mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-29 19:12:03 +00:00
317 lines
9.2 KiB
C++
317 lines
9.2 KiB
C++
#pragma once
|
||
|
||
#include <string.h> // memcpy
|
||
|
||
#include <Poco/SharedPtr.h>
|
||
|
||
#include <DB/Core/Exception.h>
|
||
#include <DB/Core/ErrorCodes.h>
|
||
|
||
#include <DB/Columns/IColumn.h>
|
||
#include <DB/Columns/ColumnsNumber.h>
|
||
|
||
|
||
namespace DB
|
||
{
|
||
|
||
using Poco::SharedPtr;
|
||
|
||
/** Cтолбeц значений типа вложенная таблица.
|
||
* В памяти это выглядит, как столбцы вложенных типов одинковой длины, равной сумме размеров всех массивов с общим именем,
|
||
* и как общий для всех столбцов массив смещений, который позволяет достать каждый элемент.
|
||
*
|
||
* Не предназначен для возвращения результа в запросах SELECT. Предполагается, что для SELECT'а будут отдаваться
|
||
* столбцы вида ColumnArray, ссылающиеся на один массив Offset'ов и соответствующий массив с данными.
|
||
*
|
||
* Используется для сериализации вложенной таблицы.
|
||
*/
|
||
class ColumnNested : public IColumn
|
||
{
|
||
public:
|
||
/** По индексу i находится смещение до начала i + 1 -го элемента. */
|
||
typedef ColumnVector<Offset_t> ColumnOffsets_t;
|
||
|
||
/** Создать пустой столбец вложенных таблиц, с типом значений, как в столбце nested_column */
|
||
explicit ColumnNested(Columns nested_columns, ColumnPtr offsets_column = NULL)
|
||
: data(nested_columns), offsets(offsets_column)
|
||
{
|
||
if (!offsets_column)
|
||
{
|
||
offsets = new ColumnOffsets_t;
|
||
}
|
||
else
|
||
{
|
||
if (!dynamic_cast<ColumnOffsets_t *>(&*offsets_column))
|
||
throw Exception("offsets_column must be a ColumnVector<UInt64>", ErrorCodes::ILLEGAL_COLUMN);
|
||
}
|
||
}
|
||
|
||
std::string getName() const
|
||
{
|
||
std::string res;
|
||
{
|
||
WriteBufferFromString out(res);
|
||
|
||
for (Columns::const_iterator it = data.begin(); it != data.end(); ++it)
|
||
{
|
||
if (it != data.begin())
|
||
writeCString(", ", out);
|
||
writeString((*it)->getName(), out);
|
||
}
|
||
}
|
||
return "ColumnNested(" + res + ")";
|
||
}
|
||
|
||
ColumnPtr cloneEmpty() const
|
||
{
|
||
Columns res(data.size());
|
||
for (size_t i = 0; i < data.size(); ++i)
|
||
res[i] = data[i]->cloneEmpty();
|
||
return new ColumnNested(res);
|
||
}
|
||
|
||
size_t size() const
|
||
{
|
||
return getOffsets().size();
|
||
}
|
||
|
||
Field operator[](size_t n) const
|
||
{
|
||
throw Exception("Method operator[] is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
void get(size_t n, Field & res) const
|
||
{
|
||
throw Exception("Method get is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
StringRef getDataAt(size_t n) const
|
||
{
|
||
throw Exception("Method getDataAt is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
void insertData(const char * pos, size_t length)
|
||
{
|
||
throw Exception("Method insertData is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
ColumnPtr cut(size_t start, size_t length) const
|
||
{
|
||
if (length == 0)
|
||
return new ColumnNested(data);
|
||
|
||
if (start + length > getOffsets().size())
|
||
throw Exception("Parameter out of bound in ColumnNested::cut() method.",
|
||
ErrorCodes::PARAMETER_OUT_OF_BOUND);
|
||
|
||
