mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-24 08:32:02 +00:00
288 lines
7.4 KiB
C++
288 lines
7.4 KiB
C++
#pragma once
|
||
|
||
#include <string.h> // memcpy
|
||
|
||
#include <DB/Common/PODArray.h>
|
||
#include <DB/Common/Arena.h>
|
||
#include <DB/Columns/IColumn.h>
|
||
#include <DB/IO/ReadHelpers.h>
|
||
|
||
|
||
namespace DB
|
||
{
|
||
|
||
/** Cтолбeц значений типа "строка фиксированной длины".
|
||
* Если вставить строку меньшей длины, то она будет дополнена нулевыми байтами.
|
||
*/
|
||
class ColumnFixedString final : public IColumn
|
||
{
|
||
public:
|
||
typedef PODArray<UInt8> Chars_t;
|
||
|
||
private:
|
||
/// Байты строк, уложенные подряд. Строки хранятся без завершающего нулевого байта.
|
||
/** NOTE Требуется, чтобы смещение и тип chars в объекте был таким же, как у data в ColumnVector<UInt8>.
|
||
* Это используется в функции packFixed (AggregationCommon.h)
|
||
*/
|
||
Chars_t chars;
|
||
/// Размер строк.
|
||
const size_t n;
|
||
|
||
public:
|
||
/** Создать пустой столбец строк фиксированной длины n */
|
||
ColumnFixedString(size_t n_) : n(n_) {}
|
||
|
||
std::string getName() const override { return "ColumnFixedString"; }
|
||
|
||
ColumnPtr cloneEmpty() const override
|
||
{
|
||
return new ColumnFixedString(n);
|
||
}
|
||
|
||
size_t size() const override
|
||
{
|
||
return chars.size() / n;
|
||
}
|
||
|
||
size_t sizeOfField() const override
|
||
{
|
||
return n;
|
||
}
|
||
|
||
bool isFixed() const override
|
||
{
|
||
return true;
|
||
}
|
||
|
||
size_t byteSize() const override
|
||
{
|
||
return chars.size() + sizeof(n);
|
||
}
|
||
|
||
Field operator[](size_t index) const override
|
||
{
|
||
return String(reinterpret_cast<const char *>(&chars[n * index]), n);
|
||
}
|
||
|
||
void get(size_t index, Field & res) const override
|
||
{
|
||
res.assignString(reinterpret_cast<const char *>(&chars[n * index]), n);
|
||
}
|
||
|
||
StringRef getDataAt(size_t index) const override
|
||
{
|
||
return StringRef(&chars[n * index], n);
|
||
}
|
||
|
||
void insert(const Field & x) override
|
||
{
|
||
const String & s = DB::get<const String &>(x);
|
||
|
||
if (s.size() > n)
|
||
throw Exception("Too large string '" + s + "' for FixedString column", ErrorCodes::TOO_LARGE_STRING_SIZE);
|
||
|
||
size_t old_size = chars.size();
|
||
chars.resize_fill(old_size + n);
|
||
memcpy(&chars[old_size], s.data(), s.size());
|
||
}
|
||
|
||
void insertFrom(const IColumn & src_, size_t index) override
|
||
{
|
||
const ColumnFixedString & src = static_cast<const ColumnFixedString &>(src_);
|
||
|
||
if (n != src.getN())
|
||
throw Exception("Size of FixedString doesn't match", ErrorCodes::SIZE_OF_ARRAY_DOESNT_MATCH_SIZE_OF_FIXEDARRAY_COLUMN);
|
||
|
||
size_t old_size = chars.size();
|
||
chars.resize(old_size + n);
|
||
memcpy(&chars[old_size], &src.chars[n * index], n);
|
||
}
|
||
|
||
void insertData(const char * pos, size_t length) override
|
||
{
|
||
if (length > n)
|
||
throw Exception("Too large string for FixedString column", ErrorCodes::TOO_LARGE_STRING_SIZE);
|
||
|
||
size_t old_size = chars.size();
|
||
chars.resize_fill(old_size + n);
|
||
memcpy(&chars[old_size], pos, length);
|
||
}
|
||
|
||
void insertDefault() override
|
||
{
|
||
chars.resize_fill(chars.size() + n);
|
||
}
|
||
|
||
StringRef serializeValueIntoArena(size_t index, Arena & arena, char const *& begin) const override
|
||
{
|
||
auto pos = arena.allocContinue(n, begin);
|
||
memcpy(pos, &chars[n * index], n);
|
||
return StringRef(pos, n);
|
||
}
|
||
|
||
const char * deserializeAndInsertFromArena(const char * pos) override
|
||
{
|
||
size_t old_size = chars.size();
|
||
chars.resize(old_size + n);
|
||
memcpy(&chars[old_size], pos, n);
|
||
return pos + n;
|
||
}
|
||
|
||
int compareAt(size_t p1, size_t p2, const IColumn & rhs_, int nan_direction_hint) const override
|
||
{
|
||
const ColumnFixedString & rhs = static_cast<const ColumnFixedString &>(rhs_);
|
||
return memcmp(&chars[p1 * n], &rhs.chars[p2 * n], n);
|
||
}
|
||
|
||
template <bool positive>
|
||
struct less
|
||
{
|
||
const ColumnFixedString & parent;
|
||
less(const ColumnFixedString & parent_) : parent(parent_) {}
|
||
bool operator()(size_t lhs, size_t rhs) const
|
||
{
|
||
/// TODO: memcmp тормозит.
