org.apache.flink.table.functions

类 ConstantFunctionContext

java.lang.Object

org.apache.flink.table.functions.FunctionContext

org.apache.flink.table.functions.ConstantFunctionContext

@Internal
public final class ConstantFunctionContext
extends FunctionContext

A FunctionContext for constant expression reduction. It is used when a function is called with constant expressions or constant expressions can be derived from the given statement.

Since constant expression reduction happens during planning, methods that reference Flink's runtime context are not available.

另请参阅:

FunctionDefinition.isDeterministic()

构造器概要

构造器

构造器和说明
ConstantFunctionContext(org.apache.flink.configuration.Configuration configuration)

方法概要

限定符和类型	方法和说明
File	getCachedFile(String name) Gets the local temporary file copy of a distributed cache files.
Set<org.apache.flink.api.common.externalresource.ExternalResourceInfo>	getExternalResourceInfos(String resourceName) Get the external resource information.
String	getJobParameter(String key, String defaultValue) Gets the global job parameter value associated with the given key as a string.
org.apache.flink.metrics.MetricGroup	getMetricGroup() Returns the metric group for this parallel subtask.

从类继承的方法 java.lang.Object

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

构造器详细资料

ConstantFunctionContext

public ConstantFunctionContext(org.apache.flink.configuration.Configuration configuration)

方法详细资料

getMetricGroup

public org.apache.flink.metrics.MetricGroup getMetricGroup()

从类复制的说明: FunctionContext

Returns the metric group for this parallel subtask.

覆盖:

getMetricGroup 在类中 FunctionContext

返回:

metric group for this parallel subtask.

getCachedFile

public File getCachedFile(String name)

从类复制的说明: FunctionContext

Gets the local temporary file copy of a distributed cache files.

覆盖:

getCachedFile 在类中 FunctionContext

参数:

name - distributed cache file name

返回:

local temporary file copy of a distributed cache file.

getJobParameter

public String getJobParameter(String key,
                              String defaultValue)

从类复制的说明: FunctionContext

Gets the global job parameter value associated with the given key as a string.

覆盖:

getJobParameter 在类中 FunctionContext

参数:

key - key pointing to the associated value

defaultValue - default value which is returned in case global job parameter is null or there is no value associated with the given key

返回:

(default) value associated with the given key

getExternalResourceInfos

public Set<org.apache.flink.api.common.externalresource.ExternalResourceInfo> getExternalResourceInfos(String resourceName)

从类复制的说明: FunctionContext

Get the external resource information.

覆盖:

getExternalResourceInfos 在类中 FunctionContext