BUG #6463: tables can have at most 1600 columns

The following bug has been logged on the website:

Bug reference:      6463
Logged by:          khalil alijani
Email address:      khalil.alijani@gmail.com
PostgreSQL version: 8.4.10
Operating system:   ubuntu
Description:=20=20=20=20=20=20=20=20

I drop a column but Postgresql still shows old (deleted) columns...

My Java program does this:
drop a boolean column and then add same column (with same name and
specification), in dozens times, because updating (this) column is very slow
!!!
AND finally it says "tables can have at most 1600 columns"

thank ...