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308 lines
8.1 KiB
C++
308 lines
8.1 KiB
C++
#pragma once
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#include <string.h> // memcpy
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#include <DB/Common/PODArray.h>
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#include <DB/Common/Arena.h>
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#include <DB/Common/memcpySmall.h>
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#include <DB/Columns/IColumn.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/IO/WriteHelpers.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int TOO_LARGE_STRING_SIZE;
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extern const int SIZE_OF_FIXED_STRING_DOESNT_MATCH;
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extern const int SIZES_OF_COLUMNS_DOESNT_MATCH;
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extern const int PARAMETER_OUT_OF_BOUND;
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}
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/** Cтолбeц значений типа "строка фиксированной длины".
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* Если вставить строку меньшей длины, то она будет дополнена нулевыми байтами.
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*/
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class ColumnFixedString final : public IColumn
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{
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public:
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using Chars_t = PaddedPODArray<UInt8>;
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private:
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/// Байты строк, уложенные подряд. Строки хранятся без завершающего нулевого байта.
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/** NOTE Требуется, чтобы смещение и тип chars в объекте был таким же, как у data в ColumnUInt8.
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* Это используется в функции packFixed (AggregationCommon.h)
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*/
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Chars_t chars;
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/// Размер строк.
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const size_t n;
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public:
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/** Создать пустой столбец строк фиксированной длины n */
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ColumnFixedString(size_t n_) : n(n_) {}
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std::string getName() const override { return "ColumnFixedString"; }
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ColumnPtr cloneEmpty() const override
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{
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return std::make_shared<ColumnFixedString>(n);
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}
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size_t size() const override
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{
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return chars.size() / n;
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}
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size_t sizeOfField() const override
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{
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return n;
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}
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bool isFixed() const override
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{
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return true;
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}
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size_t byteSize() const override
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{
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return chars.size() + sizeof(n);
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}
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Field operator[](size_t index) const override
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{
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return String(reinterpret_cast<const char *>(&chars[n * index]), n);
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}
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void get(size_t index, Field & res) const override
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{
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res.assignString(reinterpret_cast<const char *>(&chars[n * index]), n);
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}
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StringRef getDataAt(size_t index) const override
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{
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return StringRef(&chars[n * index], n);
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}
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void insert(const Field & x) override
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{
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const String & s = DB::get<const String &>(x);
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if (s.size() > n)
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throw Exception("Too large string '" + s + "' for FixedString column", ErrorCodes::TOO_LARGE_STRING_SIZE);
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size_t old_size = chars.size();
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chars.resize_fill(old_size + n);
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memcpy(&chars[old_size], s.data(), s.size());
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}
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void insertFrom(const IColumn & src_, size_t index) override
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{
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const ColumnFixedString & src = static_cast<const ColumnFixedString &>(src_);
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if (n != src.getN())
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throw Exception("Size of FixedString doesn't match", ErrorCodes::SIZE_OF_FIXED_STRING_DOESNT_MATCH);
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size_t old_size = chars.size();
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chars.resize(old_size + n);
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memcpySmallAllowReadWriteOverflow15(&chars[old_size], &src.chars[n * index], n);
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}
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void insertData(const char * pos, size_t length) override
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{
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if (length > n)
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throw Exception("Too large string for FixedString column", ErrorCodes::TOO_LARGE_STRING_SIZE);
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size_t old_size = chars.size();
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chars.resize_fill(old_size + n);
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memcpy(&chars[old_size], pos, length);
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}
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void insertDefault() override
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{
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chars.resize_fill(chars.size() + n);
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}
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void popBack(size_t elems) override
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{
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chars.resize_assume_reserved(chars.size() - n * elems);
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}
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StringRef serializeValueIntoArena(size_t index, Arena & arena, char const *& begin) const override
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{
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auto pos = arena.allocContinue(n, begin);
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memcpy(pos, &chars[n * index], n);
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return StringRef(pos, n);
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}
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const char * deserializeAndInsertFromArena(const char * pos) override
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{
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size_t old_size = chars.size();
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chars.resize(old_size + n);
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memcpy(&chars[old_size], pos, n);
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return pos + n;
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}
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int compareAt(size_t p1, size_t p2, const IColumn & rhs_, int nan_direction_hint) const override
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{
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const ColumnFixedString & rhs = static_cast<const ColumnFixedString &>(rhs_);
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return memcmp(&chars[p1 * n], &rhs.chars[p2 * n], n);
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}
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template <bool positive>
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struct less
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{
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const ColumnFixedString & parent;
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less(const ColumnFixedString & parent_) : parent(parent_) {}
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bool operator()(size_t lhs, size_t rhs) const
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{
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/// TODO: memcmp тормозит.
