Package io.trino.operator

Class EmptyTableFunctionPartition

java.lang.Object

io.trino.operator.EmptyTableFunctionPartition

All Implemented Interfaces:

TableFunctionPartition

public class EmptyTableFunctionPartition
extends Object
implements TableFunctionPartition

This is a class representing empty input to a table function. An EmptyTableFunctionPartition is created when the table function has KEEP WHEN EMPTY property, which means that the function should be executed even if the input is empty, and all the table arguments are empty relations.

An EmptyTableFunctionPartition is created and processed once per node. To avoid duplicated execution, a table function having KEEP WHEN EMPTY property must have single distribution.

Constructor Summary

Constructors

Constructor	Description
EmptyTableFunctionPartition(TableFunctionDataProcessor tableFunction, int properChannelsCount, int passThroughSourcesCount, List<Type> passThroughTypes)

Method Summary

Modifier and Type	Method	Description
WorkProcessor<Page>	toOutputPages()

Methods inherited from class java.lang.Object

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

Constructor Details

EmptyTableFunctionPartition

public EmptyTableFunctionPartition(TableFunctionDataProcessor tableFunction,
 int properChannelsCount,
 int passThroughSourcesCount,
 List<Type> passThroughTypes)

Method Details

toOutputPages

public WorkProcessor<Page> toOutputPages()

Specified by:

toOutputPages in interface TableFunctionPartition