Package org.apache.flink.table.runtime.operators.rank

Class AppendOnlyFirstNFunction

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.streaming.api.functions.KeyedProcessFunction<org.apache.flink.table.data.RowData,org.apache.flink.table.data.RowData,org.apache.flink.table.data.RowData>

org.apache.flink.table.runtime.operators.rank.AbstractTopNFunction

org.apache.flink.table.runtime.operators.rank.AppendOnlyFirstNFunction

All Implemented Interfaces:

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

public class AppendOnlyFirstNFunction
extends AbstractTopNFunction

A variant of AppendOnlyTopNFunction to handle first-n case.

The input stream should only contain INSERT messages.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.streaming.api.functions.KeyedProcessFunction

org.apache.flink.streaming.api.functions.KeyedProcessFunction.Context, org.apache.flink.streaming.api.functions.KeyedProcessFunction.OnTimerContext

Field Summary

Fields inherited from class org.apache.flink.table.runtime.operators.rank.AbstractTopNFunction

hitCount, inputRowType, keyContext, outputRankNumber, rankEnd, requestCount, sortKeyComparator, sortKeySelector, ttlConfig

Constructor Summary

Constructors

Constructor	Description
AppendOnlyFirstNFunction(org.apache.flink.api.common.state.StateTtlConfig ttlConfig, InternalTypeInfo<org.apache.flink.table.data.RowData> inputRowType, GeneratedRecordComparator sortKeyGeneratedRecordComparator, RowDataKeySelector sortKeySelector, RankType rankType, RankRange rankRange, boolean generateUpdateBefore, boolean outputRankNumber)

Method Summary

Modifier and Type	Method	Description
void	open(org.apache.flink.api.common.functions.OpenContext openContext)
void	processElement(org.apache.flink.table.data.RowData input, org.apache.flink.streaming.api.functions.KeyedProcessFunction.Context context, org.apache.flink.util.Collector<org.apache.flink.table.data.RowData> out)

Methods inherited from class org.apache.flink.table.runtime.operators.rank.AbstractTopNFunction

checkSortKeyInBufferRange, collectDelete, collectDelete, collectInsert, collectInsert, collectUpdateAfter, collectUpdateAfter, collectUpdateBefore, collectUpdateBefore, getDefaultTopNSize, hasOffset, initRankEnd, isInRankEnd, isInRankRange, registerMetric, setKeyContext

Methods inherited from class org.apache.flink.streaming.api.functions.KeyedProcessFunction

onTimer

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Detail

AppendOnlyFirstNFunction

public AppendOnlyFirstNFunction(org.apache.flink.api.common.state.StateTtlConfig ttlConfig,
                                InternalTypeInfo<org.apache.flink.table.data.RowData> inputRowType,
                                GeneratedRecordComparator sortKeyGeneratedRecordComparator,
                                RowDataKeySelector sortKeySelector,
                                RankType rankType,
                                RankRange rankRange,
                                boolean generateUpdateBefore,
                                boolean outputRankNumber)

Method Detail

open

public void open(org.apache.flink.api.common.functions.OpenContext openContext)
          throws Exception

Specified by:

open in interface org.apache.flink.api.common.functions.RichFunction

Overrides:

open in class AbstractTopNFunction

Throws:

Exception

processElement

public void processElement(org.apache.flink.table.data.RowData input,
                           org.apache.flink.streaming.api.functions.KeyedProcessFunction.Context context,
                           org.apache.flink.util.Collector<org.apache.flink.table.data.RowData> out)
                    throws Exception

Specified by:

processElement in class org.apache.flink.streaming.api.functions.KeyedProcessFunction<org.apache.flink.table.data.RowData,org.apache.flink.table.data.RowData,org.apache.flink.table.data.RowData>

Throws:

Exception