be/src/exprs/hybrid_set.h

Source
// Licensed to the Apache Software Foundation (ASF) under one
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// 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.

#pragma once

#include <gen_cpp/internal_service.pb.h>
#include <pdqsort.h>

#include "common/object_pool.h"
#include "core/column/column_nullable.h"
#include "core/column/column_string.h"
#include "core/column/column_vector.h"
#include "core/data_type/primitive_type.h"
#include "exec/common/hash_table/phmap_fwd_decl.h"
#include "exec/runtime_filter/utils.h"
#include "exprs/filter_base.h"

namespace doris {
constexpr int FIXED_CONTAINER_MAX_SIZE = 8;

/**
 * Fix Container can use simd to improve performance. 1 <= N <= 8 can be improved performance by test. FIXED_CONTAINER_MAX_SIZE = 8.
 * @tparam T Element Type
 * @tparam N Fixed Number
 */
template <typename T, size_t N>
class FixedContainer {
public:
    using Self = FixedContainer;
    using ElementType = T;

    class Iterator;

    FixedContainer() { static_assert(N >= 0 && N <= FIXED_CONTAINER_MAX_SIZE); }

    ~FixedContainer() = default;

    void insert(const T& value) {
        DCHECK(_size < N);
        _data[_size++] = value;
    }

    void insert(Iterator begin, Iterator end) {
        for (auto iter = begin; iter != end; ++iter) {
            DCHECK(_size < N);
            _data[_size++] = (*iter);
        }
    }

    void check_size() {
        if (N != _size) {
            throw doris::Exception(ErrorCode::INTERNAL_ERROR,
                                   "invalid size of FixedContainer<{}>: {}", N, _size);
        }
    }

    // Use '|' instead of '||' has better performance by test.
    ALWAYS_INLINE bool find(const T& value) const {
        DCHECK_EQ(N, _size);
        return _find_impl(value, std::make_index_sequence<N> {});
    }

private:
    template <size_t... I>
    ALWAYS_INLINE bool _find_impl(const T& value, std::index_sequence<I...>) const {
        if constexpr (sizeof...(I) == 0) {
            return false;
        } else {
            return (... | (uint8_t)(Compare::equal(value, _data[I])));
        }
    }

public:
    size_t size() const { return _size; }

    class Iterator {
    public:
        explicit Iterator(std::array<T, N>& data, size_t index) : _data(data), _index(index) {}
        Iterator& operator++() {
            ++_index;
            return *this;
        }
        Iterator operator++(int) {
            Iterator ret_val = *this;
            ++(*this);
            return ret_val;
        }
        bool operator==(Iterator other) const { return _index == other._index; }
        bool operator!=(Iterator other) const { return !(*this == other); }
        T& operator*() const { return _data[_index]; }

        T* operator->() const { return &operator*(); }

        // iterator traits
        using iterator_category = std::forward_iterator_tag;
        using difference_type = std::ptrdiff_t;
        using value_type = T;
        using pointer = T*;
        using reference = T&;

    private:
        std::array<T, N>& _data;
        size_t _index;
    };
    Iterator begin() { return Iterator(_data, 0); }
    Iterator end() { return Iterator(_data, _size); }

    void clear() {
        std::array<T, N> {}.swap(_data);
        _size = 0;
    }

private:
    std::array<T, N> _data;
    size_t _size {};
};

template <typename T>
struct IsFixedContainer : std::false_type {};

template <typename T, size_t N>
struct IsFixedContainer<FixedContainer<T, N>> : std::true_type {};

/**
 * Dynamic Container uses phmap::flat_hash_set.
 * @tparam T Element Type
 */
template <typename T>
class DynamicContainer {
public:
    using Self = DynamicContainer;
    using Iterator = typename flat_hash_set<T>::iterator;
    using ElementType = T;

