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#pragma once
#include <Columns/ColumnNullable.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);
}
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