strip comment like '/* i am comment */' 

sometimes the sql file is not dumped by pgsql , it may be exported by some database design tools (eg:er master or power designer) .
so it may contains some comment like  '/* i am comment */'.
if the sql is like this:
/* create table begin */
create table table_name(
    ...
);

the table will be 	ignored by pgdiff,so i add a check for this scene