org.apache.flink.api.java.operators

类 SortedGrouping<T>

java.lang.Object

org.apache.flink.api.java.operators.Grouping<T>

org.apache.flink.api.java.operators.SortedGrouping<T>

类型参数:

T - The type of the elements of the sorted and grouped DataSet.

已过时。

All Flink DataSet APIs are deprecated since Flink 1.18 and will be removed in a future Flink major version. You can still build your application in DataSet, but you should move to either the DataStream and/or Table API.

@Deprecated
 @Public
public class SortedGrouping<T>
extends Grouping<T>

SortedGrouping is an intermediate step for a transformation on a grouped and sorted DataSet.

The following transformation can be applied on sorted groups:

• reduceGroup(org.apache.flink.api.common.functions.GroupReduceFunction),

另请参阅:

FLIP-131: Consolidate the user-facing Dataflow SDKs/APIs (and deprecate the DataSet API

字段概要

从类继承的字段 org.apache.flink.api.java.operators.Grouping

customPartitioner, inputDataSet, keys

构造器概要

构造器

构造器和说明
SortedGrouping(DataSet<T> set, org.apache.flink.api.common.operators.Keys<T> keys, int field, org.apache.flink.api.common.operators.Order order) 已过时。
SortedGrouping(DataSet<T> set, org.apache.flink.api.common.operators.Keys<T> keys, org.apache.flink.api.common.operators.Keys.SelectorFunctionKeys<T,K> keySelector, org.apache.flink.api.common.operators.Order order) 已过时。
SortedGrouping(DataSet<T> set, org.apache.flink.api.common.operators.Keys<T> keys, String field, org.apache.flink.api.common.operators.Order order) 已过时。

方法概要

限定符和类型	方法和说明
<R> GroupCombineOperator<T,R>	combineGroup(org.apache.flink.api.common.functions.GroupCombineFunction<T,R> combiner) 已过时。 Applies a GroupCombineFunction on a grouped DataSet.
GroupReduceOperator<T,T>	first(int n) 已过时。 Returns a new set containing the first n elements in this grouped and sorted DataSet.
protected org.apache.flink.api.common.operators.Ordering	getGroupOrdering() 已过时。
protected int[]	getGroupSortKeyPositions() 已过时。
protected org.apache.flink.api.common.operators.Order[]	getGroupSortOrders() 已过时。
protected org.apache.flink.api.common.operators.Keys.SelectorFunctionKeys<T,?>	getSortSelectionFunctionKey() 已过时。
<R> GroupReduceOperator<T,R>	reduceGroup(org.apache.flink.api.common.functions.GroupReduceFunction<T,R> reducer) 已过时。 Applies a GroupReduce transformation on a grouped and sorted DataSet.
SortedGrouping<T>	sortGroup(int field, org.apache.flink.api.common.operators.Order order) 已过时。 Sorts Tuple elements within a group on the specified field in the specified Order.
SortedGrouping<T>	sortGroup(String field, org.apache.flink.api.common.operators.Order order) 已过时。 Sorts Tuple or POJO elements within a group on the specified field in the specified Order.
SortedGrouping<T>	withPartitioner(org.apache.flink.api.common.functions.Partitioner<?> partitioner) 已过时。 Uses a custom partitioner for the grouping.

从类继承的方法 org.apache.flink.api.java.operators.Grouping

getCustomPartitioner, getInputDataSet, getKeys

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

SortedGrouping

public SortedGrouping(DataSet<T> set,
                      org.apache.flink.api.common.operators.Keys<T> keys,
                      int field,
                      org.apache.flink.api.common.operators.Order order)

已过时。

SortedGrouping

public SortedGrouping(DataSet<T> set,
                      org.apache.flink.api.common.operators.Keys<T> keys,
                      String field,
                      org.apache.flink.api.common.operators.Order order)

