org.apache.flink.table.sources

接口 LookupableTableSource<T>

类型参数:

T - type of the result

所有超级接口:

TableSource<T>

@Experimental
public interface LookupableTableSource<T>
extends TableSource<T>

A TableSource which supports for lookup accessing via key column(s). For example, MySQL TableSource can implement this interface to support lookup accessing. When temporal join this MySQL table, the runtime behavior could be in a lookup fashion.

方法概要

限定符和类型	方法和说明
AsyncTableFunction<T>	getAsyncLookupFunction(String[] lookupKeys) Gets the AsyncTableFunction which supports async lookup one key at a time.
TableFunction<T>	getLookupFunction(String[] lookupKeys) Gets the TableFunction which supports lookup one key at a time.
boolean	isAsyncEnabled() Returns true if async lookup is enabled.

从接口继承的方法 org.apache.flink.table.sources.TableSource

explainSource, getProducedDataType, getReturnType, getTableSchema

方法详细资料

getLookupFunction

TableFunction<T> getLookupFunction(String[] lookupKeys)

Gets the TableFunction which supports lookup one key at a time.

参数:

lookupKeys - the chosen field names as lookup keys, it is in the defined order

getAsyncLookupFunction

AsyncTableFunction<T> getAsyncLookupFunction(String[] lookupKeys)

Gets the AsyncTableFunction which supports async lookup one key at a time.

参数:

lookupKeys - the chosen field names as lookup keys, it is in the defined order

isAsyncEnabled

boolean isAsyncEnabled()

Returns true if async lookup is enabled.

The lookup function returned by getAsyncLookupFunction(String[]) will be used if returns true. Otherwise, the lookup function returned by getLookupFunction(String[]) will be used.