Re: Ryu floating point output patch

>>>>> "Donald" == Donald Dong <xdong(at)csumb(dot)edu> writes:

Donald> I think the previous additional digits behavior still exist
Donald> in the latest patch. For example:

Donald> =# set extra_float_digits = 0;
Donald> SET
Donald> =# select float4in('1.123456789');
Donald> float4in
Donald> ----------
Donald> 1.12346
Donald> (1 row)

Donald> =# set extra_float_digits = 1;
Donald> SET
Donald> =# select float4in('1.123456789');
Donald> float4in
Donald> -----------
Donald> 1.1234568
Donald> (1 row)

Donald> The extra_float_digits is increased by 1, but two digits are
Donald> added.

That's intentional; this patch takes any value of extra_float_digits
greater than 0 to mean "generate the shortest precise output".

In practice setting extra_float_digits to 1 is rare to nonexistent;
almost all users of extra_float_digits set it to either 3 (to get
precise values), 2 (for historical reasons since we didn't allow more
than 2 in older versions), or less than 0 (to get rounded output for
more convenient display when precision is not required).

--
Andrew (irc:RhodiumToad)