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| author | Bruce Momjian <bruce@momjian.us> | 2019-05-21 16:31:02 -0400 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2019-05-21 16:31:02 -0400 |
| commit | b84a801d6a6737e6d84326b77d98b498402ecad0 (patch) | |
| tree | 3cff0f40d5b02b0ef0cc008da4c41f8f93c77709 | |
| parent | 0fca8285ea533fa669a372c91fdb42265dcf7435 (diff) | |
| download | postgresql-b84a801d6a6737e6d84326b77d98b498402ecad0.tar.gz postgresql-b84a801d6a6737e6d84326b77d98b498402ecad0.zip | |
doc: adjust PG 12 relnotes item on float digit adjustment
Discussion: https://postgr.es/m/87y330d8ty.fsf@news-spur.riddles.org.uk
| -rw-r--r-- | doc/src/sgml/release-12.sgml | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/doc/src/sgml/release-12.sgml b/doc/src/sgml/release-12.sgml index 8529c6a261e..51de9cac16c 100644 --- a/doc/src/sgml/release-12.sgml +++ b/doc/src/sgml/release-12.sgml @@ -207,18 +207,16 @@ Author: Andrew Gierth <rhodiumtoad@postgresql.org> --> <para> - Avoid performing unnecessary rounding of <link - linkend="datatype-float"><type>REAL</type></link> and <type>DOUBLE - PRECISION</type> values (Andrew Gierth) + Improve performance by changing the default number of trailing digits + output for <link linkend="datatype-float"><type>REAL</type></link> + and <type>DOUBLE PRECISION</type> values (Andrew Gierth) </para> <para> - This dramatically speeds up processing of floating-point - values but causes additional trailing digits to - potentially be displayed. Users wishing to have output - that is rounded to match the previous behavior can set <link - linkend="guc-extra-float-digits"><literal>extra_float_digits=0</literal></link>, - which is no longer the default. + Previously, float values were output rounded to 6 or 15 decimals + by default. Now, only the number of digits required to preserve + the exact binary value is output. The previous behavior can be + restored by setting <xref linkend="guc-extra-float-digits"/> to zero. </para> </listitem> |