[PIG-407] Explain followed by Describe throws exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.2.0
• Fix Version/s: 0.2.0
• Component/s: impl
• Patch Info: Patch Available
• Assignee: Pradeep Kamath
• Reporter: Santhosh Muthur Srinivasan
• Created: 30/Aug/08 01:08
• Updated: 24/Mar/10 22:04
• Resolved: 12/Sep/08 18:56

Description

A = load '/user/sms/data/student.data' using PigStorage(' ') as (name: chararray, age: int, gpa: float);
B = group A by $1;
C = foreach B{ D = order A by $0; generate D; }
describe C;
describe B;
explain C;
describe B;


56335 [main] ERROR org.apache.pig.tools.grunt.GruntParser  - java.lang.NullPointerException
        at org.apache.pig.impl.logicalLayer.LOVisitor.visit(LOVisitor.java:121)
        at org.apache.pig.impl.logicalLayer.PlanSetter.visit(PlanSetter.java:58)
        at org.apache.pig.impl.logicalLayer.LOCogroup.visit(LOCogroup.java:262)
        at org.apache.pig.impl.logicalLayer.LOCogroup.visit(LOCogroup.java:39)
        at org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:65)
        at org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:67)
        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.PigServer.compileLp(PigServer.java:549)
        at org.apache.pig.PigServer.dumpSchema(PigServer.java:285)
        at org.apache.pig.tools.grunt.GruntParser.processDescribe(GruntParser.java:149)
        at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:181)
        at org.apache.pig.tools.grunt.GruntParser.parseContOnError(GruntParser.java:92)
        at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:58)
        at org.apache.pig.Main.main(Main.java:282)