ing a column comment.      *      * SQL Server does not support native column comments,      * therefore the extended properties functionality is used      * as a workaround to store them.      * The property name used to store column comments is "MS_Description"      * which provides compatibility with SQL Server Management Studio,      * as column comments are stored in the same property there when      * specifying a column's "Description" attribute.      *      * @param string $tableName  The quoted table name to which the column belongs.      * @param string $columnName The quoted column name to 