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https://github.com/ClickHouse/ClickHouse.git
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357 lines
9.5 KiB
C++
357 lines
9.5 KiB
C++
#pragma once
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#include <string.h>
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#include <DB/Core/Defines.h>
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#include <DB/Columns/IColumn.h>
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#include <DB/Common/Collator.h>
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namespace DB
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{
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/** Cтолбeц значений типа "строка".
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*/
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class ColumnString : public IColumn
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{
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public:
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typedef std::vector<UInt8> Chars_t;
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private:
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/// По индексу i находится смещение до начала i + 1 -го элемента.
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Offsets_t offsets;
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/// Байты строк, уложенные подряд. Строки хранятся с завершающим нулевым байтом.
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Chars_t chars;
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size_t __attribute__((__always_inline__)) offsetAt(size_t i) const { return i == 0 ? 0 : offsets[i - 1]; }
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/// Размер, включая завершающий нулевой байт.
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size_t __attribute__((__always_inline__)) sizeAt(size_t i) const { return i == 0 ? offsets[0] : (offsets[i] - offsets[i - 1]); }
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public:
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/** Создать пустой столбец строк */
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ColumnString() {}
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std::string getName() const { return "ColumnString"; }
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size_t size() const
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{
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return offsets.size();
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}
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size_t byteSize() const
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{
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return chars.size() + offsets.size() * sizeof(offsets[0]);
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}
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ColumnPtr cloneEmpty() const
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{
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return new ColumnString;
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}
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Field operator[](size_t n) const
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{
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return Field(&chars[offsetAt(n)], sizeAt(n) - 1);
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}
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void get(size_t n, Field & res) const
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{
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res.assignString(&chars[offsetAt(n)], sizeAt(n) - 1);
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}
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StringRef getDataAt(size_t n) const
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{
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return StringRef(&chars[offsetAt(n)], sizeAt(n) - 1);
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}
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StringRef getDataAtWithTerminatingZero(size_t n) const
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{
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return StringRef(&chars[offsetAt(n)], sizeAt(n));
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}
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void insert(const Field & x)
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{
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const String & s = DB::get<const String &>(x);
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size_t old_size = chars.size();
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size_t size_to_append = s.size() + 1;
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chars.resize(old_size + size_to_append);
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memcpy(&chars[old_size], s.c_str(), size_to_append);
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offsets.push_back((offsets.size() == 0 ? 0 : offsets.back()) + size_to_append);
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}
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void insertFrom(const IColumn & src_, size_t n)
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{
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const ColumnString & src = static_cast<const ColumnString &>(src_);
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size_t old_size = chars.size();
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size_t size_to_append = src.sizeAt(n);
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size_t offset = src.offsetAt(n);
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chars.resize(old_size + size_to_append);
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memcpy(&chars[old_size], &src.chars[offset], size_to_append);
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offsets.push_back((offsets.size() == 0 ? 0 : offsets.back()) + size_to_append);
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}
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void insertData(const char * pos, size_t length)
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{
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size_t old_size = chars.size();
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chars.resize(old_size + length + 1);
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memcpy(&chars[old_size], pos, length);
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chars[old_size + length] = 0;
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offsets.push_back((offsets.size() == 0 ? 0 : offsets.back()) + length + 1);
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}
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void insertDataWithTerminatingZero(const char * pos, size_t length)
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{
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size_t old_size = chars.size();
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chars.resize(old_size + length);
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memcpy(&chars[old_size], pos, length);
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offsets.push_back((offsets.size() == 0 ? 0 : offsets.back()) + length);
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}
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ColumnPtr cut(size_t start, size_t length) const
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{
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if (length == 0)
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return new ColumnString;
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if (start + length > offsets.size())
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throw Exception("Parameter out of bound in IColumnString::cut() method.",
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ErrorCodes::PARAMETER_OUT_OF_BOUND);
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size_t nested_offset = offsetAt(start);
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size_t nested_length = offsets[start + length - 1] - nested_offset;
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ColumnString * res_ = new ColumnString;
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ColumnPtr res = res_;
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res_->chars.resize(nested_length);
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memcpy(&res_->chars[0], &chars[nested_offset], nested_length);
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Offsets_t & res_offsets = res_->offsets;
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if (start == 0)
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{
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res_offsets.assign(offsets.begin(), offsets.begin() + length);
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}
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else
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{
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res_offsets.resize(length);
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for (size_t i = 0; i < length; ++i)
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res_offsets[i] = offsets[start + i] - nested_offset;
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}
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return res;
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}
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ColumnPtr filter(const Filter & filt) const
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{
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size_t size = offsets.size();
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if (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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if (size == 0)
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return new ColumnString;
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ColumnString * res_ = new ColumnString;
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ColumnPtr res = res_;
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Chars_t & res_chars = res_->chars;
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Offsets_t & res_offsets = res_->offsets;
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res_chars.reserve(chars.size());
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res_offsets.reserve(size);
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Offset_t current_new_offset = 0;
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for (size_t i = 0; i < size; ++i)
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{
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if (!filt[i])
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continue;
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size_t string_offset = i == 0 ? 0 : offsets[i - 1];
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size_t string_size = offsets[i] - string_offset;
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current_new_offset += string_size;
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res_offsets.push_back(current_new_offset);
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res_chars.resize(res_chars.size() + string_size);
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memcpy(&res_chars[res_chars.size() - string_size], &chars[string_offset], string_size);
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}
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return res;
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}
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ColumnPtr permute(const Permutation & perm) const
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{
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size_t size = offsets.size();
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if (size != perm.size())
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throw Exception("Size of permutation doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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if (size == 0)
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return new ColumnString;
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ColumnString * res_ = new ColumnString;
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ColumnPtr res = res_;
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Chars_t & res_chars = res_->chars;
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Offsets_t & res_offsets = res_->offsets;
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res_chars.resize(chars.size());
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res_offsets.resize(size);
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Offset_t current_new_offset = 0;
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for (size_t i = 0; i < size; ++i)
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{
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size_t j = perm[i];
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size_t string_offset = j == 0 ? 0 : offsets[j - 1];
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size_t string_size = offsets[j] - string_offset;
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memcpy(&res_chars[current_new_offset], &chars[string_offset], string_size);
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current_new_offset += string_size;
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res_offsets[i] = current_new_offset;
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}
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return res;
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}
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void insertDefault()
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{
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chars.push_back(0);
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offsets.push_back(offsets.size() == 0 ? 1 : (offsets.back() + 1));
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}
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int compareAt(size_t n, size_t m, const IColumn & rhs_) const
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{
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const ColumnString & rhs = static_cast<const ColumnString &>(rhs_);
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/** Для производительности, строки сравниваются до первого нулевого байта.
