Horton

Re: Ryu floating point output patch

Tom Lane <tgl@sss.pgh.pa.us>

View thread View on postgr.es
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Cc: Andrew Gierth <andrew@tao11.riddles.org.uk>, pgsql-hackers@postgresql.org, "David G. Johnston" <david.g.johnston@gmail.com>, Donald Dong <xdong@csumb.edu>, Andres Freund <andres@anarazel.de>, Robert Haas <robertmhaas@gmail.com>, Chapman Flack <chap@anastigmatix.net>
Date: 2019-02-17T23:04:22Z
Lists: pgsql-hackers 
Andrew Dunstan <andrew.dunstan@2ndquadrant.com> writes:
> Here's a patch without docco. How much do we actually want to document
> this? I'm not sure it has any great value outside of cross-version
> upgrade testing.

I think we have to document it, but it can be fairly terse perhaps.

	Use the specified value of extra_float_digits when dumping
	floating-point data, rather than pg_dump's default.

I don't think we need to go into detail about when/why you might want
to use it; I can see people thinking of their own reasons.

			regards, tom lane

Commits

  1. Provide an extra-float-digits setting for pg_dump / pg_dumpall

  2. Change floating-point output format for improved performance.

  3. Use strtof() and not strtod() for float4 input.