Uses of Class
edu.caltech.nanodb.functions.Function

Packages that use Function

Package	Description
edu.caltech.nanodb.expressions	This package contains classes for representing and evaluating arithmetic and logical expressions.
edu.caltech.nanodb.functions	This package contains the abstractions for supporting simple functions, aggregate functions, and table-returning functions in NanoDB.

Uses of Function in edu.caltech.nanodb.expressions

Fields in edu.caltech.nanodb.expressions declared as Function

Modifier and Type	Field	Description
private Function	FunctionCall.function	The actual function object that implements the function call.

Methods in edu.caltech.nanodb.expressions that return Function

Modifier and Type	Method	Description
Function	FunctionCall.getFunction()	Returns the implementation of the function, or null if the implementation has not yet been resolved via the FunctionCall.resolve(edu.caltech.nanodb.functions.FunctionDirectory) method.

Uses of Function in edu.caltech.nanodb.functions

Subclasses of Function in edu.caltech.nanodb.functions

Modifier and Type	Class	Description
class	Abs	Implementation of the ABS(x) SQL function, computes the absolute value of a single argument.
class	AggregateFunction	This class provides the general abstraction for aggregate functions.
class	ArcCos	Implementation of the ACOS(x) SQL function, computes the arc-cosine of a single argument.
class	ArcSin	Implementation of the ASIN(x) SQL function, computes the arc-sine of a single argument.
class	ArcTan	Implementation of the ATAN(x) SQL function, computes the arc-tangent of a single argument.
class	ArcTan2	Implementation of the ATAN2(y, x) SQL function, computes the arc-tangent of two arguments.
class	Avg	Implementation of the AVG(x) SQL aggregate function, computes the average of its inputs.
class	AvgDistinct	Implementation of the AVG(DISTINCT x) SQL aggregate function, computes the average of its inputs.
class	Ceil	Implementation of the CEIL(x) / CEILING(x) SQL function, computes the smallest whole number larger than the argument.
class	Coalesce	Implementation of the COALESCE(a, b, ...) SQL function, returns the first non-NULL argument.
class	Concat	Implementation of the CONCAT(s1, s2, ...) SQL function, concatenates two or more arguments as strings.
class	Cos	Implementation of the COS(x) SQL function, computes the cosine of a single argument.
class	Count	Created by donnie on 12/6/13.
class	CountAggregate	This aggregate function can be used to compute both COUNT(...) and COUNT(DISTINCT ...) aggregate functions.
class	CountDistinct	Created by donnie on 12/7/13.
class	CountStar	Created by donnie on 11/1/14.
class	Floor	Computes the largest whole number smaller than the argument.
class	Greatest	Returns the greatest value of all arguments.
class	If	Implements IF (cond, expr1, expr2).
class	IfNull	Implements IFNULL(expr1, expr2).
class	Least	Returns the least value of all arguments.
class	Max	Created by donnie on 12/7/13.
class	Min	Created by donnie on 12/7/13.
class	MinMaxAggregate	This aggregate function can be used to compute either the minimum or the maximum of a collection of values.
class	NullIf	Implements NULLIF(cond, expr).
class	Pow	Returns the first argument, raised to the second argument power.
class	ReadPerfCounter	Returns the current value of the specified performance counter.
class	ResetPerfCounter	Resets the specified performance counter, and returns the old value.
class	Round	Computes the whole number that is closest to the argument.
class	ScalarFunction	This class represents functions that return a scalar value.
class	SimpleFunction	Created by donnie on 12/5/13.
class	Sin	Implementation of the SIN(x) SQL function, computes the sine of a single argument.
class	Sqrt	Computes the square root of a single argument.
class	StdDev	Created by donnie on 12/7/13.
class	StdDevVarAggregate	This aggregate function can be used to compute either the standard deviation or the variance of a collection of values.
class	Sum	Created by donnie on 12/7/13.
class	SumAvgAggregate	This aggregate function can be used to compute both SUM and AVERAGE functions.
class	SumDistinct	Created by donnie on 12/7/13.
class	TableFunction	This is the base-class for all table-returning functions.
class	Tan	Implementation of the TAN(x) SQL function, computes the tangent of a single argument.
class	Variance	Created by donnie on 12/7/13.

Fields in edu.caltech.nanodb.functions with type parameters of type Function

Modifier and Type	Field	Description
private java.util.concurrent.ConcurrentHashMap<java.lang.String,java.lang.Class<? extends Function>>	FunctionDirectory.functions	This map holds the association of function names to their implementations.

Methods in edu.caltech.nanodb.functions that return Function

Modifier and Type	Method	Description
Function	FunctionDirectory.getFunction(java.lang.String funcName)	If the specified function name corresponds to an existing function, this method instantiates a new object that can compute the function, and then returns it.

Method parameters in edu.caltech.nanodb.functions with type arguments of type Function

Modifier and Type	Method	Description
void	FunctionDirectory.addFunction(java.lang.String funcName, java.lang.Class<? extends Function> impl)	Add a function to the directory.