Kedar Potdar <kedar.potdar@gmail.com> writes:
> The problem here is I need to store values of different types into bytearray
> column of relation.
Perhaps you should study the ANALYZE code. AFAICS your requirements are
not different from those of the pg_statistic data store. You should do
things the same way they are done there, if only to reduce the surprise
factor for readers of the code.
regards, tom lane