NPE for co-group with group-by column having complex schema and different load
functions for each input
-------------------------------------------------------------------------------------------------------
Key: PIG-2018
URL: https://issues.apache.org/jira/browse/PIG-2018
Project: Pig
Issue Type: Bug
Reporter: Thejas M Nair
Assignee: Thejas M Nair
Fix For: 0.9.0
{code}
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
{code}
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