Cheolsoo Park created PIG-4169:
----------------------------------
Summary: NPE in ConstantCalculator
Key: PIG-4169
URL: https://issues.apache.org/jira/browse/PIG-4169
Project: Pig
Issue Type: Bug
Components: impl
Reporter: Cheolsoo Park
Assignee: Cheolsoo Park
Fix For: 0.14.0
To reproduce the issue, run the following query-
{code}
a = LOAD 'foo' AS (x:int);
b = FOREACH a GENERATE TOTUPLE((chararray)null);
DUMP b;
{code}
As can be seen, it is calling TOTUPLE with null. This causes a front-end
exception with the following stack trace-
{code}
Caused by: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 0:
org.apache.pig.backend.executionengine.ExecException: ERROR 0: Exception while
executing [POUserFunc (Name: POUserFunc(org.apache.pig.builtin.TOTUPLE)[tuple]
- scope-13 Operator Key: scope-13) children: null at []]:
java.lang.NullPointerException
at
org.apache.pig.newplan.logical.rules.ConstantCalculator$ConstantCalculatorTransformer$ConstantCalculatorExpressionVisitor.execute(ConstantCalculator.java:154)
at
org.apache.pig.newplan.logical.expression.AllSameExpressionVisitor.visit(AllSameExpressionVisitor.java:143)
at
org.apache.pig.newplan.logical.expression.UserFuncExpression.accept(UserFuncExpression.java:112)
at
org.apache.pig.newplan.ReverseDependencyOrderWalkerWOSeenChk.walk(ReverseDependencyOrderWalkerWOSeenChk.java:69)
at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:52)
at
org.apache.pig.newplan.logical.optimizer.AllExpressionVisitor.visitAll(AllExpressionVisitor.java:72)
at
org.apache.pig.newplan.logical.optimizer.AllExpressionVisitor.visit(AllExpressionVisitor.java:131)
at
org.apache.pig.newplan.logical.relational.LOGenerate.accept(LOGenerate.java:245)
at
org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
at
org.apache.pig.newplan.logical.optimizer.AllExpressionVisitor.visit(AllExpressionVisitor.java:124)
at
org.apache.pig.newplan.logical.relational.LOForEach.accept(LOForEach.java:87)
at
org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:52)
at
org.apache.pig.newplan.logical.rules.ConstantCalculator$ConstantCalculatorTransformer.transform(ConstantCalculator.java:181)
at
org.apache.pig.newplan.optimizer.PlanOptimizer.optimize(PlanOptimizer.java:110)
... 16 more
Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 0:
Exception while executing [POUserFunc (Name:
POUserFunc(org.apache.pig.builtin.TOTUPLE)[tuple] - scope-13 Operator Key:
scope-13) children: null at []]: java.lang.NullPointerException
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:360)
at
org.apache.pig.newplan.logical.rules.ConstantCalculator$ConstantCalculatorTransformer$ConstantCalculatorExpressionVisitor.execute(ConstantCalculator.java:151)
... 30 more
Caused by: java.lang.NullPointerException
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:284)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNextTuple(POUserFunc.java:383)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:355)
... 31 more
{code}
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