First of all, wanna compliment you for this helpful tool!

I came into a (possibly?) minor bug when trying to parse an hql file containing column names with special characters "<" or ">" properly quoted like:
something<2% float
I found out this is due to "parser.pre_process_line" that insert spaces around "<" and ">" if "(" not in line.
Possible solution is not to insert spaces if "<" ">" are inbetween quotes.