org.apache.flink.table.runtime.functions.aggregate

类 BatchApproxCountDistinctAggFunctions.ApproxCountDistinctAggFunction<T>

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

org.apache.flink.table.functions.ImperativeAggregateFunction<T,ACC>

org.apache.flink.table.functions.AggregateFunction<T,ACC>

org.apache.flink.table.runtime.functions.aggregate.BuiltInAggregateFunction<Long,HllBuffer>

org.apache.flink.table.runtime.functions.aggregate.BatchApproxCountDistinctAggFunctions.ApproxCountDistinctAggFunction<T>

所有已实现的接口:

Serializable, org.apache.flink.table.functions.FunctionDefinition

直接已知子类:

BatchApproxCountDistinctAggFunctions.ByteApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.DateApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.DecimalApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.DoubleApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.FloatApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.IntApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.LongApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.ShortApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.StringApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.TimeApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.TimestampApproxCountDistinctAggFunction, BatchApproxCountDistinctAggFunctions.TimestampLtzApproxCountDistinctAggFunction

封闭类:

BatchApproxCountDistinctAggFunctions

public abstract static class BatchApproxCountDistinctAggFunctions.ApproxCountDistinctAggFunction<T>
extends BuiltInAggregateFunction<Long,HllBuffer>

Base function for APPROX_COUNT_DISTINCT aggregate.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
ApproxCountDistinctAggFunction(org.apache.flink.table.types.logical.LogicalType valueType)

方法概要

限定符和类型	方法和说明
void	accumulate(HllBuffer buffer, Object input)
HllBuffer	createAccumulator()
org.apache.flink.table.types.DataType	getAccumulatorDataType()
List<org.apache.flink.table.types.DataType>	getArgumentDataTypes()
org.apache.flink.table.types.DataType	getOutputDataType()
Long	getValue(HllBuffer buffer)
void	merge(HllBuffer buffer, Iterable<HllBuffer> it)
void	resetAccumulator(HllBuffer buffer)

从类继承的方法 org.apache.flink.table.runtime.functions.aggregate.BuiltInAggregateFunction

getRequirements, getTypeInference, isDeterministic

从类继承的方法 org.apache.flink.table.functions.AggregateFunction

getKind

从类继承的方法 org.apache.flink.table.functions.ImperativeAggregateFunction

getAccumulatorType, getResultType

从类继承的方法 org.apache.flink.table.functions.UserDefinedFunction

close, functionIdentifier, open, toString

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.table.functions.FunctionDefinition

supportsConstantFolding

构造器详细资料

ApproxCountDistinctAggFunction

public ApproxCountDistinctAggFunction(org.apache.flink.table.types.logical.LogicalType valueType)

方法详细资料

createAccumulator

public HllBuffer createAccumulator()

指定者:

createAccumulator 在类中 org.apache.flink.table.functions.ImperativeAggregateFunction<Long,HllBuffer>

accumulate

public void accumulate(HllBuffer buffer,
                       Object input)
                throws Exception

抛出:

Exception

merge

public void merge(HllBuffer buffer,
                  Iterable<HllBuffer> it)
           throws Exception

抛出:

Exception

resetAccumulator

public void resetAccumulator(HllBuffer buffer)

getValue

public Long getValue(HllBuffer buffer)

指定者:

getValue 在类中 org.apache.flink.table.functions.AggregateFunction<Long,HllBuffer>

getArgumentDataTypes

public List<org.apache.flink.table.types.DataType> getArgumentDataTypes()

覆盖:

getArgumentDataTypes 在类中 BuiltInAggregateFunction<Long,HllBuffer>

getAccumulatorDataType

public org.apache.flink.table.types.DataType getAccumulatorDataType()

覆盖:

getAccumulatorDataType 在类中 BuiltInAggregateFunction<Long,HllBuffer>

getOutputDataType

public org.apache.flink.table.types.DataType getOutputDataType()

覆盖:

getOutputDataType 在类中 BuiltInAggregateFunction<Long,HllBuffer>