Examples with HistogramStateFactory com.facebook.presto.operator.aggregation.state.HistogramStateFactory used on opensource projects

Example 1 with HistogramStateFactory

use of com.facebook.presto.operator.aggregation.state.HistogramStateFactory in project presto by prestodb.

the class Histogram method generateAggregation.

private static InternalAggregationFunction generateAggregation(Type keyType, Type valueType) {
    DynamicClassLoader classLoader = new DynamicClassLoader(Histogram.class.getClassLoader());
    List<Type> inputTypes = ImmutableList.of(keyType);
    Type outputType = new MapType(keyType, valueType);
    HistogramStateSerializer stateSerializer = new HistogramStateSerializer(keyType);
    Type intermediateType = stateSerializer.getSerializedType();
    MethodHandle inputFunction = INPUT_FUNCTION.bindTo(keyType);
    MethodHandle outputFunction = OUTPUT_FUNCTION.bindTo(outputType);
    AggregationMetadata metadata = new AggregationMetadata(generateAggregationName(NAME, outputType.getTypeSignature(), inputTypes.stream().map(Type::getTypeSignature).collect(toImmutableList())), createInputParameterMetadata(keyType), inputFunction, COMBINE_FUNCTION, outputFunction, HistogramState.class, stateSerializer, new HistogramStateFactory(), outputType);
    GenericAccumulatorFactoryBinder factory = AccumulatorCompiler.generateAccumulatorFactoryBinder(metadata, classLoader);
    return new InternalAggregationFunction(NAME, inputTypes, intermediateType, outputType, true, factory);
}