SQL Server Native Client (SNAC) is not supported beyond SQL Server 2012. Avoid using SNAC in new development work, and plan to modify applications that currently use it. The Microsoft ODBC Driver for SQL Server provides native connectivity from Windows to Microsoft SQL Server and Microsoft Azure SQL Database.
SQL Server Native Client adds the DBCOLUMN_BASETABLEINSTANCE column to IColumnsRowset::GetColumnRowset. This column returns DBTYPE_I2 and is reserved for use by Microsoft. The information in this column is subject to change in future releases.