已过时。

SortedGrouping

public SortedGrouping(DataSet<T> set,
                      org.apache.flink.api.common.operators.Keys<T> keys,
                      org.apache.flink.api.common.operators.Keys.SelectorFunctionKeys<T,K> keySelector,
                      org.apache.flink.api.common.operators.Order order)

已过时。

方法详细资料

getGroupSortKeyPositions

protected int[] getGroupSortKeyPositions()

已过时。

getGroupSortOrders

protected org.apache.flink.api.common.operators.Order[] getGroupSortOrders()

已过时。

getGroupOrdering

protected org.apache.flink.api.common.operators.Ordering getGroupOrdering()

已过时。

withPartitioner

public SortedGrouping<T> withPartitioner(org.apache.flink.api.common.functions.Partitioner<?> partitioner)

已过时。

Uses a custom partitioner for the grouping.

参数:

partitioner - The custom partitioner.

返回:

The grouping object itself, to allow for method chaining.

getSortSelectionFunctionKey

protected org.apache.flink.api.common.operators.Keys.SelectorFunctionKeys<T,?> getSortSelectionFunctionKey()

已过时。

reduceGroup

public <R> GroupReduceOperator<T,R> reduceGroup(org.apache.flink.api.common.functions.GroupReduceFunction<T,R> reducer)

已过时。

Applies a GroupReduce transformation on a grouped and sorted DataSet.

The transformation calls a RichGroupReduceFunction for each group of the DataSet. A GroupReduceFunction can iterate over all elements of a group and emit any number of output elements including none.

参数:

reducer - The GroupReduceFunction that is applied on each group of the DataSet.

返回:

A GroupReduceOperator that represents the reduced DataSet.

另请参阅:

RichGroupReduceFunction, GroupReduceOperator, DataSet

combineGroup

public <R> GroupCombineOperator<T,R> combineGroup(org.apache.flink.api.common.functions.GroupCombineFunction<T,R> combiner)

已过时。

Applies a GroupCombineFunction on a grouped DataSet. A CombineFunction is similar to a GroupReduceFunction but does not perform a full data exchange. Instead, the CombineFunction calls the combine method once per partition for combining a group of results. This operator is suitable for combining values into an intermediate format before doing a proper groupReduce where the data is shuffled across the node for further reduction. The GroupReduce operator can also be supplied with a combiner by implementing the RichGroupReduce function. The combine method of the RichGroupReduce function demands input and output type to be the same. The CombineFunction, on the other side, can have an arbitrary output type.

参数:

combiner - The GroupCombineFunction that is applied on the DataSet.

返回:

A GroupCombineOperator which represents the combined DataSet.

first

public GroupReduceOperator<T,T> first(int n)

已过时。

Returns a new set containing the first n elements in this grouped and sorted DataSet.

参数:

n - The desired number of elements for each group.

返回:

A GroupReduceOperator that represents the DataSet containing the elements.

sortGroup

public SortedGrouping<T> sortGroup(int field,
                                   org.apache.flink.api.common.operators.Order order)

已过时。

Sorts Tuple elements within a group on the specified field in the specified Order.

Note: Only groups of Tuple or Pojo elements can be sorted.

Groups can be sorted by multiple fields by chaining sortGroup(int, Order) calls.

参数:

field - The Tuple field on which the group is sorted.

order - The Order in which the specified Tuple field is sorted.

返回:

A SortedGrouping with specified order of group element.

另请参阅:

Tuple, Order

sortGroup

public SortedGrouping<T> sortGroup(String field,
                                   org.apache.flink.api.common.operators.Order order)

已过时。

Sorts Tuple or POJO elements within a group on the specified field in the specified Order.

Note: Only groups of Tuple or Pojo elements can be sorted.

Groups can be sorted by multiple fields by chaining sortGroup(String, Order) calls.

参数:

field - The Tuple or Pojo field on which the group is sorted.

order - The Order in which the specified field is sorted.

返回:

A SortedGrouping with specified order of group element.

另请参阅:

Tuple, Order