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NullableUtils.h
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27 lines (19 loc) · 868 Bytes
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#pragma once
#include <Columns/ColumnNullable.h>
#include <DataTypes/Serializations/ISerialization.h>
namespace DB
{
/** Replace Nullable key_columns to corresponding nested columns.
* In 'null_map' return a map of positions where at least one column was NULL.
* @returns ownership column of null_map.
*/
ColumnPtr extractNestedColumnsAndNullMap(ColumnRawPtrs & key_columns, ConstNullMapPtr & null_map);
struct NullableSubcolumnCreator : public ISerialization::ISubcolumnCreator
{
const ColumnPtr null_map;
explicit NullableSubcolumnCreator(const ColumnPtr & null_map_) : null_map(null_map_) {}
DataTypePtr create(const DataTypePtr & prev) const override;
SerializationPtr create(const SerializationPtr & prev_serialization, const DataTypePtr & prev_type) const override;
ColumnPtr create(const ColumnPtr & prev) const override;
};
}