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

java.lang.Object
  org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator<ExprNodeGenericFuncDesc>
      org.apache.hadoop.hive.ql.exec.ExprNodeGenericFuncEvaluator

public class ExprNodeGenericFuncEvaluator
extends ExprNodeEvaluator<ExprNodeGenericFuncDesc>

ExprNodeGenericFuncEvaluator.

Field Summary

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

expr, outputOI

Constructor Summary

ExprNodeGenericFuncEvaluator(ExprNodeGenericFuncDesc expr)

Method Summary

protected Object	_evaluate(Object row, int version) Evaluate value
Integer	compare(Object row) If the genericUDF is a base comparison, it returns an integer based on the result of comparing the two sides of the UDF, like the compareTo method in Comparable.
ExprNodeEvaluator[]	getChildren() Return child evaluators if exist
ObjectInspector	initialize(ObjectInspector rowInspector) Initialize should be called once and only once.
boolean	isDeterministic() Return whether this node (and all children nodes) are deterministic.
boolean	isStateful() Return whether this node (or any children nodes) are stateful.

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

evaluate, evaluate, getExpr, getOutputOI

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprNodeGenericFuncEvaluator

public ExprNodeGenericFuncEvaluator(ExprNodeGenericFuncDesc expr)
                             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<ExprNodeGenericFuncDesc>

Throws:

HiveException

isDeterministic

public boolean isDeterministic()

Description copied from class: ExprNodeEvaluator

Return whether this node (and all children nodes) are deterministic.

Overrides:

isDeterministic in class ExprNodeEvaluator<ExprNodeGenericFuncDesc>

getChildren

public ExprNodeEvaluator[] getChildren()

Description copied from class: ExprNodeEvaluator

Return child evaluators if exist

Overrides:

getChildren in class ExprNodeEvaluator<ExprNodeGenericFuncDesc>

isStateful

public boolean isStateful()

Description copied from class: ExprNodeEvaluator

Return whether this node (or any children nodes) are stateful.

Overrides:

isStateful in class ExprNodeEvaluator<ExprNodeGenericFuncDesc>

_evaluate

protected Object _evaluate(Object row,
                           int version)
                    throws HiveException

Description copied from class: ExprNodeEvaluator

Evaluate value

Specified by:

_evaluate in class ExprNodeEvaluator<ExprNodeGenericFuncDesc>

Throws:

HiveException

compare

public Integer compare(Object row)
                throws HiveException

If the genericUDF is a base comparison, it returns an integer based on the result of comparing the two sides of the UDF, like the compareTo method in Comparable. If the genericUDF is not a base comparison, or there is an error executing the comparison, it returns null.

Parameters:

row -

Returns:

the compare results

Throws:

HiveException