org.apache.calcite.schema.impl

Class TableFunctionImpl

java.lang.Object

org.apache.calcite.schema.impl.ReflectiveFunctionBase

org.apache.calcite.schema.impl.TableFunctionImpl

All Implemented Interfaces:

Function, ImplementableFunction, TableFunction

public class TableFunctionImpl
extends ReflectiveFunctionBase
implements TableFunction, ImplementableFunction

Implementation of TableFunction based on a method.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.calcite.schema.impl.ReflectiveFunctionBase

ReflectiveFunctionBase.ParameterListBuilder

Field Summary

Fields inherited from class org.apache.calcite.schema.impl.ReflectiveFunctionBase

method, parameters

Method Summary

Modifier and Type	Method and Description
static @Nullable TableFunction	create(Class<?> clazz) Creates a TableFunctionImpl from a class, looking for an "eval" method.
static @Nullable TableFunction	create(Class<?> clazz, String methodName) Creates a TableFunctionImpl from a class, looking for a method with a given name.
static @Nullable TableFunction	create(Method method) Creates a TableFunctionImpl from a method.
Type	getElementType(List<? extends Object> arguments) Returns the row type of the table yielded by this function when applied to given arguments.
CallImplementor	getImplementor() Returns implementor that translates the function to linq4j expression.
RelDataType	getRowType(RelDataTypeFactory typeFactory, List<? extends Object> arguments) Returns the record type of the table yielded by this function when applied to given arguments.

Methods inherited from class org.apache.calcite.schema.impl.ReflectiveFunctionBase

builder, getParameters

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.calcite.schema.Function

getParameters

Method Detail

create

public static @Nullable TableFunction create(Class<?> clazz)

Creates a TableFunctionImpl from a class, looking for an "eval" method. Returns null if there is no such method.

create

public static @Nullable TableFunction create(Class<?> clazz,
                                             String methodName)

Creates a TableFunctionImpl from a class, looking for a method with a given name. Returns null if there is no such method.

create

public static @Nullable TableFunction create(Method method)

Creates a TableFunctionImpl from a method.

getRowType

public RelDataType getRowType(RelDataTypeFactory typeFactory,
                              List<? extends Object> arguments)

Description copied from interface: TableFunction

Returns the record type of the table yielded by this function when applied to given arguments. Only literal arguments are passed, non-literal are replaced with default values (null, 0, false, etc).

Specified by:

getRowType in interface TableFunction

Parameters:

typeFactory - Type factory

arguments - arguments of a function call (only literal arguments are passed, nulls for non-literal ones)

Returns:

row type of the table

getElementType

public Type getElementType(List<? extends Object> arguments)

Description copied from interface: TableFunction

Returns the row type of the table yielded by this function when applied to given arguments. Only literal arguments are passed, non-literal are replaced with default values (null, 0, false, etc).

Specified by:

getElementType in interface TableFunction

Parameters:

arguments - arguments of a function call (only literal arguments are passed, nulls for non-literal ones)

Returns:

element type of the table (e.g. Object[].class)

getImplementor

public CallImplementor getImplementor()

Description copied from interface: ImplementableFunction

Returns implementor that translates the function to linq4j expression.

Specified by:

getImplementor in interface ImplementableFunction

Returns:

implementor that translates the function to linq4j expression.