    DynamicContainer() = default;
    ~DynamicContainer() = default;

    void insert(const T& value) { _set.insert(value); }

    void insert(Iterator begin, Iterator end) { _set.insert(begin, end); }

    bool find(const T& value) const { return _set.contains(value); }

    void clear() { _set.clear(); }

    Iterator begin() { return _set.begin(); }

    Iterator end() { return _set.end(); }

    size_t size() const { return _set.size(); }

private:
    flat_hash_set<T> _set;
};

// TODO Maybe change void* parameter to template parameter better.
class HybridSetBase : public FilterBase {
public:
    HybridSetBase(bool null_aware) : FilterBase(null_aware) {}
    virtual ~HybridSetBase() = default;
    virtual void insert(const void* data) = 0;
    // use in vectorize execute engine
    virtual void insert(void* data, size_t) = 0;

    virtual void insert_range_from(const ColumnPtr& column, size_t start, size_t end) = 0;

    virtual void insert_fixed_len(const ColumnPtr& column, size_t start) = 0;

    virtual void insert(HybridSetBase* set) {
        HybridSetBase::IteratorBase* iter = set->begin();
        while (iter->has_next()) {
            const void* value = iter->get_value();
            insert(value);
            iter->next();
        }
        _contain_null |= set->_contain_null;
    }

    virtual void clear() = 0;
    bool empty() { return !_contain_null && size() == 0; }
    virtual int size() = 0;
    virtual bool find(const void* data) const = 0;
    // use in vectorize execute engine
    virtual bool find(const void* data, size_t) const = 0;

    virtual void find_batch(const doris::IColumn& column, size_t rows,
                            doris::ColumnUInt8::Container& results,
                            const uint8_t* __restrict filter = nullptr) = 0;
    virtual void find_batch_negative(const doris::IColumn& column, size_t rows,
                                     doris::ColumnUInt8::Container& results,
                                     const uint8_t* __restrict filter = nullptr) = 0;
    virtual void find_batch_nullable(const doris::IColumn& column, size_t rows,
                                     const doris::NullMap& null_map,
                                     doris::ColumnUInt8::Container& results,
                                     const uint8_t* __restrict filter = nullptr) = 0;
    virtual void find_batch_nullable_negative(const doris::IColumn& column, size_t rows,
                                              const doris::NullMap& null_map,
                                              doris::ColumnUInt8::Container& results,
                                              const uint8_t* __restrict filter = nullptr) = 0;

    virtual void to_pb(PInFilter* filter) = 0;
    virtual uint64_t get_digest(uint64_t seed) = 0;

    class IteratorBase {
    public:
        IteratorBase() = default;
        virtual ~IteratorBase() = default;
        virtual const void* get_value() = 0;
        virtual bool has_next() const = 0;
        virtual void next() = 0;
    };

    virtual IteratorBase* begin() = 0;
};

template <PrimitiveType T,
          typename _ContainerType = DynamicContainer<typename PrimitiveTypeTraits<T>::CppType>,
          typename _ColumnType = typename PrimitiveTypeTraits<T>::ColumnType>
class HybridSet : public HybridSetBase {
public:
    using ContainerType = _ContainerType;
    using ElementType = typename ContainerType::ElementType;
    using ColumnType = _ColumnType;

    HybridSet(bool null_aware) : HybridSetBase(null_aware) {}
    ~HybridSet() override = default;

    void insert(const void* data) override {
        if (data == nullptr) {
            _contain_null = true;
            return;
        }
        _set.insert(*reinterpret_cast<const ElementType*>(data));
    }
    void clear() override { _set.clear(); }

    void insert(void* data, size_t /*unused*/) override { insert(data); }

    void insert_fixed_len(const ColumnPtr& column, size_t start) override {
        insert_range_from(column, start, column->size());
    }

