Reading view emit a audit log as UNKNOWN

[MasahikoSawada]

While testing I noticed that pgaudit emits a UNKNOWN type log when reading view. This behavior seems same as what advanced branch doing.

• In advanced branch (with format 'HOGE : user = %user, class = %class,tag = %command_tag, type = %object_type, text = %command_text')

LOG:  HOGE : user = masahiko, class = READ MISC MISC, tag = SELECT UNKNOWN SELECT, type = VIEW VIEW TABLE, text = select * from hoge_view;

• In refactored branch

NOTICE:  AUDIT: SESSION,1,1,READ,2017-02-13 20:06:52 JST,postgres,masahiko,[local],psql,2/30,0,,,SELECT,VIEW,public.hoge_view,select * from hoge_view;,<not logged>
NOTICE:  AUDIT: SESSION,1,1,MISC,2017-02-13 20:12:28 JST,postgres,masahiko,[local],psql,2/30,0,,,UNKNOWN,VIEW,public.hoge_view,select * from hoge_view;,<not logged>
NOTICE:  AUDIT: SESSION,1,1,READ,2017-02-13 20:12:28 JST,postgres,masahiko,[local],psql,2/30,0,,,SELECT,TABLE,public.hoge,select * from hoge_view;,<not logged>

This cause is that old and new column are added when rewriting query. So these SELECT, UNKNOWN and SELECT are corresponding to old column, new column and the table. I understand the cause of this but I'm not sure how we can fix it. Issued to not forget it.