In versions prior to Version 2.1, DB2 CLI returned a set of bitmasks for the fInfoTypes which started with SQL_CONVERT_ (for example, SQL_CONVERT_INTEGER). fInfoTypes which where used with corresponding comparison bitmasks which started with SQL_CVT_ (for example, SQL_CVT_CHAR).
Since this fInfoType is defined by ODBC to indicate supported conversion functions, and these functions are not supported, DB2 CLI Version 2.1 now (correctly) returns zero for all SQL_CONVERT fInfoTypes.