    void insert_range_from(const ColumnPtr& column, size_t start, size_t end) override {
        if (end > column->size()) {
            throw doris::Exception(doris::ErrorCode::INTERNAL_ERROR,
                                   "Parameters start = {}, end = {}, are out of bound in "
                                   "HybridSet::insert_range_from method (data.size() = {}).",
                                   start, end, column->size());
        }
        if (column->is_nullable()) {
            const auto* nullable = assert_cast<const ColumnNullable*>(column.get());
            const auto& col = nullable->get_nested_column();
            const auto& nullmap =
                    assert_cast<const ColumnUInt8&>(nullable->get_null_map_column()).get_data();

            const ElementType* data = (ElementType*)col.get_raw_data().data;
            for (size_t i = start; i < end; i++) {
                if (!nullmap[i]) {
                    _set.insert(*(data + i));
                } else {
                    _contain_null = true;
                }
            }
        } else {
            const ElementType* data = (ElementType*)column->get_raw_data().data;
            for (size_t i = start; i < end; i++) {
                _set.insert(*(data + i));
            }
        }
    }

    int size() override { return (int)_set.size(); }

    bool find(const void* data) const override {
        return _set.find(*reinterpret_cast<const ElementType*>(data));
    }

    bool find(const void* data, size_t /*unused*/) const override { return find(data); }

    void find_batch(const doris::IColumn& column, size_t rows,
                    doris::ColumnUInt8::Container& results,
                    const uint8_t* __restrict filter = nullptr) override {
        _find_batch<false, false>(column, rows, nullptr, results, filter);
    }

    void find_batch_negative(const doris::IColumn& column, size_t rows,
                             doris::ColumnUInt8::Container& results,
                             const uint8_t* __restrict filter = nullptr) override {
        _find_batch<false, true>(column, rows, nullptr, results, filter);
    }

    void find_batch_nullable(const doris::IColumn& column, size_t rows,
                             const doris::NullMap& null_map, doris::ColumnUInt8::Container& results,
                             const uint8_t* __restrict filter = nullptr) override {
        _find_batch<true, false>(column, rows, &null_map, results, filter);
    }

    void find_batch_nullable_negative(const doris::IColumn& column, size_t rows,
                                      const doris::NullMap& null_map,
                                      doris::ColumnUInt8::Container& results,
                                      const uint8_t* __restrict filter = nullptr) override {
        _find_batch<true, true>(column, rows, &null_map, results, filter);
    }

    template <bool is_nullable, bool is_negative>
    void _find_batch(const doris::IColumn& column, size_t rows, const doris::NullMap* null_map,
                     doris::ColumnUInt8::Container& results, const uint8_t* __restrict filter) {
        auto& col = assert_cast<const ColumnType&>(column);
        const auto* __restrict data = (ElementType*)col.get_data().data();
        const uint8_t* __restrict null_map_data;
        if constexpr (is_nullable) {
            null_map_data = null_map->data();
        }

        if constexpr (IsFixedContainer<ContainerType>::value) {
            _set.check_size();
        }

        auto* __restrict result_data = results.data();

        auto update_value = [&](size_t i) {
            if constexpr (!is_nullable && !is_negative) {
                result_data[i] = _set.find(data[i]);
            } else if constexpr (!is_nullable && is_negative) {
                result_data[i] = !_set.find(data[i]);
            } else if constexpr (is_nullable && !is_negative) {
                result_data[i] = _set.find(data[i]) & (!null_map_data[i]);
            } else { // (is_nullable && is_negative)
                result_data[i] = !(_set.find(data[i]) & (!null_map_data[i]));
            }
        };
        if (filter != nullptr) {
            for (size_t i = 0; i < rows; i++) {
                if (filter[i]) {
                    update_value(i);
                }
            }
        } else {
            for (size_t i = 0; i < rows; i++) {
                update_value(i);
            }
        }
    }

    class Iterator : public IteratorBase {
    public:
        Iterator(typename ContainerType::Iterator begin, typename ContainerType::Iterator end)
                : _begin(begin), _end(end) {}
        ~Iterator() override = default;
        bool has_next() const override { return !(_begin == _end); }
        const void* get_value() override { return _begin.operator->(); }
        void next() override { ++_begin; }

    private:
        typename ContainerType::Iterator _begin;
        typename ContainerType::Iterator _end;
    };

