ClickHouse/dbms/include/DB/Columns/ColumnTuple.h

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#pragma once
#include <DB/Core/Block.h>
#include <ext/map.hpp>
#include <ext/range.hpp>
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namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
extern const int CANNOT_INSERT_VALUE_OF_DIFFERENT_SIZE_INTO_TUPLE;
}
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/** Столбец, который всего лишь группирует вместе несколько других столбцов.
*/
class ColumnTuple final : public IColumn
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{
private:
Block data;
Columns columns;
public:
ColumnTuple() {}
ColumnTuple(Block data_) : data(data_)
{
size_t size = data.columns();
columns.resize(size);
for (size_t i = 0; i < size; ++i)
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columns[i] = data.unsafeGetByPosition(i).column;
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}
std::string getName() const override { return "Tuple"; }
SharedPtr<IColumn> cloneEmpty() const override
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{
return new ColumnTuple(data.cloneEmpty());
}
size_t size() const override
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{
return data.rows();
}
Field operator[](size_t n) const override
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{
return Tuple{ext::map<TupleBackend>(columns, [n] (const auto & column) { return (*column)[n]; })};
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}
void get(size_t n, Field & res) const override
{
const size_t size = columns.size();
res = Tuple(TupleBackend(size));
TupleBackend & res_arr = DB::get<Tuple &>(res).t;
for (const auto i : ext::range(0, size))
columns[i]->get(n, res_arr[i]);
}
StringRef getDataAt(size_t n) const override
{
throw Exception("Method getDataAt is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
}
void insertData(const char * pos, size_t length) override
{
throw Exception("Method insertData is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
}
void insert(const Field & x) override
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{
const TupleBackend & tuple = DB::get<const Tuple &>(x).t;
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const size_t size = columns.size();
if (tuple.size() != size)
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throw Exception("Cannot insert value of different size into tuple", ErrorCodes::CANNOT_INSERT_VALUE_OF_DIFFERENT_SIZE_INTO_TUPLE);
for (size_t i = 0; i < size; ++i)
columns[i]->insert(tuple[i]);
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}
void insertFrom(const IColumn & src_, size_t n) override
{
const ColumnTuple & src = static_cast<const ColumnTuple &>(src_);
size_t size = columns.size();
if (src.columns.size() != size)
throw Exception("Cannot insert value of different size into tuple", ErrorCodes::CANNOT_INSERT_VALUE_OF_DIFFERENT_SIZE_INTO_TUPLE);
for (size_t i = 0; i < size; ++i)
columns[i]->insertFrom(*src.columns[i], n);
}
void insertDefault() override
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{
for (auto & column : columns)
column->insertDefault();
}
void popBack(size_t n) override
{
for (auto & column : columns)
column->popBack(n);
}
StringRef serializeValueIntoArena(size_t n, Arena & arena, char const *& begin) const override
{
size_t values_size = 0;
for (auto & column : columns)
values_size += column->serializeValueIntoArena(n, arena, begin).size;
return StringRef(begin, values_size);
}
const char * deserializeAndInsertFromArena(const char * pos) override
{
for (auto & column : columns)
pos = column->deserializeAndInsertFromArena(pos);
return pos;
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}
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void insertRangeFrom(const IColumn & src, size_t start, size_t length) override
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{
for (size_t i = 0; i < columns.size(); ++i)
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data.unsafeGetByPosition(i).column->insertRangeFrom(
*static_cast<const ColumnTuple &>(src).data.unsafeGetByPosition(i).column.get(),
start, length);
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}
ColumnPtr filter(const Filter & filt, ssize_t result_size_hint) const override
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{
Block res_block = data.cloneEmpty();
for (size_t i = 0; i < columns.size(); ++i)
res_block.unsafeGetByPosition(i).column = data.unsafeGetByPosition(i).column->filter(filt, result_size_hint);
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return new ColumnTuple(res_block);
}
ColumnPtr permute(const Permutation & perm, size_t limit) const override
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{
Block res_block = data.cloneEmpty();
for (size_t i = 0; i < columns.size(); ++i)
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res_block.unsafeGetByPosition(i).column = data.unsafeGetByPosition(i).column->permute(perm, limit);
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return new ColumnTuple(res_block);
}
ColumnPtr replicate(const Offsets_t & offsets) const override
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{
Block res_block = data.cloneEmpty();
for (size_t i = 0; i < columns.size(); ++i)
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res_block.unsafeGetByPosition(i).column = data.unsafeGetByPosition(i).column->replicate(offsets);
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return new ColumnTuple(res_block);
}
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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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{
size_t size = columns.size();
for (size_t i = 0; i < size; ++i)
if (int res = columns[i]->compareAt(n, m, *static_cast<const ColumnTuple &>(rhs).columns[i], nan_direction_hint))
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return res;
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return 0;
}
template <bool positive>
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struct Less
{
ConstColumnPlainPtrs plain_columns;
Less(const Columns & columns)
{
for (const auto & column : columns)
plain_columns.push_back(column.get());
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}
bool operator() (size_t a, size_t b) const
{
for (ConstColumnPlainPtrs::const_iterator it = plain_columns.begin(); it != plain_columns.end(); ++it)
{
int res = (*it)->compareAt(a, b, **it, positive ? 1 : -1);
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if (res < 0)
return positive;
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else if (res > 0)
return !positive;
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}
return false;
}
};
void getPermutation(bool reverse, size_t limit, Permutation & res) const override
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{
size_t rows = size();
res.resize(rows);
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for (size_t i = 0; i < rows; ++i)
res[i] = i;
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if (limit >= rows)
limit = 0;
if (limit)
{
if (reverse)
std::partial_sort(res.begin(), res.begin() + limit, res.end(), Less<false>(columns));
else
std::partial_sort(res.begin(), res.begin() + limit, res.end(), Less<true>(columns));
}
else
{
if (reverse)
std::sort(res.begin(), res.end(), Less<false>(columns));
else
std::sort(res.begin(), res.end(), Less<true>(columns));
}
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}
void reserve(size_t n) override
{
for (auto & column : columns)
column->reserve(n);
}
size_t byteSize() const override
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{
size_t res = 0;
for (const auto & column : columns)
res += column->byteSize();
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return res;
}
void getExtremes(Field & min, Field & max) const override
{
const size_t tuple_size = columns.size();
min = Tuple(TupleBackend(tuple_size));
max = Tuple(TupleBackend(tuple_size));
auto & min_backend = min.get<Tuple &>().t;
auto & max_backend = max.get<Tuple &>().t;
for (const auto i : ext::range(0, tuple_size))
columns[i]->getExtremes(min_backend[i], max_backend[i]);
}
ColumnPtr convertToFullColumnIfConst() const override
{
Block materialized = data;
for (size_t i = 0, size = materialized.columns(); i < size; ++i)
if (auto converted = materialized.unsafeGetByPosition(i).column->convertToFullColumnIfConst())
materialized.unsafeGetByPosition(i).column = converted;
return new ColumnTuple(materialized);
}
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const Block & getData() const { return data; }
Block & getData() { return data; }
const Columns & getColumns() const { return columns; }
Columns & getColumns() { return columns; }
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};
}