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#pragma once
#include "column.h"
#include "numeric.h"
namespace NClickHouse {
/**
* Represents column of Nullable(T).
*/
class TColumnNullable: public TColumn {
public:
static TIntrusivePtr<TColumnNullable> Create(TColumnRef nested);
static TIntrusivePtr<TColumnNullable> Create(TColumnRef nested, TColumnRef nulls);
/// Returns null flag at given row number.
bool IsNull(size_t n) const;
/// Returns nested column.
TColumnRef Nested() const;
public:
/// Appends content of given column to the end of current one.
void Append(TColumnRef column) override;
/// Loads column data from input stream.
bool Load(TCodedInputStream* input, size_t rows) override;
/// Saves column data to output stream.
void Save(TCodedOutputStream* output) override;
/// Returns count of rows in the column.
size_t Size() const override;
/// Makes slice of the current column.
TColumnRef Slice(size_t begin, size_t len) override;
private:
TColumnNullable(TColumnRef nested, TColumnRef nulls);
TColumnRef Nested_;
TIntrusivePtr<TColumnUInt8> Nulls_;
};
}
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