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doc: adjust PG 12 relnotes item on float digit adjustment

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Discussion: https://postgr.es/m/87y330d8ty.fsf@news-spur.riddles.org.uk
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Bruce Momjian 2019-05-21 16:31:02 -04:00
parent 0fca8285ea
commit b84a801d6a
1 changed files with 7 additions and 9 deletions
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16
doc/src/sgml/release-12.sgml
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@ -207,18 +207,16 @@ Author: Andrew Gierth <rhodiumtoad@postgresql.org>
--> -->
<para> <para>
Avoid performing unnecessary rounding of <link Improve performance by changing the default number of trailing digits
linkend="datatype-float"><type>REAL</type></link> and <type>DOUBLE output for <link linkend="datatype-float"><type>REAL</type></link>
PRECISION</type> values (Andrew Gierth) and <type>DOUBLE PRECISION</type> values (Andrew Gierth)
</para> </para>
<para> <para>
This dramatically speeds up processing of floating-point Previously, float values were output rounded to 6 or 15 decimals
values but causes additional trailing digits to by default. Now, only the number of digits required to preserve
potentially be displayed. Users wishing to have output the exact binary value is output. The previous behavior can be
that is rounded to match the previous behavior can set <link restored by setting <xref linkend="guc-extra-float-digits"/> to zero.
linkend="guc-extra-float-digits"><literal>extra_float_digits=0</literal></link>,
which is no longer the default.
</para> </para>
</listitem> </listitem>