diff options
| author | Alvaro Herrera | 2013-07-02 16:21:16 +0000 |
|---|---|---|
| committer | Alvaro Herrera | 2013-07-02 17:14:02 +0000 |
| commit | e9ac1b8775c49a41374d85463f56aed73d512f25 (patch) | |
| tree | c82f6b33f3cf2be920b2777d21ed659786b0d566 /doc/src | |
| parent | 17abf275f070d17fbb8d8dff8f62373e2c6bf9fd (diff) | |
Mention extra_float_digits in floating point docs
Make it easier for readers of the FP docs to find out about possibly
truncated values.
Per complaint from Tom Duffey in message
F0E0F874-C86F-48D1-AA2A-0C5365BF5118@trillitech.com
Author: Albe Laurenz
Reviewed by: Abhijit Menon-Sen
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/config.sgml | 1 | ||||
| -rw-r--r-- | doc/src/sgml/datatype.sgml | 11 |
2 files changed, 12 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 1e575b26605..4791eb12400 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -4285,6 +4285,7 @@ SET XML OPTION { DOCUMENT | CONTENT }; partially-significant digits; this is especially useful for dumping float data that needs to be restored exactly. Or it can be set negative to suppress unwanted digits. + See also <xref linkend="datatype-float">. </para> </listitem> </varlistentry> diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml index b8dd8a5edce..4ea2b8a3662 100644 --- a/doc/src/sgml/datatype.sgml +++ b/doc/src/sgml/datatype.sgml @@ -663,6 +663,17 @@ NUMERIC from zero will cause an underflow error. </para> + <note> + <para> + The <xref linkend="guc-extra-float-digits"> setting controls the + number of extra significant digits included when a floating point + value is converted to text for output. With the default value of + <literal>0</literal>, the output is the same on every platform + supported by PostgreSQL. Increasing it will produce output that + more accurately represents the stored value, but may be unportable. + </para> + </note> + <indexterm> <primary>not a number</primary> <secondary>double precision</secondary> |