org.apache.flink.table.runtime.generated

接口 AggsHandleFunctionBase

所有超级接口:

org.apache.flink.api.common.functions.Function, Serializable

所有已知子接口:

AggsHandleFunction, TableAggsHandleFunction

public interface AggsHandleFunctionBase
extends org.apache.flink.api.common.functions.Function

The base class for handling aggregate or table aggregate functions.

It is code generated to handle all AggregateFunctions and TableAggregateFunctions together in an aggregation.

It is the entry point for aggregate operators to operate all AggregateFunctions and TableAggregateFunctions.

方法概要

限定符和类型	方法和说明
void	accumulate(BaseRow input) Accumulates the input values to the accumulators.
void	cleanup() Cleanup for the retired accumulators state.
void	close() Tear-down method for this function.
BaseRow	createAccumulators() Initializes the accumulators and save them to a accumulators row.
BaseRow	getAccumulators() Gets the current accumulators (saved in a row) which contains the current aggregated results.
void	merge(BaseRow accumulators) Merges the other accumulators into current accumulators.
void	open(StateDataViewStore store) Initialization method for the function.
void	resetAccumulators() Resets all the accumulators.
void	retract(BaseRow input) Retracts the input values from the accumulators.
void	setAccumulators(BaseRow accumulators) Set the current accumulators (saved in a row) which contains the current aggregated results.

方法详细资料

open

void open(StateDataViewStore store)
   throws Exception

Initialization method for the function. It is called before the actual working methods.

抛出:

Exception

accumulate

void accumulate(BaseRow input)
         throws Exception

Accumulates the input values to the accumulators.

参数:

input - input values bundled in a row

抛出:

Exception

retract

void retract(BaseRow input)
      throws Exception

Retracts the input values from the accumulators.

参数:

input - input values bundled in a row

抛出:

Exception

merge

void merge(BaseRow accumulators)
    throws Exception

Merges the other accumulators into current accumulators.

参数:

accumulators - The other row of accumulators

抛出:

Exception

setAccumulators

void setAccumulators(BaseRow accumulators)
              throws Exception

Set the current accumulators (saved in a row) which contains the current aggregated results. In streaming: accumulators are store in the state, we need to restore aggregate buffers from state. In batch: accumulators are store in the hashMap, we need to restore aggregate buffers from hashMap.

参数:

accumulators - current accumulators

抛出:

Exception

resetAccumulators

void resetAccumulators()
                throws Exception

Resets all the accumulators.

抛出:

Exception

getAccumulators

BaseRow getAccumulators()
                 throws Exception

Gets the current accumulators (saved in a row) which contains the current aggregated results.

返回:

the current accumulators

抛出:

Exception

createAccumulators

BaseRow createAccumulators()
                    throws Exception

Initializes the accumulators and save them to a accumulators row.

返回:

a row of accumulators which contains the aggregated results

抛出:

Exception

cleanup

void cleanup()
      throws Exception

Cleanup for the retired accumulators state.

抛出:

Exception

close

void close()
    throws Exception

Tear-down method for this function. It can be used for clean up work. By default, this method does nothing.

抛出:

Exception