Update to table comments

[kadrlica]

There is something strange happening for me when I try to add comments to a table column:

~> create table tmp_table2 ( col Integer) ;
~> add_comment column tmp_table2.col 'This '
<class 'cx_Oracle.DatabaseError'>
ORA-00942: table or view does not exist

However, this appears to work with:

~> create table tmp ( col Integer) ;
~> add_comment column tmp.col 'This '
Comment added to column: col in table tmp

Also, I think there might be an issue with creating comments on tables specified with usernames (unconfirmed).