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

#pragma once

#include <DB/Core/Block.h>


namespace DB
{

/** Column, that is just group of few another columns.
  *
  * For constant Tuples, see ColumnConstTuple.
  * Mixed constant/non-constant columns is prohibited in tuple
  *  for implementation simplicity.
  */
class ColumnTuple final : public IColumn
{
private:
	Block data;
	Columns columns;

	template <bool positive>
	struct Less;

public:
	ColumnTuple() {}
	ColumnTuple(Block data_);

	std::string getName() const override { return "Tuple"; }

	ColumnPtr cloneEmpty() const override;

	size_t size() const override
	{
		return data.rows();
	}

	Field operator[](size_t n) const override;
	void get(size_t n, Field & res) const override;

	StringRef getDataAt(size_t n) const override;
	void insertData(const char * pos, size_t length) override;
	void insert(const Field & x) override;
	void insertFrom(const IColumn & src_, size_t n) override;
	void insertDefault() override;
	void popBack(size_t n) override;
	StringRef serializeValueIntoArena(size_t n, Arena & arena, char const *& begin) const override;
	const char * deserializeAndInsertFromArena(const char * pos) override;
	void updateHashWithValue(size_t n, SipHash & hash) const override;
	void insertRangeFrom(const IColumn & src, size_t start, size_t length) override;
	ColumnPtr filter(const Filter & filt, ssize_t result_size_hint) const override;
	ColumnPtr permute(const Permutation & perm, size_t limit) const override;
	ColumnPtr replicate(const Offsets_t & offsets) const override;
	Columns scatter(ColumnIndex num_columns, const Selector & selector) const override;
	int compareAt(size_t n, size_t m, const IColumn & rhs, int nan_direction_hint) const override;
	void getExtremes(Field & min, Field & max) const override;
	void getPermutation(bool reverse, size_t limit, int nan_direction_hint, Permutation & res) const override;
	void reserve(size_t n) override;
	size_t byteSize() const override;
	size_t allocatedSize() const override;
	ColumnPtr convertToFullColumnIfConst() const override;

	const Block & getData() const { return data; }
	Block & getData() { return data; }

	const Columns & getColumns() const { return columns; }
	Columns & getColumns() { return columns; }
};


}