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#pragma once
#include <Interpreters/PreparedSets.h>
#include <Columns/IColumnDummy.h>
#include <Core/Field.h>
namespace DB
{
class Set;
using ConstSetPtr = std::shared_ptr<const Set>;
/** A column containing multiple values in the `IN` section.
* Behaves like a constant-column (because the set is one, not its own for each line).
* This column has a nonstandard value, so it can not be obtained via a normal interface.
*/
class ColumnSet final : public COWHelper<IColumnDummy, ColumnSet>
{
private:
friend class COWHelper<IColumnDummy, ColumnSet>;
ColumnSet(size_t s_, FutureSetPtr data_) : data(std::move(data_)) { s = s_; }
ColumnSet(const ColumnSet &) = default;
public:
const char * getFamilyName() const override { return "Set"; }
TypeIndex getDataType() const override { return TypeIndex::Set; }
MutableColumnPtr cloneDummy(size_t s_) const override { return ColumnSet::create(s_, data); }
FutureSetPtr getData() const { return data; }
// Used only for debugging, making it DUMPABLE
Field operator[](size_t) const override { return {}; }
private:
FutureSetPtr data;
};
}
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