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* (если нулевой байт в середине строки, то то, что после него - игнорируется)
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* Замечу, что завершающий нулевой байт всегда есть.
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*/
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return strcmp(
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reinterpret_cast<const char *>(&chars[offsetAt(n)]),
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reinterpret_cast<const char *>(&rhs.chars[rhs.offsetAt(m)]));
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}
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/// Версия compareAt для locale-sensitive сравнения строк
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int compareAtWithCollation(size_t n, size_t m, const IColumn & rhs_, const Collator & collator) const
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{
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const ColumnString & rhs = static_cast<const ColumnString &>(rhs_);
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return collator.compare(
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reinterpret_cast<const char *>(&chars[offsetAt(n)]), sizeAt(n),
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reinterpret_cast<const char *>(&rhs.chars[rhs.offsetAt(m)]), rhs.sizeAt(m));
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}
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struct less
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{
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const ColumnString & parent;
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less(const ColumnString & parent_) : parent(parent_) {}
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bool operator()(size_t lhs, size_t rhs) const
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{
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return 0 > strcmp(
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reinterpret_cast<const char *>(&parent.chars[parent.offsetAt(lhs)]),
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reinterpret_cast<const char *>(&parent.chars[parent.offsetAt(rhs)]));
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}
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};
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Permutation getPermutation() const
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{
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size_t s = offsets.size();
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Permutation res(s);
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for (size_t i = 0; i < s; ++i)
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res[i] = i;
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std::sort(res.begin(), res.end(), less(*this));
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return res;
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}
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struct lessWithCollation
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{
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const ColumnString & parent;
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const Collator & collator;
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lessWithCollation(const ColumnString & parent_, const Collator & collator_) : parent(parent_), collator(collator_) {}
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bool operator()(size_t lhs, size_t rhs) const
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{
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return 0 > collator.compare(
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reinterpret_cast<const char *>(&parent.chars[parent.offsetAt(lhs)]), parent.sizeAt(lhs),
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reinterpret_cast<const char *>(&parent.chars[parent.offsetAt(rhs)]), parent.sizeAt(rhs));
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}
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};
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/// Сортировка с учетом Collation
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Permutation getPermutationWithCollation(const Collator & collator) const
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{
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size_t s = offsets.size();
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Permutation res(s);
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for (size_t i = 0; i < s; ++i)
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res[i] = i;
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std::sort(res.begin(), res.end(), lessWithCollation(*this, collator));
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return res;
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}
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ColumnPtr replicate(const Offsets_t & replicate_offsets) const
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{
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size_t col_size = size();
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if (col_size != replicate_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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ColumnString * res_ = new ColumnString;
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ColumnPtr res = res_;
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Chars_t & res_chars = res_->chars;
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Offsets_t & res_offsets = res_->offsets;
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res_chars.reserve(chars.size() / col_size * replicate_offsets.back());
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res_offsets.reserve(replicate_offsets.back());
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Offset_t prev_replicate_offset = 0;
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Offset_t prev_string_offset = 0;
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Offset_t current_new_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 = replicate_offsets[i] - prev_replicate_offset;
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size_t string_size = offsets[i] - prev_string_offset;
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for (size_t j = 0; j < size_to_replicate; ++j)
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{
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current_new_offset += string_size;
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res_offsets.push_back(current_new_offset);
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res_chars.resize(res_chars.size() + string_size);
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memcpy(&res_chars[res_chars.size() - string_size], &chars[prev_string_offset], string_size);
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}
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prev_replicate_offset = replicate_offsets[i];
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prev_string_offset = offsets[i];
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}
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return res;
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}
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void reserve(size_t n)
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{
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offsets.reserve(n);
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chars.reserve(n * DBMS_APPROX_STRING_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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Offsets_t & getOffsets() { return offsets; }
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const Offsets_t & getOffsets() const { return offsets; }
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};
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}
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