlanBuilder.buildForeachOp(LogicalPlanBuilder.java:1055)
> at
> org.apache.pig.parser.LogicalPlanGenerator.foreach_clause(LogicalPlanGenerator.java:15896)
> at
> org.apache.pig.parser.LogicalPlanGenerator.op_clause(LogicalPlanGenerator.java:1933)
> at
> org.apache.pig.parser.LogicalPlanGenerator.general_statement(LogicalPlanGenerator.java:1102)
> at
> org.apache.pig.parser.LogicalPlanGenerator.statement(LogicalPlanGenerator.java:560)
> at
> org.apache.pig.parser.LogicalPlanGenerator.query(LogicalPlanGenerator.java:421)
> at
> org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:191)
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