[PIG-2018] NPE for co-group with group-by column having complex schema and different load functions for each input

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.9.0
• Assignee: Thejas Nair
• Reporter: Thejas Nair
• Created: 27/Apr/11 23:30
• Updated: 04/Aug/11 00:34
• Resolved: 30/Apr/11 00:13

Description

l1 = load 'x' using PigStorage(':') as (a : (i : int),b,c);
l2 = load 'x' as (a,b,c);
cg = cogroup l1 by a, l2 by a;
explain cg;

Gives -
ERROR 1067: Unable to explain alias cg

org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1067: Unable to explain alias cg
        at org.apache.pig.PigServer.explain(PigServer.java:1075)
        at org.apache.pig.tools.grunt.GruntParser.explainCurrentBatch(GruntParser.java:381)
        at org.apache.pig.tools.grunt.GruntParser.processExplain(GruntParser.java:313)
        at org.apache.pig.tools.grunt.GruntParser.processExplain(GruntParser.java:276)
        at org.apache.pig.tools.pigscript.parser.PigScriptParser.Explain(PigScriptParser.java:665)
        at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:325)
        at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:176)
        at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:152)
        at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:90)
        at org.apache.pig.Main.run(Main.java:554)
        at org.apache.pig.Main.main(Main.java:109)
Caused by: java.lang.NullPointerException
        at org.apache.pig.newplan.logical.visitor.LineageFindRelVisitor.mapMatchLoadFuncToUid(LineageFindRelVisitor.java:528)
        at org.apache.pig.newplan.logical.visitor.LineageFindRelVisitor.visit(LineageFindRelVisitor.java:287)
        at org.apache.pig.newplan.logical.relational.LOCogroup.accept(LOCogroup.java:235)
        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.visitor.CastLineageSetter.<init>(CastLineageSetter.java:57)
        at org.apache.pig.PigServer$Graph.compile(PigServer.java:1683)
        at org.apache.pig.PigServer$Graph.compile(PigServer.java:1659)
        at org.apache.pig.PigServer$Graph.access$200(PigServer.java:1389)
        at org.apache.pig.PigServer.buildStorePlan(PigServer.java:1277)
        at org.apache.pig.PigServer.explain(PigServer.java:1038)
        ... 10 more