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https://issues.apache.org/jira/browse/PIG-2312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Vivek Padmanabhan updated PIG-2312:
-----------------------------------
Attachment: PIG-2312_1.patch
> NPE when relation and column share the same name and used in Nested Foreach
> ----------------------------------------------------------------------------
>
> Key: PIG-2312
> URL: https://issues.apache.org/jira/browse/PIG-2312
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Vivek Padmanabhan
> Fix For: 0.10
>
> Attachments: PIG-2312_1.patch
>
>
> With Pig0.9, if a relation and a column has the same name and if the column
> is used in a nested foreach, the script execution fails
> while compiling.
> The below is the trace;
> {code}
> java.lang.NullPointerException
> at
> org.apache.pig.newplan.logical.visitor.ScalarVisitor$1.visit(ScalarVisitor.java:63)
> at
> org.apache.pig.newplan.logical.expression.ScalarExpression.accept(ScalarExpression.java:109)
> at
> org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
> at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:50)
> at
> org.apache.pig.newplan.logical.optimizer.AllExpressionVisitor.visit(AllExpressionVisitor.java:142)
> at
> org.apache.pig.newplan.logical.relational.LOSort.accept(LOSort.java:119)
> at
> org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
> at
> org.apache.pig.newplan.logical.optimizer.AllExpressionVisitor.visit(AllExpressionVisitor.java:104)
> at
> org.apache.pig.newplan.logical.relational.LOForEach.accept(LOForEach.java:74)
> at
> org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
> at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:50)
> at org.apache.pig.PigServer$Graph.compile(PigServer.java:1674)
> at org.apache.pig.PigServer$Graph.compile(PigServer.java:1666)
> at org.apache.pig.PigServer$Graph.access$200(PigServer.java:1391)
> at org.apache.pig.PigServer.execute(PigServer.java:1293)
> at org.apache.pig.PigServer.executeBatch(PigServer.java:359)
> 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:81)
> at org.apache.pig.Main.run(Main.java:553)
> at org.apache.pig.Main.main(Main.java:108)
> {code}
> This could be reproduced with the below script
> {code}
> f3 = load 'input.txt' as (a1:chararray);
> A = load '3char_1long_tab' as (f1:chararray, f2:chararray,
> f3:chararray,ct:long);
> B = GROUP A BY f1;
> C = FOREACH B {
> zip_ordered = ORDER A BY f3 ASC;
> GENERATE
> FLATTEN(group) AS f1,
> A.(f3, ct),
> COUNT(zip_ordered),
> SUM(A.ct) AS total;
> };
> STORE C INTO 'deletemeanytimeplease';
> {code}
> Checked with a unit test in trunk, the behavior is still same.
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