org.apache.hadoop.hive.ql.exec
Class ExprNodeConstantEvaluator

java.lang.Object
  extended by org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator
      extended by org.apache.hadoop.hive.ql.exec.ExprNodeConstantEvaluator

public class ExprNodeConstantEvaluator
extends ExprNodeEvaluator

ExprNodeConstantEvaluator.


Field Summary
protected  ExprNodeConstantDesc expr
           
 
Constructor Summary
ExprNodeConstantEvaluator(ExprNodeConstantDesc expr)
           
 
Method Summary
 Object evaluate(Object row)
          Evaluate the expression given the row.
 ObjectInspector initialize(ObjectInspector rowInspector)
          Initialize should be called once and only once.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

expr

protected ExprNodeConstantDesc expr
Constructor Detail

ExprNodeConstantEvaluator

public ExprNodeConstantEvaluator(ExprNodeConstantDesc expr)
Method Detail

initialize

public ObjectInspector initialize(ObjectInspector rowInspector)
                           throws HiveException
Description copied from class: ExprNodeEvaluator
Initialize should be called once and only once. Return the ObjectInspector for the return value, given the rowInspector.

Specified by:
initialize in class ExprNodeEvaluator
Throws:
HiveException

evaluate

public Object evaluate(Object row)
                throws HiveException
Description copied from class: ExprNodeEvaluator
Evaluate the expression given the row. This method should use the rowInspector passed in from initialize to inspect the row object. The return value will be inspected by the return value of initialize.

Specified by:
evaluate in class ExprNodeEvaluator
Throws:
HiveException


Copyright © 2011 The Apache Software Foundation