mysql and oracle issue using dblink

Question

My issue is between mysql and oracle communication:

Step 1 (Creating a view in mysql for corresponding table)

E.g:

  CREATE VIEW piwik_log_link_view ( idvis, cusk )
  AS SELECT CAST( CONV( HEX( idvisitor ), 16, 10 ) AS CHAR(1000) )
          , custom_var_k1
     FROM   piwik_log_link_visit_action

Step 2: (Firing a query from Oracle through dblink)

E.g:

SELECT plv."idvis"
     , plv."cusk" 
FROM   "piwik_log_link_view"@mysql_piwik plv

Result:

Showing error: ORA-00904: "PLV"."cusk": invalid identifier.

If change step 2 to fetch only one column

I.E.

SELECT plv."idvis"
FROM "piwik_log_link_view"@mysql_piwik plv

Result :

Showing the first column.. .

Incase of putting * also in select query shows only one column.