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org.apache.derby.impl.sql.compile
Class MaxMinAggregateDefinition  

java.lang.Object
  org.apache.derby.impl.sql.compile.MaxMinAggregateDefinition

All Implemented Interfaces:

AggregateDefinition

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public class MaxMinAggregateDefinition

extends java.lang.Object

implements AggregateDefinition

Defintion for the MAX()/MIN() aggregates.

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Field Summary
private  boolean	isMax

 

Constructor Summary

MaxMinAggregateDefinition()           Niladic constructor.

 

Method Summary
org.apache.derby.catalog.TypeDescriptor	getAggregator(org.apache.derby.catalog.TypeDescriptor inputType, java.lang.StringBuffer aggregatorClass)           Determines the result datatype.
boolean	isMax()           Return if the aggregator class is for min/max.
void	setMaxOrMin(boolean isMax)           This is set by the parser.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

isMax

private boolean isMax

Constructor Detail

MaxMinAggregateDefinition

public MaxMinAggregateDefinition()

Niladic constructor. Does nothing. For ease Of use, only.

Method Detail

getAggregator

public final org.apache.derby.catalog.TypeDescriptor getAggregator(org.apache.derby.catalog.TypeDescriptor inputType,
                                                                   java.lang.StringBuffer aggregatorClass)

Determines the result datatype. Accept NumberDataValues only.

Note: In the future you should be able to do a sum user data types. One option would be to run sum on anything that implements divide().

Specified by:

getAggregator in interface AggregateDefinition

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setMaxOrMin

public final void setMaxOrMin(boolean isMax)

This is set by the parser.

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isMax

public final boolean isMax()

Return if the aggregator class is for min/max.

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SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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