spaces-X commented on a change in pull request #8234: URL: https://github.com/apache/incubator-doris/pull/8234#discussion_r814433675
########## File path: be/src/util/quantile_state.cpp ########## @@ -0,0 +1,377 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. +#include <string.h> +#include <cmath> +#include "util/quantile_state.h" +#include "util/coding.h" +#include "common/logging.h" + + +namespace doris{ + +template<typename T> +QuantileState<T>::QuantileState():_type(EMPTY),compression(2048){} + +template<typename T> +QuantileState<T>::QuantileState(float compression):_type(EMPTY),compression(compression){} + + +template<typename T> +QuantileState<T>::QuantileState(const Slice& slice) { + if (!deserialize(slice)) { + _type = EMPTY; + } +} + +template<typename T> +QuantileState<T>::~QuantileState() { + clear(); +} + +template<typename T> +size_t QuantileState<T>::get_serialized_size() { + size_t size = 1 + sizeof(float); // type(QuantileStateType) + compression(float) + switch(_type) { + case EMPTY: + break; + case SINGLE: + size += sizeof(T); + break; + case EXPLICIT: + size += sizeof(uint16_t) + sizeof(T) * _explicit_data.size(); + break; + case TDIGEST: + size += tdigest_ptr->serialized_size(); + break; + } + return size; +} + +template<typename T> +void QuantileState<T>::set_compression(float compression) { + this->compression = compression; +} + +template<typename T> +bool QuantileState<T>::is_valid(const Slice& slice) { + + if (slice.size < 1) { + return false; + } + const uint8_t* ptr = (uint8_t*)slice.data; + const uint8_t* end = (uint8_t*)slice.data + slice.size; + float compress_value = *reinterpret_cast<const float*>(ptr); + if (compress_value < 2048 || compress_value > 10000) { + return false; + } + ptr += sizeof(float); + + + auto type = (QuantileStateType)*ptr++; + switch (type) { + case EMPTY: + break; + case SINGLE:{ + if ((ptr + sizeof(T)) > end) { + return false; + } + ptr += sizeof(T); + // _single_data = *reinterpret_cast<T*>(ptr)++; + break; + } + case EXPLICIT: { + if ((ptr + sizeof(uint16_t)) > end) { + return false; + } + uint16_t num_explicits = decode_fixed16_le(ptr); + ptr += sizeof(uint16_t); + ptr += num_explicits * sizeof(T); + break; + } + case TDIGEST: { + if ((ptr + sizeof(uint32_t)) > end) { + return false; + } + uint32_t tdigest_serialized_length = decode_fixed32_le(ptr); + ptr += tdigest_serialized_length; + break; + } + default: + return false; + } + return ptr == end; +} + +template<typename T> +T QuantileState<T>::get_explicit_value_by_percentile(float percentile) { + DCHECK(_type == EXPLICIT); + if (percentile < 0 || percentile > 1) { + LOG(WARNING) << "get_explicit_value_by_percentile failed caused by percentile:" << percentile <<" is invalid"; + return NAN; + } + int n = _explicit_data.size(); + std::sort(_explicit_data.begin(), _explicit_data.end()); + + double index = (n - 1) * percentile; + int intIdx = (int) index; + if (intIdx == n-1 ){ + return _explicit_data[intIdx]; + } + return _explicit_data[intIdx+1] * (index - intIdx) + _explicit_data[intIdx] * (intIdx + 1 - index); +} + +template<typename T> +T QuantileState<T>::get_value_by_percentile(float percentile) { + switch(_type) { + case EMPTY: { + return NAN; + } + case SINGLE: { + return _single_data; + } + case EXPLICIT: { + return get_explicit_value_by_percentile(percentile); + } + case TDIGEST: { + return tdigest_ptr->quantile(percentile); + } + default: + break; + } + return NAN; +} + +template<typename T> +bool QuantileState<T>::deserialize(const Slice& slice) { + DCHECK(_type == EMPTY); + + // in case of insert error data caused be crashed + if (slice.data == nullptr || slice.size <= 0) { + return false; + } + // check input is valid + if (!is_valid(slice)) { + LOG(WARNING) << "QuantileState deserialize failed: slice is invalid"; + return false; + } + + const uint8_t* ptr = (uint8_t*)slice.data; + compression = *reinterpret_cast<const float*>(ptr); + ptr += sizeof(float); + // first byte : type + _type = (QuantileStateType)*ptr++; + switch (_type) { + case EMPTY: + // 1: empty + break; + case SINGLE: { + // 2: single_data value + _single_data = *reinterpret_cast<const T*>(ptr); + ptr += sizeof(T); + break; + } + case EXPLICIT: { + // 3: number of explicit values + // make sure that num_explicit is positive + uint16_t num_explicits = decode_fixed16_le(ptr); + ptr += sizeof(uint16_t); + _explicit_data.reserve(std::min(num_explicits*2, QUANTILE_STATE_EXPLICIT_NUM)); + _explicit_data.resize(num_explicits); + memcpy(&_explicit_data[0], ptr, num_explicits*sizeof(T)); + ptr += num_explicits*sizeof(T); + break; + } + case TDIGEST: { + // 4: Tdigest object value + tdigest_ptr = new TDigest(0); + tdigest_ptr->unserialize(ptr); + break; + } + default: + // revert type to EMPTY + _type = EMPTY; + return false; + } + return true; + +} + +template<typename T> +size_t QuantileState<T>::serialize(uint8_t* dst) const{ + uint8_t* ptr = dst; + *reinterpret_cast<float *>(ptr) = compression; + ptr += sizeof(float); + switch (_type) { + case EMPTY: { + *ptr++ = EMPTY; + break; + } + case SINGLE: { + *ptr++ = SINGLE; + *reinterpret_cast<T *>(ptr) = _single_data; + ptr += sizeof(T); + break; + } + case EXPLICIT: { + *ptr++ = EXPLICIT; + uint16_t size = _explicit_data.size(); + *reinterpret_cast<uint16_t *>(ptr) = size; + ptr += sizeof(uint16_t); + memcpy(ptr, &_explicit_data[0], size*sizeof(T)); + ptr += size*sizeof(T); + break; + } + case TDIGEST: { + *ptr++ = TDIGEST; + size_t tdigest_size = tdigest_ptr->serialize(ptr); + ptr += tdigest_size; + break; + } + default: + break; + } + return ptr - dst; +} + +template<typename T> +void QuantileState<T>::merge(QuantileState<T>& other) { + switch(other._type) { + case EMPTY: + break; + case SINGLE: { + add_value(other._single_data); + break; + } + case EXPLICIT: { + switch(_type) { + case EMPTY: + _type = EXPLICIT; + _explicit_data.swap(other._explicit_data); + break; + case SINGLE: + _type = EXPLICIT; + _explicit_data.swap(other._explicit_data); + add_value(_single_data); + break; + case EXPLICIT: + if (_explicit_data.size() + other._explicit_data.size() > QUANTILE_STATE_EXPLICIT_NUM) { + _type = TDIGEST; + tdigest_ptr = new TDigest(compression); Review comment: use `new TDigest(compression,compression,compression)` will save lots of memory. -- This is an automated message from the Apache Git Service. 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