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

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#pragma once
#include <DB/Columns/IColumnDummy.h>
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namespace DB
{
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class Set;
using ConstSetPtr = std::shared_ptr<const Set>;
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/** Столбец, содержащий множество значений в секции IN.
* Ведёт себя как столбец-константа (так как множество одно, а не своё на каждую строку).
* Значение у этого столбца нестандартное, поэтому его невозможно получить через обычный интерфейс.
*/
class ColumnSet final : public IColumnDummy
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{
public:
ColumnSet(size_t s_, ConstSetPtr data_) : IColumnDummy(s_), data(data_) {}
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/// Столбец не константный. Иначе столбец будет использоваться в вычислениях в ExpressionActions::prepare, когда множество из подзапроса ещё не готово.
bool isConst() const override { return false; }
std::string getName() const override { return "ColumnSet"; }
ColumnPtr cloneDummy(size_t s_) const override { return std::make_shared<ColumnSet>(s_, data); }
ConstSetPtr getData() const { return data; }
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private:
ConstSetPtr data;
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};
}