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512 lines
16 KiB
C++
512 lines
16 KiB
C++
#pragma once
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#include <string.h> // memcpy
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#include <Poco/SharedPtr.h>
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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#include <DB/Columns/IColumn.h>
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#include <DB/Columns/ColumnsNumber.h>
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#include <DB/Columns/ColumnString.h>
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namespace DB
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{
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using Poco::SharedPtr;
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/** Cтолбeц значений типа массив.
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* В памяти он представлен, как один столбец вложенного типа, размер которого равен сумме размеров всех массивов,
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* и как массив смещений в нём, который позволяет достать каждый элемент.
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*/
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class ColumnArray final : public IColumn
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{
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public:
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/** По индексу i находится смещение до начала i + 1 -го элемента. */
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typedef ColumnVector<Offset_t> ColumnOffsets_t;
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/** Создать пустой столбец массивов, с типом значений, как в столбце nested_column */
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explicit ColumnArray(ColumnPtr nested_column, ColumnPtr offsets_column = nullptr)
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: data(nested_column), offsets(offsets_column)
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{
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if (!offsets_column)
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{
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offsets = new ColumnOffsets_t;
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}
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else
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{
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if (!typeid_cast<ColumnOffsets_t *>(&*offsets_column))
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throw Exception("offsets_column must be a ColumnVector<UInt64>", ErrorCodes::ILLEGAL_COLUMN);
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}
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}
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std::string getName() const override { return "ColumnArray(" + data->getName() + ")"; }
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ColumnPtr cloneEmpty() const override
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{
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return new ColumnArray(data->cloneEmpty());
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}
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size_t size() const override
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{
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return getOffsets().size();
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}
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Field operator[](size_t n) const override
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{
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size_t offset = offsetAt(n);
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size_t size = sizeAt(n);
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Array res(size);
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for (size_t i = 0; i < size; ++i)
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res[i] = (*data)[offset + i];
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return res;
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}
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void get(size_t n, Field & res) const override
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{
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size_t offset = offsetAt(n);
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size_t size = sizeAt(n);
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res = Array(size);
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Array & res_arr = DB::get<Array &>(res);
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for (size_t i = 0; i < size; ++i)
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data->get(offset + i, res_arr[i]);
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}
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StringRef getDataAt(size_t n) const override
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{
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/** Работает для массивов значений фиксированной длины.
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* Для массивов строк и массивов массивов полученный кусок памяти может не взаимно-однозначно соответствовать элементам.
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*/
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StringRef begin = data->getDataAt(offsetAt(n));
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StringRef end = data->getDataAt(offsetAt(n) + sizeAt(n));
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return StringRef(begin.data, end.data - begin.data);
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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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/** Аналогично - только для массивов значений фиксированной длины.
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*/
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IColumn * data_ = data.get();
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if (!data_->isFixed())
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throw Exception("Method insertData is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
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size_t field_size = data_->sizeOfField();
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const char * end = pos + length;
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size_t elems = 0;
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for (; pos + field_size <= end; pos += field_size, ++elems)
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data_->insertData(pos, field_size);
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if (pos != end)
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throw Exception("Incorrect length argument for method ColumnArray::insertData", ErrorCodes::BAD_ARGUMENTS);
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getOffsets().push_back((getOffsets().size() == 0 ? 0 : getOffsets().back()) + elems);
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}
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ColumnPtr cut(size_t start, size_t length) const override
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{
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if (length == 0)
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return new ColumnArray(data);
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if (start + length > getOffsets().size())
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throw Exception("Parameter out of bound in IColumnArray::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 = getOffsets()[start + length - 1] - nested_offset;
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ColumnArray * res_ = new ColumnArray(data);
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ColumnPtr res = res_;
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res_->data = data->cut(nested_offset, nested_length);
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Offsets_t & res_offsets = res_->getOffsets();
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if (start == 0)
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{
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res_offsets.assign(getOffsets().begin(), getOffsets().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] = getOffsets()[start + i] - nested_offset;
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}
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return res;
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}
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void insert(const Field & x) override
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{
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const Array & array = DB::get<const Array &>(x);
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size_t size = array.size();
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for (size_t i = 0; i < size; ++i)
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data->insert(array[i]);
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getOffsets().push_back((getOffsets().size() == 0 ? 0 : getOffsets().back()) + size);
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}
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void insertFrom(const IColumn & src_, size_t n) override
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{
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const ColumnArray & src = static_cast<const ColumnArray &>(src_);
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size_t size = src.sizeAt(n);
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size_t offset = src.offsetAt(n);
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for (size_t i = 0; i < size; ++i)
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data->insertFrom(src.getData(), offset + i);
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getOffsets().push_back((getOffsets().size() == 0 ? 0 : getOffsets().back()) + size);
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}
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void insertDefault() override
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{
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getOffsets().push_back(getOffsets().size() == 0 ? 0 : getOffsets().back());
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}
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ColumnPtr filter(const Filter & filt) const override
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{
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size_t size = getOffsets().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 ColumnArray(data);
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/// Не слишком оптимально. Можно сделать специализацию для массивов известных типов.