size_t nested_offset = offsetAt(start);
|
||
size_t nested_length = getOffsets()[start + length - 1] - nested_offset;
|
||
|
||
ColumnNested * res_ = new ColumnNested(data);
|
||
ColumnPtr res = res_;
|
||
|
||
for (size_t i = 0; i < data.size(); ++i)
|
||
res_->data[i] = data[i]->cut(nested_offset, nested_length);
|
||
|
||
Offsets_t & res_offsets = res_->getOffsets();
|
||
|
||
if (start == 0)
|
||
{
|
||
res_offsets.assign(getOffsets().begin(), getOffsets().begin() + length);
|
||
}
|
||
else
|
||
{
|
||
res_offsets.resize(length);
|
||
|
||
for (size_t i = 0; i < length; ++i)
|
||
res_offsets[i] = getOffsets()[start + i] - nested_offset;
|
||
}
|
||
|
||
return res;
|
||
}
|
||
|
||
void insert(const Field & x)
|
||
{
|
||
throw Exception("Method insert is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
void insertFrom(const IColumn & src_, size_t n)
|
||
{
|
||
const ColumnNested & src = static_cast<const ColumnNested &>(src_);
|
||
|
||
if (data.size() != src.getData().size())
|
||
throw Exception("Number of columns in nested tables do not match.", ErrorCodes::NUMBER_OF_COLUMNS_DOESNT_MATCH);
|
||
|
||
size_t size = src.sizeAt(n);
|
||
size_t offset = src.offsetAt(n);
|
||
|
||
for (size_t i = 0; i < data.size(); ++i)
|
||
{
|
||
if (data[i]->getName() != src.getData()[i]->getName())
|
||
throw Exception("Types of columns in nested tables do not match.", ErrorCodes::TYPE_MISMATCH);
|
||
|
||
for (size_t j = 0; j < size; ++j)
|
||
data[i]->insertFrom(*src.getData()[i], offset + j);
|
||
}
|
||
|
||
getOffsets().push_back((getOffsets().size() == 0 ? 0 : getOffsets().back()) + size);
|
||
}
|
||
|
||
void insertDefault()
|
||
{
|
||
for (size_t i = 0; i < data.size(); ++i)
|
||
data[i]->insertDefault();
|
||
getOffsets().push_back(getOffsets().size() == 0 ? 1 : (getOffsets().back() + 1));
|
||
}
|
||
|
||
ColumnPtr filter(const Filter & filt) const
|
||
{
|
||
size_t size = getOffsets().size();
|
||
if (size != filt.size())
|
||
throw Exception("Size of filter doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
|
||
|
||
if (size == 0)
|
||
return new ColumnNested(data);
|
||
|
||
/// Не слишком оптимально. Можно сделать специализацию для массивов известных типов.
|
||
Filter nested_filt(getOffsets().back());
|
||
for (size_t i = 0; i < size; ++i)
|
||
{
|
||
if (filt[i])
|
||
memset(&nested_filt[offsetAt(i)], 1, sizeAt(i));
|
||
else
|
||
memset(&nested_filt[offsetAt(i)], 0, sizeAt(i));
|
||
}
|
||
|
||
ColumnNested * res_ = new ColumnNested(data);
|
||
ColumnPtr res = res_;
|
||
for (size_t i = 0; i < data.size(); ++i)
|
||
res_->data[i] = data[i]->filter(nested_filt);
|
||
|
||
Offsets_t & res_offsets = res_->getOffsets();
|
||
res_offsets.reserve(size);
|
||
|
||
size_t current_offset = 0;
|
||
for (size_t i = 0; i < size; ++i)
|
||
{
|
||
if (filt[i])
|
||
{
|
||
current_offset += sizeAt(i);
|
||
res_offsets.push_back(current_offset);
|
||
}
|
||
}
|
||
|
||
return res;
|
||
}
|
||
|
||
ColumnPtr replicate(const Offsets_t & offsets) const
|
||
{
|
||
throw Exception("Replication of ColumnNested is not implemented.", ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
ColumnPtr permute(const Permutation & perm, size_t limit) const
|
||
{
|
||
size_t size = getOffsets().size();