|
||
int res = memcmp(&parent.chars[lhs * parent.n], &parent.chars[rhs * parent.n], parent.n);
|
||
return positive ? (res < 0) : (res > 0);
|
||
}
|
||
};
|
||
|
||
void getPermutation(bool reverse, size_t limit, Permutation & res) const override
|
||
{
|
||
size_t s = size();
|
||
res.resize(s);
|
||
for (size_t i = 0; i < s; ++i)
|
||
res[i] = i;
|
||
|
||
if (limit >= s)
|
||
limit = 0;
|
||
|
||
if (limit)
|
||
{
|
||
if (reverse)
|
||
std::partial_sort(res.begin(), res.begin() + limit, res.end(), less<false>(*this));
|
||
else
|
||
std::partial_sort(res.begin(), res.begin() + limit, res.end(), less<true>(*this));
|
||
}
|
||
else
|
||
{
|
||
if (reverse)
|
||
std::sort(res.begin(), res.end(), less<false>(*this));
|
||
else
|
||
std::sort(res.begin(), res.end(), less<true>(*this));
|
||
}
|
||
}
|
||
|
||
void insertRangeFrom(const IColumn & src, size_t start, size_t length) override
|
||
{
|
||
const ColumnFixedString & src_concrete = static_cast<const ColumnFixedString &>(src);
|
||
|
||
if (start + length > src_concrete.size())
|
||
throw Exception("Parameters start = "
|
||
+ toString(start) + ", length = "
|
||
+ toString(length) + " are out of bound in ColumnFixedString::insertRangeFrom method"
|
||
" (size() = " + toString(src_concrete.size()) + ").",
|
||
ErrorCodes::PARAMETER_OUT_OF_BOUND);
|
||
|
||
size_t old_size = chars.size();
|
||
chars.resize(old_size + length * n);
|
||
memcpy(&chars[old_size], &src_concrete.chars[start * n], length * n);
|
||
}
|
||
|
||
ColumnPtr filter(const IColumn::Filter & filt) const override
|
||
{
|
||
size_t col_size = size();
|
||
if (col_size != filt.size())
|
||
throw Exception("Size of filter doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
|
||
|
||
ColumnFixedString * res_ = new ColumnFixedString(n);
|
||
ColumnPtr res = res_;
|
||
res_->chars.reserve(chars.size());
|
||
|
||
size_t offset = 0;
|
||
for (size_t i = 0; i < col_size; ++i, offset += n)
|
||
{
|
||
if (filt[i])
|
||
{
|
||
res_->chars.resize(res_->chars.size() + n);
|
||
memcpy(&res_->chars[res_->chars.size() - n], &chars[offset], n);
|
||
}
|
||
}
|
||
|
||
return res;
|
||
}
|
||
|
||
ColumnPtr permute(const Permutation & perm, size_t limit) const override
|
||
{
|
||
size_t col_size = size();
|
||
|
||
if (limit == 0)
|
||
limit = col_size;
|
||
else
|
||
limit = std::min(col_size, limit);
|
||
|
||
if (perm.size() < limit)
|
||
throw Exception("Size of permutation is less than required.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
|
||
|
||
if (limit == 0)
|
||
return new ColumnFixedString(n);
|
||
|
||
ColumnFixedString * res_ = new ColumnFixedString(n);
|
||
ColumnPtr res = res_;
|
||
|
||
Chars_t & res_chars = res_->chars;
|
||
|
||
res_chars.resize(n * limit);
|
||
|
||
size_t offset = 0;
|
||
for (size_t i = 0; i < limit; ++i, offset += n)
|
||
memcpy(&res_chars[offset], &chars[perm[i] * n], n);
|
||
|
||
return res;
|
||
}
|
||
|
||
ColumnPtr replicate(const Offsets_t & offsets) const override
|
||
{
|
||
size_t col_size = size();
|
||
if (col_size != offsets.size())
|
||
throw Exception("Size of offsets doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
|
||
|
||
ColumnFixedString * res_ = new ColumnFixedString(n);
|
||
ColumnPtr res = res_;
|
||
|
||
if (0 == col_size)
|
||
return res;
|
||
|
||
Chars_t & res_chars = res_->chars;
|
||
res_chars.reserve(n * offsets.back());
|
||
|
||
Offset_t prev_offset = 0;
|
||
for (size_t i = 0; i < col_size; ++i)
|
||
{
|
||
size_t size_to_replicate = offsets[i] - prev_offset;
|
||
prev_offset = offsets[i];
|
||
|
||
for (size_t j = 0; j < size_to_replicate; ++j)
|
||
for (size_t k = 0; k < n; ++k)
|
||
res_chars.push_back(chars[i * n + k]);
|
||
}
|
||
|
||
return res;
|
||
}
|
||
|
||
void getExtremes(Field & min, Field & max) const override
|
||
{
|
||
min = String();
|
||
max = String();
|
||
}
|
||
|
||
|
||
Chars_t & getChars() { return chars; }
|
||
const Chars_t & getChars() const { return chars; }
|
||
|
||
size_t getN() const { return n; }
|
||
};
|
||
|
||
|
||
}
|