BUG #5316: not handled error in inherit queries

The following bug has been logged online:

Bug reference:      5316
Logged by:          Gianfranco Frau
Email address:      frau@crs4.it
PostgreSQL version: 8.2.11
Operating system:   Ubuntu
Description:        not handled error in inherit queries
Details:

if you make this query:

SELECT * from first_table where one in (SELECT one from second_table);

and "second_table" don't have an "one" column, no errors are reported, but
seems that the internal query returns a empty set.
If you do:

SELECT one from second_table;

the error is correctly reported.