    IteratorBase* begin() override {
        return _pool.add(new (std::nothrow) Iterator(_set.begin(), _set.end()));
    }

    void set_pb(PInFilter* filter, auto f) {
        for (auto v : _set) {
            f(filter->add_values(), v);
        }
    }

    void to_pb(PInFilter* filter) override { set_pb(filter, get_convertor<ElementType>()); }

    uint64_t get_digest(uint64_t seed) override {
        std::vector<ElementType> elems(_set.begin(), _set.end());
        pdqsort(elems.begin(), elems.end());
        if constexpr (std::is_same<ElementType, bool>::value) {
            for (bool v : elems) {
                seed = HashUtil::crc_hash64(&v, sizeof(v), seed);
            }
        } else {
            seed = HashUtil::crc_hash64(elems.data(),
                                        (uint32_t)(elems.size() * sizeof(ElementType)), seed);
        }

        return HashUtil::crc_hash64(&_contain_null, sizeof(_contain_null), seed);
    }

private:
    ContainerType _set;
    ObjectPool _pool;
};

template <typename _ContainerType = DynamicContainer<std::string>>
class StringSet : public HybridSetBase {
public:
    using ContainerType = _ContainerType;

    StringSet(bool null_aware) : HybridSetBase(null_aware) {}

    ~StringSet() override = default;

    void clear() override { _set.clear(); }
    void insert(const void* data) override {
        if (data == nullptr) {
            _contain_null = true;
            return;
        }

        const auto* value = reinterpret_cast<const StringRef*>(data);
        std::string str_value(value->data, value->size);
        _set.insert(str_value);
    }

    void insert(void* data, size_t size) override {
        if (data == nullptr) {
            insert(nullptr);
        } else {
            std::string str_value(reinterpret_cast<char*>(data), size);
            _set.insert(str_value);
        }
    }

    void _insert_fixed_len_string(const auto& col, const uint8_t* __restrict nullmap, size_t start,
                                  size_t end) {
        for (size_t i = start; i < end; i++) {
            if (nullmap == nullptr || !nullmap[i]) {
                _set.insert(col.get_data_at(i).to_string());
            } else {
                _contain_null = true;
            }
        }
    }

    void insert_fixed_len(const ColumnPtr& column, size_t start) override {
        insert_range_from(column, start, column->size());
    }

    void insert_range_from(const ColumnPtr& column, size_t start, size_t end) override {
        if (end > column->size()) {
            throw doris::Exception(doris::ErrorCode::INTERNAL_ERROR,
                                   "Parameters start = {}, end = {}, are out of bound in "
                                   "StringSet::insert_range_from method (data.size() = {}).",
                                   start, end, column->size());
        }
        if (column->is_nullable()) {
            const auto* nullable = assert_cast<const ColumnNullable*>(column.get());
            const auto& nullmap =
                    assert_cast<const ColumnUInt8&>(nullable->get_null_map_column()).get_data();
            if (nullable->get_nested_column().is_column_string64()) {
                _insert_fixed_len_string(
                        assert_cast<const ColumnString64&>(nullable->get_nested_column()),
                        nullmap.data(), start, end);
            } else {
                _insert_fixed_len_string(
                        assert_cast<const ColumnString&>(nullable->get_nested_column()),
                        nullmap.data(), start, end);
            }
        } else {
            if (column->is_column_string64()) {
                _insert_fixed_len_string(assert_cast<const ColumnString64&>(*column), nullptr,
                                         start, end);
            } else {
                _insert_fixed_len_string(assert_cast<const ColumnString&>(*column), nullptr, start,
                                         end);
            }
        }
    }

