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

Class 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>

All Implemented Interfaces:

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

Direct Known Subclasses:

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

Enclosing class:

BatchApproxCountDistinctAggFunctions

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

Base function for APPROX_COUNT_DISTINCT aggregate.

See Also:

• Serialized Form

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
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)

Methods inherited from class org.apache.flink.table.runtime.functions.aggregate.BuiltInAggregateFunction

getRequirements, getTypeInference, isDeterministic

Methods inherited from class org.apache.flink.table.functions.AggregateFunction

getKind

Methods inherited from class org.apache.flink.table.functions.ImperativeAggregateFunction

getAccumulatorType, getResultType

Methods inherited from class org.apache.flink.table.functions.UserDefinedFunction

close, functionIdentifier, open, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.table.functions.FunctionDefinition

supportsConstantFolding

Constructor Details

ApproxCountDistinctAggFunction

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

Method Details

createAccumulator

public HllBuffer createAccumulator()

Specified by:

createAccumulator in class org.apache.flink.table.functions.ImperativeAggregateFunction<Long,HllBuffer>

accumulate

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

Throws:

Exception

merge

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

Throws:

Exception

resetAccumulator

public void resetAccumulator(HllBuffer buffer)

getValue

public Long getValue(HllBuffer buffer)

Specified by:

getValue in class org.apache.flink.table.functions.AggregateFunction<Long,HllBuffer>

getArgumentDataTypes

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

Overrides:

getArgumentDataTypes in class BuiltInAggregateFunction<Long,HllBuffer>

getAccumulatorDataType

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

Overrides:

getAccumulatorDataType in class BuiltInAggregateFunction<Long,HllBuffer>

getOutputDataType

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

Overrides:

getOutputDataType in class BuiltInAggregateFunction<Long,HllBuffer>