RestrictionClauseSelectivity

DROP TABLE Players;
CREATE TABLE Players ( ReqWhen DATETIME );
ALTER TABLE Players ADD ReqCode TEXT;
ALTER TABLE Players ADD ReqName TEXT;
ALTER TABLE Players ADD ReqMail TEXT;
ALTER TABLE Players ADD ReqPlay TEXT;
ALTER TABLE Players ADD ReqFeed TEXT;
ALTER TABLE Players ADD ReqPend CHAR;
SELECT * FROM Players WHERE ReqCode = 'Test';

Always produces the following error message:

ERROR: RestrictionClauseSelectivity: bad value 2.451276

I'm on 6.4.2 I think. Whatever was on RedHat 6.0 CD.
How do I confirm version without the install files?

Frank Bax