    int size() override { return (int)_set.size(); }

    bool find(const void* data) const override {
        const auto* value = reinterpret_cast<const StringRef*>(data);
        std::string str_value(value->data, value->size);
        return _set.find(str_value);
    }

    bool find(const void* data, size_t size) const override {
        std::string str_value(reinterpret_cast<const char*>(data), size);
        return _set.find(str_value);
    }

    void find_batch(const doris::IColumn& column, size_t rows,
                    doris::ColumnUInt8::Container& results,
                    const uint8_t* __restrict filter = nullptr) override {
        _find_batch<false, false>(column, rows, nullptr, results, filter);
    }

    void find_batch_negative(const doris::IColumn& column, size_t rows,
                             doris::ColumnUInt8::Container& results,
                             const uint8_t* __restrict filter = nullptr) override {
        _find_batch<false, true>(column, rows, nullptr, results, filter);
    }

    void find_batch_nullable(const doris::IColumn& column, size_t rows,
                             const doris::NullMap& null_map, doris::ColumnUInt8::Container& results,
                             const uint8_t* __restrict filter = nullptr) override {
        _find_batch<true, false>(column, rows, &null_map, results, filter);
    }

    void find_batch_nullable_negative(const doris::IColumn& column, size_t rows,
                                      const doris::NullMap& null_map,
                                      doris::ColumnUInt8::Container& results,
                                      const uint8_t* __restrict filter = nullptr) override {
        _find_batch<true, true>(column, rows, &null_map, results, filter);
    }

    template <bool is_nullable, bool is_negative>
    void _find_batch(const doris::IColumn& column, size_t rows, const doris::NullMap* null_map,
                     doris::ColumnUInt8::Container& results, const uint8_t* __restrict filter) {
        const auto& col = assert_cast<const doris::ColumnString&>(column);
        const uint8_t* __restrict null_map_data;
        if constexpr (is_nullable) {
            null_map_data = null_map->data();
        }

        if constexpr (IsFixedContainer<ContainerType>::value) {
            _set.check_size();
        }

        auto* __restrict result_data = results.data();

        auto update_value = [&](size_t i) {
            const auto& string_data = col.get_data_at(i).to_string();
            if constexpr (!is_nullable && !is_negative) {
                result_data[i] = _set.find(string_data);
            } else if constexpr (!is_nullable && is_negative) {
                result_data[i] = !_set.find(string_data);
            } else if constexpr (is_nullable && !is_negative) {
                result_data[i] = _set.find(string_data) & (!null_map_data[i]);
            } else { // (is_nullable && is_negative)
                result_data[i] = !(_set.find(string_data) & (!null_map_data[i]));
            }
        };

        if (filter != nullptr) {
            for (size_t i = 0; i < rows; ++i) {
                if (filter[i]) {
                    update_value(i);
                }
            }
        } else {
            for (size_t i = 0; i < rows; ++i) {
                update_value(i);
            }
        }
    }

    class Iterator : public IteratorBase {
    public:
        Iterator(typename ContainerType::Iterator begin, typename ContainerType::Iterator end)
                : _begin(begin), _end(end) {}
        ~Iterator() override = default;
        bool has_next() const override { return !(_begin == _end); }
        const void* get_value() override {
            _value.data = _begin->data();
            _value.size = _begin->length();
            return &_value;
        }
        void next() override { ++_begin; }

    private:
        typename ContainerType::Iterator _begin;
        typename ContainerType::Iterator _end;
        StringRef _value;
    };

