org.apache.cassandra.cql3.functions

Class AggregateFcts

java.lang.Object

org.apache.cassandra.cql3.functions.AggregateFcts

public abstract class AggregateFcts
extends java.lang.Object

Factory methods for aggregate functions.

Field Summary

Fields

Modifier and Type	Field and Description
static AggregateFunction	avgFunctionForByte AVG function for byte values (tinyint).
static AggregateFunction	avgFunctionForCounter AVG function for counter column values.
static AggregateFunction	avgFunctionForDecimal The AVG function for decimal values.
static AggregateFunction	avgFunctionForDouble AVG function for double values.
static AggregateFunction	avgFunctionForFloat AVG function for float values.
static AggregateFunction	avgFunctionForInt32 AVG function for int32 values.
static AggregateFunction	avgFunctionForLong AVG function for long values.
static AggregateFunction	avgFunctionForShort AVG function for for short values (smallint).
static AggregateFunction	avgFunctionForVarint The AVG function for varint values.
static AggregateFunction	countRowsFunction The function used to count the number of rows of a result set.
static AggregateFunction	maxFunctionForCounter MAX function for counter column values.
static AggregateFunction	minFunctionForCounter The MIN function for counter column values.
static AggregateFunction	sumFunctionForByte The SUM function for byte values (tinyint).
static AggregateFunction	sumFunctionForCounter The SUM function for counter column values.
static AggregateFunction	sumFunctionForDecimal The SUM function for decimal values.
static AggregateFunction	sumFunctionForDouble The SUM function for double values.
static AggregateFunction	sumFunctionForFloat The SUM function for float values.
static AggregateFunction	sumFunctionForInt32 The SUM function for int32 values.
static AggregateFunction	sumFunctionForLong The SUM function for long values.
static AggregateFunction	sumFunctionForShort The SUM function for short values (smallint).
static AggregateFunction	sumFunctionForVarint The SUM function for varint values.

Constructor Summary

Constructors

Constructor and Description
AggregateFcts()

Method Summary

Modifier and Type	Method and Description
static java.util.Collection<AggregateFunction>	all()
static boolean	isCountRows(Function function) Checks if the specified function is the count rows (e.g.
static AggregateFunction	makeCountFunction(AbstractType<?> inputType) Creates a COUNT function for the specified type.
static AggregateFunction	makeMaxFunction(AbstractType<?> inputType) Creates a MAX function for the specified type.
static AggregateFunction	makeMinFunction(AbstractType<?> inputType) Creates a MIN function for the specified type.

Methods inherited from class java.lang.Object

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

Field Detail

countRowsFunction

public static final AggregateFunction countRowsFunction

The function used to count the number of rows of a result set. This function is called when COUNT(*) or COUNT(1) is specified.

sumFunctionForDecimal

public static final AggregateFunction sumFunctionForDecimal

The SUM function for decimal values.

avgFunctionForDecimal

public static final AggregateFunction avgFunctionForDecimal

The AVG function for decimal values.

sumFunctionForVarint

public static final AggregateFunction sumFunctionForVarint

The SUM function for varint values.

avgFunctionForVarint

public static final AggregateFunction avgFunctionForVarint

The AVG function for varint values.

sumFunctionForByte

public static final AggregateFunction sumFunctionForByte

The SUM function for byte values (tinyint).

avgFunctionForByte

public static final AggregateFunction avgFunctionForByte

AVG function for byte values (tinyint).

sumFunctionForShort

public static final AggregateFunction sumFunctionForShort

The SUM function for short values (smallint).

avgFunctionForShort

public static final AggregateFunction avgFunctionForShort

AVG function for for short values (smallint).

sumFunctionForInt32

public static final AggregateFunction sumFunctionForInt32

The SUM function for int32 values.

avgFunctionForInt32

public static final AggregateFunction avgFunctionForInt32

AVG function for int32 values.

sumFunctionForLong

public static final AggregateFunction sumFunctionForLong

The SUM function for long values.

avgFunctionForLong

public static final AggregateFunction avgFunctionForLong

AVG function for long values.

sumFunctionForFloat

public static final AggregateFunction sumFunctionForFloat

The SUM function for float values.

avgFunctionForFloat

public static final AggregateFunction avgFunctionForFloat

AVG function for float values.

sumFunctionForDouble

public static final AggregateFunction sumFunctionForDouble

The SUM function for double values.

avgFunctionForDouble

public static final AggregateFunction avgFunctionForDouble

AVG function for double values.

sumFunctionForCounter

public static final AggregateFunction sumFunctionForCounter

The SUM function for counter column values.

avgFunctionForCounter

public static final AggregateFunction avgFunctionForCounter

AVG function for counter column values.

minFunctionForCounter

public static final AggregateFunction minFunctionForCounter

The MIN function for counter column values.

maxFunctionForCounter

public static final AggregateFunction maxFunctionForCounter

MAX function for counter column values.

Constructor Detail

AggregateFcts

public AggregateFcts()

Method Detail

all

public static java.util.Collection<AggregateFunction> all()

isCountRows

public static boolean isCountRows(Function function)

Checks if the specified function is the count rows (e.g. COUNT(*) or COUNT(1)) function.

Parameters:

function - the function to check

Returns:

true if the specified function is the count rows one, false otherwise.

makeMaxFunction

public static AggregateFunction makeMaxFunction(AbstractType<?> inputType)

Creates a MAX function for the specified type.

Parameters:

inputType - the function input and output type

Returns:

a MAX function for the specified type.

makeMinFunction

public static AggregateFunction makeMinFunction(AbstractType<?> inputType)

Creates a MIN function for the specified type.

Parameters:

inputType - the function input and output type

Returns:

a MIN function for the specified type.

makeCountFunction

public static AggregateFunction makeCountFunction(AbstractType<?> inputType)

Creates a COUNT function for the specified type.

Parameters:

inputType - the function input type

Returns:

a COUNT function for the specified type.