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int res = memcmp(&parent.chars[lhs * parent.n], &parent.chars[rhs * parent.n], parent.n);
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return positive ? (res < 0) : (res > 0);
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}
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};
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void getPermutation(bool reverse, size_t limit, Permutation & res) const override
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{
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size_t s = size();
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res.resize(s);
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for (size_t i = 0; i < s; ++i)
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res[i] = i;
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if (limit >= s)
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limit = 0;
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if (limit)
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{
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if (reverse)
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std::partial_sort(res.begin(), res.begin() + limit, res.end(), less<false>(*this));
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else
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std::partial_sort(res.begin(), res.begin() + limit, res.end(), less<true>(*this));
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}
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else
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{
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if (reverse)
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std::sort(res.begin(), res.end(), less<false>(*this));
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else
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std::sort(res.begin(), res.end(), less<true>(*this));
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}
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}
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void insertRangeFrom(const IColumn & src, size_t start, size_t length) override
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{
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const ColumnFixedString & src_concrete = static_cast<const ColumnFixedString &>(src);
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if (start + length > src_concrete.size())
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throw Exception("Parameters start = "
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+ toString(start) + ", length = "
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+ toString(length) + " are out of bound in ColumnFixedString::insertRangeFrom method"
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" (size() = " + toString(src_concrete.size()) + ").",
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ErrorCodes::PARAMETER_OUT_OF_BOUND);
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size_t old_size = chars.size();
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chars.resize(old_size + length * n);
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memcpy(&chars[old_size], &src_concrete.chars[start * n], length * n);
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}
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ColumnPtr filter(const IColumn::Filter & filt, ssize_t result_size_hint) const override
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{
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size_t col_size = size();
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if (col_size != filt.size())
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throw Exception("Size of filter doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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std::shared_ptr<ColumnFixedString> res = std::make_shared<ColumnFixedString>(n);
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if (result_size_hint)
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res->chars.reserve(result_size_hint > 0 ? result_size_hint * n : chars.size());
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size_t offset = 0;
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for (size_t i = 0; i < col_size; ++i, offset += n)
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{
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if (filt[i])
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{
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res->chars.resize(res->chars.size() + n);
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memcpySmallAllowReadWriteOverflow15(&res->chars[res->chars.size() - n], &chars[offset], n);
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}
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}
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return res;
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}
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ColumnPtr permute(const Permutation & perm, size_t limit) const override
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{
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size_t col_size = size();
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if (limit == 0)
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limit = col_size;
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else
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limit = std::min(col_size, limit);
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if (perm.size() < limit)
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throw Exception("Size of permutation is less than required.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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if (limit == 0)
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return std::make_shared<ColumnFixedString>(n);
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std::shared_ptr<ColumnFixedString> res = std::make_shared<ColumnFixedString>(n);
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Chars_t & res_chars = res->chars;
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res_chars.resize(n * limit);
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size_t offset = 0;
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for (size_t i = 0; i < limit; ++i, offset += n)
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memcpySmallAllowReadWriteOverflow15(&res_chars[offset], &chars[perm[i] * n], n);
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return res;
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}
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ColumnPtr replicate(const Offsets_t & offsets) const override
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{
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size_t col_size = size();
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if (col_size != offsets.size())
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throw Exception("Size of offsets doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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std::shared_ptr<ColumnFixedString> res = std::make_shared<ColumnFixedString>(n);
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if (0 == col_size)
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return res;
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Chars_t & res_chars = res->chars;
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res_chars.reserve(n * offsets.back());
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Offset_t prev_offset = 0;
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for (size_t i = 0; i < col_size; ++i)
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{
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size_t size_to_replicate = offsets[i] - prev_offset;
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prev_offset = offsets[i];
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for (size_t j = 0; j < size_to_replicate; ++j)
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for (size_t k = 0; k < n; ++k)
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res_chars.push_back(chars[i * n + k]);
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}
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return res;
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}
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void reserve(size_t size) override
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{
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chars.reserve(n * size);
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};
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Chars_t & getChars() { return chars; }
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const Chars_t & getChars() const { return chars; }
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size_t getN() const { return n; }
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private:
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void getExtremesImpl(Field & min, Field & max, const PaddedPODArray<UInt8> * null_map_) const override
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{
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min = String();
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max = String();
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}
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};
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}
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