BUG #5633: an empty row with null-like values in not-null field

The following bug has been logged online:

Bug reference:      5633
Logged by:          tkim
Email address:      kth999@gmail.com
PostgreSQL version: 9.0 beta 4
Operating system:   windows 7 professional
Description:        an empty row with null-like values in not-null field
Details:

After inserting a lot of data into a partitioned table, i found a weird
thing. When I query the table, i can see an empty row with null-like values
in 'not-null' fields.

To show you guys the captured image, i think it's good to link my question
on StackOverflow website.

http://stackoverflow.com/questions/3597000/postgresql-9-0-an-empty-row-with-
null-like-values-in-not-null-field

thnx.