Re: [HACKERS] Warning!! - Mailing list pgsql-hackers

From Bruce Momjian
Subject Re: [HACKERS] Warning!!
Date
Msg-id 199811041402.JAA09661@candle.pha.pa.us
Whole thread Raw
In response to Re: [HACKERS] Warning!!  ("Thomas G. Lockhart" <lockhart@alumni.caltech.edu>)
Responses Re: [HACKERS] Warning!!  (A James Lewis <james@vrtx.net>)
List pgsql-hackers
> > I'm very new to this list, and I have to first say that 6.4beta5 fixes
> > every problem I had encountered with 6.3.2 (A small list..)
> > Just now I saw and posted this...
> > If the pence is 0-4 it rounds down... surely that's a rounding bug 
> > because it should be looking at the next significant figure?
> 
> tgl=> select cash_mul_flt8('$123.77', '1');
> cash_mul_flt8
> -------------
> $123.77
> (1 row)
> 
> tgl=> select cash_mul_flt8('$1', '123.77');
> cash_mul_flt8
> -------------
> $123.76
> (1 row)
> 
> That's annoying; it's non-symmetric too. The money type is stored as an
> integer, and the float type is an IEEE double; looks like we have an LSB
> rounding problem. Not sure what to do about it other than remove the
> function, which isn't desirable I'm sure...

This is really bad.  I can't imagine a 5-digit double is loosing
rounding on a double.  There must be some other problem, but I can't
reproduce it here on BSD/OS.

--  Bruce Momjian                        |  http://www.op.net/~candle maillist@candle.pha.pa.us            |  (610)
853-3000+  If your life is a hard drive,     |  830 Blythe Avenue +  Christ can be your backup.        |  Drexel Hill,
Pennsylvania19026
 


pgsql-hackers by date:

Previous
From: Bruce Momjian
Date:
Subject: Re: [HACKERS] Mixing library versions
Next
From: Bruce Momjian
Date:
Subject: Re: [HACKERS] Warning!!