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

Modifier and Type	Field and Description
private CallImplementor	implementor

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

method, parameters

Constructor Summary

Constructors

Modifier	Constructor and Description
private	TableFunctionImpl(Method method, CallImplementor implementor) Private constructor; use create(java.lang.Class<?>).

Method Summary

Modifier and Type	Method and Description
private Table	apply(List<Object> arguments)
static TableFunction	create(Class<?> clazz) Creates a TableFunctionImpl from a class, looking for an "eval" method.
static TableFunction	create(Class<?> clazz, String methodName) Creates a TableFunctionImpl from a class, looking for a method with a given name.
static TableFunction	create(Method method) Creates a TableFunctionImpl from a method.
private static CallImplementor	createImplementor(Method method)
Type	getElementType(List<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<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, classHasPublicZeroArgsConstructor, findMethod, 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

Field Detail

implementor

private final CallImplementor implementor

Constructor Detail

TableFunctionImpl

private TableFunctionImpl(Method method,
                          CallImplementor implementor)

Private constructor; use create(java.lang.Class<?>).

Method Detail

create

public static 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 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 TableFunction create(Method method)

Creates a TableFunctionImpl from a method.

getRowType

public RelDataType getRowType(RelDataTypeFactory typeFactory,
                              List<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<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.

createImplementor

private static CallImplementor createImplementor(Method method)

apply

private Table apply(List<Object> arguments)