    IteratorBase* begin() override {
        return _pool.add(new (std::nothrow) Iterator(_set.begin(), _set.end()));
    }

    void set_pb(PInFilter* filter, auto f) {
        for (const auto& v : _set) {
            f(filter->add_values(), v);
        }
    }

    void to_pb(PInFilter* filter) override { set_pb(filter, get_convertor<std::string>()); }

    uint64_t get_digest(uint64_t seed) override {
        std::vector<StringRef> elems(_set.begin(), _set.end());
        pdqsort(elems.begin(), elems.end());

        for (const auto& v : elems) {
            seed = HashUtil::crc_hash64(v.data, (uint32_t)v.size, seed);
        }
        return HashUtil::crc_hash64(&_contain_null, sizeof(_contain_null), seed);
    }

private:
    ContainerType _set;
    ObjectPool _pool;
};

// note: Two difference from StringSet
// 1 StringRef has better comparison performance than std::string
// 2 std::string keeps its own memory, bug StringRef just keeps ptr and len, so you the caller should manage memory of StringRef
template <typename _ContainerType = DynamicContainer<StringRef>>
class StringValueSet : public HybridSetBase {
public:
    using ContainerType = _ContainerType;

    StringValueSet(bool null_aware) : HybridSetBase(null_aware) {}

    ~StringValueSet() override = default;
    void clear() override { _set.clear(); }

    void insert(const void* data) override {
        if (data == nullptr) {
            _contain_null = true;
            return;
        }

        const auto* value = reinterpret_cast<const StringRef*>(data);
        StringRef sv(value->data, value->size);
        _set.insert(sv);
    }

    void insert(void* data, size_t size) override {
        if (data == nullptr) {
            insert(nullptr);
        } else {
            StringRef sv(reinterpret_cast<char*>(data), size);
            _set.insert(sv);
        }
    }

    void _insert_fixed_len_string(const auto& col, const uint8_t* __restrict nullmap, size_t start,
                                  size_t end) {
        for (size_t i = start; i < end; i++) {
            if (nullmap == nullptr || !nullmap[i]) {
                _set.insert(col.get_data_at(i));
            } else {
                _contain_null = true;
            }
        }
    }

    void insert_fixed_len(const ColumnPtr& column, size_t start) override {
        insert_range_from(column, start, column->size());
    }

    void insert_range_from(const ColumnPtr& column, size_t start, size_t end) override {
        if (end > column->size()) {
            throw doris::Exception(doris::ErrorCode::INTERNAL_ERROR,
                                   "Parameters start = {}, end = {}, are out of bound in "
                                   "StringSet::insert_range_from method (data.size() = {}).",
                                   start, end, column->size());
        }
        if (column->is_nullable()) {
            const auto* nullable = assert_cast<const ColumnNullable*>(column.get());
            const auto& nullmap =
                    assert_cast<const ColumnUInt8&>(nullable->get_null_map_column()).get_data();
            if (nullable->get_nested_column().is_column_string64()) {
                _insert_fixed_len_string(
                        assert_cast<const ColumnString64&>(nullable->get_nested_column()),
                        nullmap.data(), start, end);
            } else {
                _insert_fixed_len_string(
                        assert_cast<const ColumnString&>(nullable->get_nested_column()),
                        nullmap.data(), start, end);
            }
        } else {
            if (column->is_column_string64()) {
                _insert_fixed_len_string(assert_cast<const ColumnString64&>(*column), nullptr,
                                         start, end);
            } else {
                _insert_fixed_len_string(assert_cast<const ColumnString&>(*column), nullptr, start,
                                         end);
            }
        }
    }

    int size() override { return (int)_set.size(); }

    bool find(const void* data) const override {
        const auto* value = reinterpret_cast<const StringRef*>(data);
        return _set.find(*value);
    }

    bool find(const void* data, size_t size) const override {
        StringRef sv(reinterpret_cast<const char*>(data), size);
        return _set.find(sv);
    }

    void find_batch(const doris::IColumn& column, size_t rows,
                    doris::ColumnUInt8::Container& results,
                    const uint8_t* __restrict filter) override {
        _find_batch<false, false>(column, rows, nullptr, results, filter);
    }

