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Add a new GUC variable called "IntervalStyle" that decouples interval output

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from DateStyle, and create a new interval style that produces output matching
the SQL standard (at least for interval values that fall within the standard's
restrictions).  IntervalStyle is also used to resolve the conflict between the
standard and traditional Postgres rules for interpreting negative interval
input.

Ron Mayer
This commit is contained in:
Tom Lane
2008-11-09 00:28:35 +00:00
parent eec501c4f7
commit df7641e25a
18 changed files with 540 additions and 143 deletions
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8
doc/src/sgml/ref/copy.sgml
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@@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/copy.sgml,v 1.82 2008/10/10 21:46:34 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/copy.sgml,v 1.83 2008/11/09 00:28:34 tgl Exp $
PostgreSQL documentation
-->
@@ -349,7 +349,11 @@ COPY <replaceable class="parameter">count</replaceable>
<productname>PostgreSQL</productname> installations that might use
non-default <varname>DateStyle</varname> settings,
<varname>DateStyle</varname> should be set to <literal>ISO</> before
using <command>COPY TO</>.
using <command>COPY TO</>. It is also a good idea to avoid dumping
data with <varname>IntervalStyle</varname> set to
<literal>sql_standard</>, because negative interval values might be
misinterpreted by a server that has a different setting for
<varname>IntervalStyle</varname>.
</para>
<para>