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Filter nested_filt(getOffsets().back());
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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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memset(&nested_filt[offsetAt(i)], 1, sizeAt(i));
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else
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memset(&nested_filt[offsetAt(i)], 0, sizeAt(i));
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}
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ColumnArray * res_ = new ColumnArray(data);
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ColumnPtr res = res_;
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res_->data = data->filter(nested_filt);
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Offsets_t & res_offsets = res_->getOffsets();
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res_offsets.reserve(size);
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size_t current_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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{
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current_offset += sizeAt(i);
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res_offsets.push_back(current_offset);
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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 size = getOffsets().size();
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if (limit == 0)
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limit = size;
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else
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limit = std::min(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 new ColumnArray(data);
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Permutation nested_perm(getOffsets().back());
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ColumnArray * res_ = new ColumnArray(data->cloneEmpty());
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ColumnPtr res = res_;
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Offsets_t & res_offsets = res_->getOffsets();
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res_offsets.resize(limit);
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size_t current_offset = 0;
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for (size_t i = 0; i < limit; ++i)
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{
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for (size_t j = 0; j < sizeAt(perm[i]); ++j)
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nested_perm[current_offset + j] = offsetAt(perm[i]) + j;
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current_offset += sizeAt(perm[i]);
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res_offsets[i] = current_offset;
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}
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if (current_offset != 0)
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res_->data = data->permute(nested_perm, current_offset);
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return res;
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}
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int compareAt(size_t n, size_t m, const IColumn & rhs_, int nan_direction_hint) const override
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{
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const ColumnArray & rhs = static_cast<const ColumnArray &>(rhs_);
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/// Не оптимально
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size_t lhs_size = sizeAt(n);
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size_t rhs_size = rhs.sizeAt(m);
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size_t min_size = std::min(lhs_size, rhs_size);
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for (size_t i = 0; i < min_size; ++i)
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if (int res = data.get()->compareAt(offsetAt(n) + i, rhs.offsetAt(m) + i, *rhs.data.get(), nan_direction_hint))
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return res;
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return lhs_size < rhs_size
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? -1
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: (lhs_size == rhs_size
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? 0
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: 1);
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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 ColumnArray & parent;
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less(const ColumnArray & parent_) : parent(parent_) {}
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bool operator()(size_t lhs, size_t rhs) const
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{
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if (positive)
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return parent.compareAt(lhs, rhs, parent, 1) < 0;
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else
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return parent.compareAt(lhs, rhs, parent, -1) > 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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if (limit >= s)
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limit = 0;
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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)
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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 reserve(size_t n) override
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{
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getOffsets().reserve(n);
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getData().reserve(n); /// Средний размер массивов тут никак не учитывается. Или считается, что он не больше единицы.
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}
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size_t byteSize() const override
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{
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return data->byteSize() + getOffsets().size() * sizeof(getOffsets()[0]);
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}
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void getExtremes(Field & min, Field & max) const override
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{
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min = Array();
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max = Array();
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}
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bool hasEqualOffsets(const ColumnArray & other) const
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{
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if (offsets == other.offsets)
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return true;
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const Offsets_t & offsets1 = getOffsets();
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const Offsets_t & offsets2 = other.getOffsets();
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return offsets1.size() == offsets2.size() && 0 == memcmp(&offsets1[0], &offsets2[0], sizeof(offsets1[0]) * offsets1.size());
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}
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/** Более эффективные методы манипуляции */
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IColumn & getData() { return *data; }
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const IColumn & getData() const { return *data; }
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ColumnPtr & getDataPtr() { return data; }
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const ColumnPtr & getDataPtr() const { return data; }
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Offsets_t & ALWAYS_INLINE getOffsets()
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{
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return static_cast<ColumnOffsets_t &>(*offsets.get()).getData();
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}
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const Offsets_t & ALWAYS_INLINE getOffsets() const
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{
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return static_cast<const ColumnOffsets_t &>(*offsets.get()).getData();
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}
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ColumnPtr & getOffsetsColumn() { return offsets; }
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const ColumnPtr & getOffsetsColumn() const { return offsets; }
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ColumnPtr replicate(const Offsets_t & replicate_offsets) const override
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{
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/// Не получается реализовать в общем случае.
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if (typeid_cast<const ColumnUInt8 *>(&*data)) return replicate<UInt8>(replicate_offsets);
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if (typeid_cast<const ColumnUInt16 *>(&*data)) return replicate<UInt16>(replicate_offsets);
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if (typeid_cast<const ColumnUInt32 *>(&*data)) return replicate<UInt32>(replicate_offsets);
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if (typeid_cast<const ColumnUInt64 *>(&*data)) return replicate<UInt64>(replicate_offsets);
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if (typeid_cast<const ColumnInt8 *>(&*data)) return replicate<Int8>(replicate_offsets);
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if (typeid_cast<const ColumnInt16 *>(&*data)) return replicate<Int16>(replicate_offsets);
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if (typeid_cast<const ColumnInt32 *>(&*data)) return replicate<Int32>(replicate_offsets);
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if (typeid_cast<const ColumnInt64 *>(&*data)) return replicate<Int64>(replicate_offsets);
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if (typeid_cast<const ColumnFloat32 *>(&*data)) return replicate<Float32>(replicate_offsets);
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if (typeid_cast<const ColumnFloat64 *>(&*data)) return replicate<Float64>(replicate_offsets);
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if (typeid_cast<const ColumnString *>(&*data)) return replicateString(replicate_offsets);
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throw Exception("Replication of column " + getName() + " is not implemented.", ErrorCodes::NOT_IMPLEMENTED);
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}
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private:
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ColumnPtr data;
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ColumnPtr offsets; /// Смещения могут быть разделяемыми для нескольких столбцов - для реализации вложенных структур данных.
