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https://issues.apache.org/jira/browse/PIG-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12775109#action_12775109
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Ashutosh Chauhan commented on PIG-1073:
---------------------------------------

Current patch only partially fixes the problem. It seems we have bigger 
problems in a way visiting is done on query plans currently. I am working on 
fixing those.

> LogicalPlanCloner can't clone plan containing LOJoin
> ----------------------------------------------------
>
>                 Key: PIG-1073
>                 URL: https://issues.apache.org/jira/browse/PIG-1073
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         Attachments: pig-1073.patch
>
>
> Add following testcase in LogicalPlanBuilder.java
> public void testLogicalPlanCloner() throws CloneNotSupportedException{
>         LogicalPlan lp = buildPlan("C = join ( load 'A') by $0, (load 'B') by 
> $0;");
>         LogicalPlanCloner cloner = new LogicalPlanCloner(lp);
>         cloner.getClonedPlan();
>     }
> and this fails with the following stacktrace:
> java.lang.NullPointerException
>         at 
> org.apache.pig.impl.logicalLayer.LOVisitor.visit(LOVisitor.java:171)
>         at 
> org.apache.pig.impl.logicalLayer.PlanSetter.visit(PlanSetter.java:63)
>         at org.apache.pig.impl.logicalLayer.LOJoin.visit(LOJoin.java:213)
>         at org.apache.pig.impl.logicalLayer.LOJoin.visit(LOJoin.java:45)
>         at 
> org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:67)
>         at 
> org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:69)
>         at 
> org.apache.pig.impl.plan.DepthFirstWalker.walk(DepthFirstWalker.java:50)
>         at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
>         at 
> org.apache.pig.impl.logicalLayer.LogicalPlanCloneHelper.getClonedPlan(LogicalPlanCloneHelper.java:73)
>         at 
> org.apache.pig.impl.logicalLayer.LogicalPlanCloner.getClonedPlan(LogicalPlanCloner.java:46)
>         at 
> org.apache.pig.test.TestLogicalPlanBuilder.testLogicalPlanCloneHelper(TestLogicalPlanBuilder.java:2110)

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