org.apache.pig.newplan.logical.visitor
Class ScalarVariableValidator

java.lang.Object
  org.apache.pig.newplan.PlanVisitor
      org.apache.pig.newplan.logical.relational.LogicalRelationalNodesVisitor
          org.apache.pig.newplan.logical.visitor.ScalarVariableValidator

public class ScalarVariableValidator
extends LogicalRelationalNodesVisitor

This validator checks the correctness of use of scalar variables in logical operators. It assesses the validity of the expression by making sure there is no projection in it. Currently it works for Limit and Sample (see PIG-1926)

Nested Class Summary

static class

ScalarVariableValidator.ProjectFinder

Field Summary

static String

ERR_MSG_SCALAR

Fields inherited from class org.apache.pig.newplan.PlanVisitor

currentWalker, DEFAULT_SCOPE, plan

Constructor Summary

ScalarVariableValidator(OperatorPlan plan)

Method Summary

void	visit(LOFilter filter)
void	visit(LOLimit limit)

Methods inherited from class org.apache.pig.newplan.logical.relational.LogicalRelationalNodesVisitor

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class org.apache.pig.newplan.PlanVisitor

getPlan, popWalker, pushWalker, visit

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ERR_MSG_SCALAR

public static final String ERR_MSG_SCALAR

See Also:

Constant Field Values

Constructor Detail

ScalarVariableValidator

public ScalarVariableValidator(OperatorPlan plan)
                        throws FrontendException

Throws:

FrontendException

Method Detail

visit

public void visit(LOLimit limit)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOFilter filter)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException