Alter Table Bug

Your name : Sezai YILMAZ
Your email address : sezaiy(at)hacettepe(dot)edu(dot)tr

System Configuration
---------------------
Architecture (example: Intel Pentium) : intel Pentium II 350Mhz

Operating System (example: Linux 2.0.26 ELF) : Linux 2.0.36 ELF

PostgreSQL version (example: PostgreSQL-6.4.2): PostgreSQL-6.4.2

Compiler used (example: gcc 2.8.0) : gcc 2.7.2.3

Please enter a FULL description of your problem:
------------------------------------------------

I modified a table of a postgres database by using SQL command alter
table. My modification only consists of adding a new column which
type is char(20) to the existing table. After that, I began to update
that column by inserting string values to whole column:

update table1 set new_column='something';

After that I tried to select all records whose new_column field is set to
'something'.

select * from table1 where new_column='something';

And the error message produced by the postgres follows:

ERROR: RestrictionClauseSelectivity: bad value 2.456940

When I backup the database and drop and create the table1 with the
'new_column' there is no problem with selecting the records which match to
the search criteria.

FYI

Sezai YILMAZ
User Support Group,
Computer Center,
Hacettepe University

Voice: +90 312 2976200 - +90 312 2352500/1209
Fax : +90 312 2992088