Package org.apache.pinot.common.function

Class FunctionRegistry

java.lang.Object

org.apache.pinot.common.function.FunctionRegistry

public class FunctionRegistry
extends Object

Registry for scalar functions.

TODO: Merge FunctionRegistry and FunctionDefinitionRegistry to provide one single registry for all functions.

Method Summary

Modifier and Type	Method	Description
static boolean	containsFunction(String functionName)	Returns true if the given function name is registered, false otherwise.
static FunctionInfo	getFunctionInfo(String functionName, int numParameters)	Returns the FunctionInfo associated with the given function name and number of parameters, or null if there is no matching method.
static Map<String,List<org.apache.calcite.schema.Function>>	getRegisteredCalciteFunctionMap()
static Set<String>	getRegisteredCalciteFunctionNames()
static Collection<org.apache.calcite.schema.Function>	getRegisteredCalciteFunctions(String name)
static void	init()	Initializes the FunctionRegistry.
static void	registerFunction(Method method, boolean nullableParameters)	Registers a method with the name of the method.
static void	registerFunction(String functionName, Method method, boolean nullableParameters)	Registers a method with the given function name.

Methods inherited from class java.lang.Object

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

Method Detail

init

public static void init()

Initializes the FunctionRegistry. NOTE: This method itself is a NO-OP, but can be used to explicitly trigger the static block of registering the scalar functions via reflection.

registerFunction

public static void registerFunction(Method method,
                                    boolean nullableParameters)

Registers a method with the name of the method.

registerFunction

public static void registerFunction(String functionName,
                                    Method method,
                                    boolean nullableParameters)

Registers a method with the given function name.

getRegisteredCalciteFunctionMap

public static Map<String,List<org.apache.calcite.schema.Function>> getRegisteredCalciteFunctionMap()

getRegisteredCalciteFunctions

public static Collection<org.apache.calcite.schema.Function> getRegisteredCalciteFunctions(String name)

getRegisteredCalciteFunctionNames

public static Set<String> getRegisteredCalciteFunctionNames()

containsFunction

public static boolean containsFunction(String functionName)

Returns true if the given function name is registered, false otherwise.

getFunctionInfo

@Nullable
public static FunctionInfo getFunctionInfo(String functionName,
                                           int numParameters)

Returns the FunctionInfo associated with the given function name and number of parameters, or null if there is no matching method. This method should be called after the FunctionRegistry is initialized and all methods are already registered.