This SQL function corresponds to the ODBC catalog call of similar name.
    It is used to access the data dictionary of remote data sources inside the
    ATTACH TABLE process.The dsn argument must refer to a dsn previously defined by
    vd_remote_data_source or ATTACH TABLE.The qualifier argument corresponds to the szTableQualifier and
    cbTableQualifier arguments of an ODBC catalog function.  A SQL NULL value
    corresponds to the C NULL value.  The arguments can contain % signs, which
    are interpreted as in LIKE.These functions return an array, with one element for each row of the result set.
    Each row is represented as an array with one element for each column.