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

java.lang.Object
  extended by org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator<ExprNodeColumnDesc>
      extended by org.apache.hadoop.hive.ql.exec.ExprNodeColumnEvaluator

public class ExprNodeColumnEvaluator
extends ExprNodeEvaluator<ExprNodeColumnDesc>

This evaluator gets the column from the row object.


Field Summary
 
Fields inherited from class org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator
expr, outputOI
 
Constructor Summary
ExprNodeColumnEvaluator(ExprNodeColumnDesc expr)
           
 
Method Summary
protected  Object _evaluate(Object row, int version)
          Evaluate value
 ObjectInspector initialize(ObjectInspector rowInspector)
          Initialize should be called once and only once.
 
Methods inherited from class org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator
evaluate, evaluate, getChildren, getExpr, getOutputOI, isDeterministic, isStateful
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ExprNodeColumnEvaluator

public ExprNodeColumnEvaluator(ExprNodeColumnDesc 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<ExprNodeColumnDesc>
Throws:
HiveException

_evaluate

protected Object _evaluate(Object row,
                           int version)
                    throws HiveException
Description copied from class: ExprNodeEvaluator
Evaluate value

Specified by:
_evaluate in class ExprNodeEvaluator<ExprNodeColumnDesc>
Throws:
HiveException


Copyright © 2012 The Apache Software Foundation