org.apache.hadoop.hive.ql.exec

Class ExprNodeColumnEvaluator

java.lang.Object

org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator<ExprNodeColumnDesc>

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

conf, expr, outputOI

Constructor Summary

Constructors

Constructor and Description
ExprNodeColumnEvaluator(ExprNodeColumnDesc expr, org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
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, getConf, getExpr, getOutputOI, isConsistentWithinQuery, isDeterministic, isRuntimeConstant, isStateful, setConf, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprNodeColumnEvaluator

public ExprNodeColumnEvaluator(ExprNodeColumnDesc expr,
                               org.apache.hadoop.conf.Configuration conf)

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