|
||
if (size != perm.size())
|
||
throw Exception("Size of permutation doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
|
||
|
||
if (limit == 0)
|
||
limit = size;
|
||
else
|
||
limit = std::min(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 ColumnNested(data);
|
||
|
||
Permutation nested_perm(getOffsets().back());
|
||
|
||
Columns cloned_columns(data.size());
|
||
for (size_t i = 0; i < data.size(); ++i)
|
||
cloned_columns[i] = data[i]->cloneEmpty();
|
||
|
||
ColumnNested * res_ = new ColumnNested(cloned_columns);
|
||
ColumnPtr res = res_;
|
||
|
||
Offsets_t & res_offsets = res_->getOffsets();
|
||
res_offsets.resize(limit);
|
||
size_t current_offset = 0;
|
||
|
||
for (size_t i = 0; i < limit; ++i)
|
||
{
|
||
for (size_t j = 0; j < sizeAt(perm[i]); ++j)
|
||
nested_perm[current_offset + j] = offsetAt(perm[i]) + j;
|
||
current_offset += sizeAt(perm[i]);
|
||
res_offsets[i] = current_offset;
|
||
}
|
||
|
||
if (current_offset != 0)
|
||
for (size_t i = 0; i < data.size(); ++i)
|
||
res_->data[i] = data[i]->permute(nested_perm, current_offset);
|
||
|
||
return res;
|
||
}
|
||
|
||
int compareAt(size_t n, size_t m, const IColumn & rhs_, int nan_direction_hint) const
|
||
{
|
||
throw Exception("Method compareAt is not supported for ColumnNested.", ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
void getPermutation(bool reverse, size_t limit, Permutation & res) const
|
||
{
|
||
throw Exception("Method getPermutation is not supported for ColumnNested.", ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
void reserve(size_t n)
|
||
{
|
||
getOffsets().reserve(n);
|
||
for (Columns::iterator it = data.begin(); it != data.end(); ++it)
|
||
(*it)->reserve(n);
|
||
}
|
||
|
||
size_t byteSize() const
|
||
{
|
||
size_t size = getOffsets().size() * sizeof(getOffsets()[0]);
|
||
for (Columns::const_iterator it = data.begin(); it != data.end(); ++it)
|
||
size += (*it)->byteSize();
|
||
return size;
|
||
}
|
||
|
||
void getExtremes(Field & min, Field & max) const
|
||
{
|
||
throw Exception("Method getExtremes is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
|
||
}
|
||
|
||
/** Более эффективные методы манипуляции */
|
||
Columns & getData() { return data; }
|
||
const Columns & getData() const { return data; }
|
||
|
||
// ColumnPtr & getDataPtr() { return data; }
|
||
// const ColumnPtr & getDataPtr() const { return data; }
|
||
|
||
Offsets_t & __attribute__((__always_inline__)) getOffsets()
|
||
{
|
||
return static_cast<ColumnOffsets_t &>(*offsets.get()).getData();
|
||
}
|
||
|
||
const Offsets_t & __attribute__((__always_inline__)) getOffsets() const
|
||
{
|
||
return static_cast<const ColumnOffsets_t &>(*offsets.get()).getData();
|
||
}
|
||
|
||
ColumnPtr & getOffsetsColumn() { return offsets; }
|
||
const ColumnPtr & getOffsetsColumn() const { return offsets; }
|
||
|
||
private:
|
||
Columns data;
|
||
ColumnPtr offsets;
|
||
|
||
size_t __attribute__((__always_inline__)) offsetAt(size_t i) const { return i == 0 ? 0 : getOffsets()[i - 1]; }
|
||
size_t __attribute__((__always_inline__)) sizeAt(size_t i) const { return i == 0 ? getOffsets()[0] : (getOffsets()[i] - getOffsets()[i - 1]); }
|
||
};
|
||
|
||
|
||
}
|