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Increase the maximum value of extra_float_digits to 3, and have pg_dump

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use that value when the backend is new enough to allow it.  This responds
to bug report from Keh-Cheng Chu pointing out that although 2 extra digits
should be sufficient to dump and restore float8 exactly, it is possible to
need 3 extra digits for float4 values.
This commit is contained in:
Tom Lane
2009-09-11 19:17:04 +00:00
parent 680bf3268c
commit 8c5463a511
6 changed files with 15 additions and 13 deletions
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4
doc/src/sgml/config.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.226 2009/09/10 15:02:46 alvherre Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.227 2009/09/11 19:17:03 tgl Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@ -4291,7 +4291,7 @@ SET XML OPTION { DOCUMENT | CONTENT };
floating-point values, including <type>float4</>, <type>float8</>,
and geometric data types. The parameter value is added to the
standard number of digits (<literal>FLT_DIG</> or <literal>DBL_DIG</>
as appropriate). The value can be set as high as 2, to include
as appropriate). The value can be set as high as 3, to include
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.