org.apache.hadoop.hive.ql.exec

Class ExprNodeFieldEvaluator

java.lang.Object

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

org.apache.hadoop.hive.ql.exec.ExprNodeFieldEvaluator

public class ExprNodeFieldEvaluator
extends ExprNodeEvaluator<ExprNodeFieldDesc>

This Evaluator can evaluate s.f for s as both struct and list of struct. If s is struct, then s.f is the field. If s is list of struct, then s.f is the list of struct field.

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator

expr, outputOI

Constructor Summary

Constructors

Constructor and Description
ExprNodeFieldEvaluator(ExprNodeFieldDesc desc)

Method Summary

Modifier and Type	Method and Description
protected java.lang.Object	_evaluate(java.lang.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

ExprNodeFieldEvaluator

public ExprNodeFieldEvaluator(ExprNodeFieldDesc desc)
                       throws HiveException

Throws:

HiveException

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<ExprNodeFieldDesc>

Throws:

HiveException

_evaluate

protected java.lang.Object _evaluate(java.lang.Object row,
                                     int version)
                              throws HiveException

Description copied from class: ExprNodeEvaluator

Evaluate value

Specified by:

_evaluate in class ExprNodeEvaluator<ExprNodeFieldDesc>

Throws:

HiveException