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.

Field Summary

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

method, parameters

Method Summary

Methods

Modifier and Type	Method and Description
static TableFunction	create(Class<?> clazz) Creates a TableFunctionImpl from a class, looking for an "eval" method.
static TableFunction	create(Method method) Creates a TableFunctionImpl from a 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

getParameters, toFunctionParameters, toFunctionParameters

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 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(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.