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

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

public class ExprNodeFuncEvaluator
extends ExprNodeEvaluator


Field Summary
protected  exprNodeFuncDesc expr
           
 
Constructor Summary
ExprNodeFuncEvaluator(exprNodeFuncDesc 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 exprNodeFuncDesc expr
Constructor Detail

ExprNodeFuncEvaluator

public ExprNodeFuncEvaluator(exprNodeFuncDesc 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 © 2009 The Apache Software Foundation