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95 lines
3.7 KiB
C++
95 lines
3.7 KiB
C++
#pragma once
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#include <Core/Block.h>
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namespace DB
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{
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/** Column, that is just group of few another columns.
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*
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* For constant Tuples, see ColumnConst.
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* Mixed constant/non-constant columns is prohibited in tuple
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* for implementation simplicity.
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*/
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class ColumnTuple final : public COWHelper<IColumn, ColumnTuple>
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{
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private:
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friend class COWHelper<IColumn, ColumnTuple>;
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using TupleColumns = std::vector<WrappedPtr>;
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TupleColumns columns;
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template <bool positive>
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struct Less;
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explicit ColumnTuple(MutableColumns && columns);
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ColumnTuple(const ColumnTuple &) = default;
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public:
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/** Create immutable column using immutable arguments. This arguments may be shared with other columns.
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* Use IColumn::mutate in order to make mutable column and mutate shared nested columns.
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*/
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using Base = COWHelper<IColumn, ColumnTuple>;
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static Ptr create(const Columns & columns);
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static Ptr create(const TupleColumns & columns);
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static Ptr create(Columns && arg) { return create(arg); }
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template <typename Arg, typename = typename std::enable_if<std::is_rvalue_reference<Arg &&>::value>::type>
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static MutablePtr create(Arg && arg) { return Base::create(std::forward<Arg>(arg)); }
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std::string getName() const override;
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const char * getFamilyName() const override { return "Tuple"; }
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MutableColumnPtr cloneEmpty() const override;
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MutableColumnPtr cloneResized(size_t size) const override;
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size_t size() const override
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{
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return columns.at(0)->size();
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}
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Field operator[](size_t n) const override;
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void get(size_t n, Field & res) const override;
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StringRef getDataAt(size_t n) const override;
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void insertData(const char * pos, size_t length) override;
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void insert(const Field & x) override;
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void insertFrom(const IColumn & src_, size_t n) override;
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void insertDefault() override;
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void popBack(size_t n) override;
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StringRef serializeValueIntoArena(size_t n, Arena & arena, char const *& begin) const override;
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const char * deserializeAndInsertFromArena(const char * pos) override;
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void updateHashWithValue(size_t n, SipHash & hash) const override;
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void updateWeakHash32(WeakHash32 & hash) const override;
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void insertRangeFrom(const IColumn & src, size_t start, size_t length) override;
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ColumnPtr filter(const Filter & filt, ssize_t result_size_hint) const override;
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ColumnPtr permute(const Permutation & perm, size_t limit) const override;
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ColumnPtr index(const IColumn & indexes, size_t limit) const override;
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ColumnPtr replicate(const Offsets & offsets) const override;
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MutableColumns scatter(ColumnIndex num_columns, const Selector & selector) const override;
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void gather(ColumnGathererStream & gatherer_stream) override;
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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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void getExtremes(Field & min, Field & max) const override;
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void getPermutation(bool reverse, size_t limit, int nan_direction_hint, Permutation & res) const override;
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void reserve(size_t n) override;
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size_t byteSize() const override;
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size_t allocatedBytes() const override;
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void protect() override;
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void forEachSubcolumn(ColumnCallback callback) override;
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bool structureEquals(const IColumn & rhs) const override;
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size_t tupleSize() const { return columns.size(); }
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const IColumn & getColumn(size_t idx) const { return *columns[idx]; }
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IColumn & getColumn(size_t idx) { return *columns[idx]; }
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const TupleColumns & getColumns() const { return columns; }
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Columns getColumnsCopy() const { return {columns.begin(), columns.end()}; }
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const ColumnPtr & getColumnPtr(size_t idx) const { return columns[idx]; }
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};
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}
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