    void find_batch_negative(const doris::IColumn& column, size_t rows,
                             doris::ColumnUInt8::Container& results,
                             const uint8_t* __restrict filter) override {
        _find_batch<false, true>(column, rows, nullptr, results, filter);
    }

    void find_batch_nullable(const doris::IColumn& column, size_t rows,
                             const doris::NullMap& null_map, doris::ColumnUInt8::Container& results,
                             const uint8_t* __restrict filter) override {
        _find_batch<true, false>(column, rows, &null_map, results, filter);
    }

    void find_batch_nullable_negative(const doris::IColumn& column, size_t rows,
                                      const doris::NullMap& null_map,
                                      doris::ColumnUInt8::Container& results,
                                      const uint8_t* __restrict filter) override {
        _find_batch<true, true>(column, rows, &null_map, results, filter);
    }

    template <bool is_nullable, bool is_negative>
    void _find_batch(const doris::IColumn& column, size_t rows, const doris::NullMap* null_map,
                     doris::ColumnUInt8::Container& results, const uint8_t* __restrict filter) {
        const auto& col = assert_cast<const doris::ColumnString&>(column);
        const auto& offset = col.get_offsets();
        const uint8_t* __restrict data = col.get_chars().data();
        const uint8_t* __restrict null_map_data;
        if constexpr (is_nullable) {
            null_map_data = null_map->data();
        }

        if constexpr (IsFixedContainer<ContainerType>::value) {
            _set.check_size();
        }

        auto* __restrict result_data = results.data();

        auto update_value = [&](size_t i, uint32_t len) {
            if constexpr (!is_nullable && !is_negative) {
                result_data[i] = _set.find(StringRef(data, len));
            } else if constexpr (!is_nullable && is_negative) {
                result_data[i] = !_set.find(StringRef(data, len));
            } else if constexpr (is_nullable && !is_negative) {
                result_data[i] = (!null_map_data[i]) & _set.find(StringRef(data, len));
            } else { // (is_nullable && is_negative)
                result_data[i] = !((!null_map_data[i]) & _set.find(StringRef(data, len)));
            }
        };

        if (filter != nullptr) {
            for (size_t i = 0; i < rows; ++i) {
                uint32_t len = offset[i] - offset[i - 1];
                if (filter[i]) {
                    update_value(i, len);
                }
                data += len;
            }
        } else {
            for (size_t i = 0; i < rows; ++i) {
                uint32_t len = offset[i] - offset[i - 1];
                update_value(i, len);
                data += len;
            }
        }
    }

    class Iterator : public IteratorBase {
    public:
        Iterator(typename ContainerType::Iterator begin, typename ContainerType::Iterator end)
                : _begin(begin), _end(end) {}
        ~Iterator() override = default;
        bool has_next() const override { return !(_begin == _end); }
        const void* get_value() override {
            _value.data = _begin->data;
            _value.size = _begin->size;
            return &_value;
        }
        void next() override { ++_begin; }

    private:
        typename ContainerType::Iterator _begin;
        typename ContainerType::Iterator _end;
        StringRef _value;
    };

    IteratorBase* begin() override {
        return _pool.add(new (std::nothrow) Iterator(_set.begin(), _set.end()));
    }

    void to_pb(PInFilter* filter) override {
        throw Exception(ErrorCode::INTERNAL_ERROR, "StringValueSet do not support to_pb");
    }

    uint64_t get_digest(uint64_t seed) override {
        std::vector<StringRef> elems(_set.begin(), _set.end());
        pdqsort(elems.begin(), elems.end());

        for (const auto& v : elems) {
            seed = HashUtil::crc_hash64(v.data, (uint32_t)v.size, seed);
        }

        return HashUtil::crc_hash64(&_contain_null, sizeof(_contain_null), seed);
    }

private:
    ContainerType _set;
    ObjectPool _pool;
};
} // namespace doris

Coverage Report

Created: 2026-04-15 06:08