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46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
#pragma once
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#include <DB/Columns/IColumn.h>
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namespace DB
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{
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class ColumnNull final : public IColumn
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{
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public:
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ColumnNull() = default;
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ColumnNull(size_t size);
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std::string getName() const override;
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bool isConst() const override;
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ColumnPtr convertToFullColumnIfConst() const override;
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size_t sizeOfField() const override;
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ColumnPtr cloneResized(size_t size) const override;
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size_t size() const override;
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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 insert(const Field & x) override;
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void insertRangeFrom(const IColumn & src, size_t start, size_t length) override;
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void insertData(const char * pos, size_t length) 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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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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int compareAt(size_t n, size_t m, const IColumn & rhs, int nan_direction_hint) const override;
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void getPermutation(bool reverse, size_t limit, Permutation & res) const override;
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ColumnPtr replicate(const Offsets_t & offsets) const override;
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size_t byteSize() const override;
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void updateHashWithValue(size_t n, SipHash & hash) const override;
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private:
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void getExtremesImpl(Field & min, Field & max, const NullValuesByteMap * null_map_) const override;
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private:
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size_t count = 0;
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};
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}
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