Package org.apache.flink.table.functions

Class AsyncLookupFunction

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

org.apache.flink.table.functions.AsyncTableFunction<RowData>

org.apache.flink.table.functions.AsyncLookupFunction

All Implemented Interfaces:

Serializable, FunctionDefinition

@PublicEvolving
public abstract class AsyncLookupFunction
extends AsyncTableFunction<RowData>

A wrapper class of AsyncTableFunction for asynchronously lookup rows matching the lookup keys from external system.

The output type of this table function is fixed as RowData.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
AsyncLookupFunction()

Method Summary

Modifier and Type	Method	Description
abstract CompletableFuture<Collection<RowData>>	asyncLookup(RowData keyRow)	Asynchronously lookup rows matching the lookup keys.
final void	eval(CompletableFuture<Collection<RowData>> future, Object... keys)	Invokes asyncLookup(org.apache.flink.table.data.RowData) and chains futures.

Methods inherited from class org.apache.flink.table.functions.AsyncTableFunction

getKind, getTypeInference

Methods inherited from class org.apache.flink.table.functions.UserDefinedFunction

close, functionIdentifier, open, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.table.functions.FunctionDefinition

getRequirements, isDeterministic, supportsConstantFolding

Constructor Details

AsyncLookupFunction

public AsyncLookupFunction()

Method Details

asyncLookup

public abstract CompletableFuture<Collection<RowData>> asyncLookup(RowData keyRow)

Asynchronously lookup rows matching the lookup keys.

Please note that the returning collection of RowData shouldn't be reused across invocations.

Parameters:

keyRow - - A RowData that wraps lookup keys.

Returns:

A collection of all matching rows in the lookup table.

eval

public final void eval(CompletableFuture<Collection<RowData>> future,
 Object... keys)

Invokes asyncLookup(org.apache.flink.table.data.RowData) and chains futures.