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size_t ALWAYS_INLINE offsetAt(size_t i) const { return i == 0 ? 0 : getOffsets()[i - 1]; }
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size_t ALWAYS_INLINE sizeAt(size_t i) const { return i == 0 ? getOffsets()[0] : (getOffsets()[i] - getOffsets()[i - 1]); }
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/// Размножить значения, если вложенный столбец - ColumnArray<T>.
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template <typename T>
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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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ColumnPtr res = cloneEmpty();
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if (0 == col_size)
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return res;
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ColumnArray & res_ = typeid_cast<ColumnArray &>(*res);
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const typename ColumnVector<T>::Container_t & cur_data = typeid_cast<const ColumnVector<T> &>(*data).getData();
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const Offsets_t & cur_offsets = getOffsets();
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typename ColumnVector<T>::Container_t & res_data = typeid_cast<ColumnVector<T> &>(res_.getData()).getData();
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Offsets_t & res_offsets = res_.getOffsets();
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res_data.reserve(data->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_data_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 value_size = cur_offsets[i] - prev_data_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 += value_size;
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res_offsets.push_back(current_new_offset);
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res_data.resize(res_data.size() + value_size);
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memcpy(&res_data[res_data.size() - value_size], &cur_data[prev_data_offset], value_size * sizeof(T));
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}
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prev_replicate_offset = replicate_offsets[i];
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prev_data_offset = cur_offsets[i];
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}
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return res;
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}
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/// Размножить значения, если вложенный столбец - ColumnString. Код слишком сложный.
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ColumnPtr replicateString(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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ColumnPtr res = cloneEmpty();
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if (0 == col_size)
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return res;
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ColumnArray & res_ = typeid_cast<ColumnArray &>(*res);
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const ColumnString & cur_string = typeid_cast<const ColumnString &>(*data);
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const ColumnString::Chars_t & cur_chars = cur_string.getChars();
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const Offsets_t & cur_string_offsets = cur_string.getOffsets();
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const Offsets_t & cur_offsets = getOffsets();
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ColumnString::Chars_t & res_chars = typeid_cast<ColumnString &>(res_.getData()).getChars();
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Offsets_t & res_string_offsets = typeid_cast<ColumnString &>(res_.getData()).getOffsets();
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Offsets_t & res_offsets = res_.getOffsets();
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res_chars.reserve(cur_chars.size() / col_size * replicate_offsets.back());
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res_string_offsets.reserve(cur_string_offsets.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_cur_offset = 0;
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Offset_t prev_cur_string_offset = 0;
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Offset_t current_res_offset = 0;
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Offset_t current_res_string_offset = 0;
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for (size_t i = 0; i < col_size; ++i)
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{
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/// Насколько размножить массив.
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size_t size_to_replicate = replicate_offsets[i] - prev_replicate_offset;
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/// Количество строк в массиве.
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size_t value_size = cur_offsets[i] - prev_cur_offset;
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size_t sum_chars_size = 0;
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for (size_t j = 0; j < size_to_replicate; ++j)
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{
|
||
current_res_offset += value_size;
|
||
res_offsets.push_back(current_res_offset);
|
||
|
||
sum_chars_size = 0;
|
||
|
||
size_t prev_cur_string_offset_local = prev_cur_string_offset;
|
||
for (size_t k = 0; k < value_size; ++k)
|
||
{
|
||
/// Размер одной строки.
|
||
size_t chars_size = cur_string_offsets[k + prev_cur_offset] - prev_cur_string_offset_local;
|
||
|
||
current_res_string_offset += chars_size;
|
||
res_string_offsets.push_back(current_res_string_offset);
|
||
|
||
/// Копирование символов одной строки.
|
||
res_chars.resize(res_chars.size() + chars_size);
|
||
memcpy(&res_chars[res_chars.size() - chars_size], &cur_chars[prev_cur_string_offset_local], chars_size);
|
||
|
||
sum_chars_size += chars_size;
|
||
prev_cur_string_offset_local += chars_size;
|
||
}
|
||
}
|
||
|
||
prev_replicate_offset = replicate_offsets[i];
|
||
prev_cur_offset = cur_offsets[i];
|
||
prev_cur_string_offset += sum_chars_size;
|
||
}
|
||
|
||
return res;
|
||
}
|
||
};
|
||
|
||
|
||
}
|