Re: [HACKERS] floating point representation

[Hiroshi Inoue]

Tom Lane wrote: > > Peter Eisentraut <[EMAIL PROTECTED]> writes: > > Actually, you're going to have to recode the float*in() functions, using > > scanf, and scanf's formats are not always equivalent to printf's. > > Further thought: one answer to this is to institute four SET variables, > two for output and two for input; perhaps FLOAT8_FORMAT, FLOAT8_IN_FORMAT, > and similarly for FLOAT4. The input formats would normally just be > "%lg" and "%g" but could be changed for special cases (like reading > table dumps prepared with %a output format). > >From the first I don't want to change the current default output format "%." #FLT_DIG "g" (REAL) "%." #DBL_DIG "g" (DOUBLE PRECISION) for 7.1 because their changes would cause a regress test failure. > However, it's becoming quite clear to me that this feature needs more > thought than first appeared. Accordingly, I now vote that we not try > to fit it into 7.1, but do it in a more considered fashion for 7.2. > The simplest way to fix it quickly would be to not provide XXXX_IN_FORMAT and restrict XXXX_FORMAT to "%.*g" at present. Regards, Hiroshi Inoue