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Improve a couple of 9.2 release note entries.

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Clarify the compatibility notes about EXTRACT() and about statistics
timing columns.
This commit is contained in:
Tom Lane 2012-08-27 20:54:00 -04:00
parent 60888e232f
commit a63b7744fa
1 changed files with 22 additions and 15 deletions
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37
doc/src/sgml/release-9.2.sgml
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@ -196,7 +196,8 @@
</para>
<para>
Without this it is possible to output invalid <acronym>XML</acronym>.
Without this it is possible for the result not to be valid
<acronym>XML</acronym>.
</para>
</listitem>
@ -216,15 +217,20 @@
<listitem>
<para>
Make <link
linkend="functions-datetime-extract"><function>EXTRACT</></link> of
a non-timezone-aware value measure the epoch from local midnight,
not <acronym>UTC</acronym> midnight (Tom Lane)
linkend="functions-datetime-extract"><function>EXTRACT(EPOCH FROM
<replaceable>timestamp without time zone</>)</function></link>
measure the epoch from local midnight, not <acronym>UTC</acronym>
midnight (Tom Lane)
</para>
<para>
Having these computations depend on <acronym>UTC</acronym>
was inconsistent. The old behavior is available by casting the
value to timestamp with time zone.
This change reverts an ill-considered change made in release 7.3.
Measuring from <acronym>UTC</acronym> midnight was inconsistent
because it made the result dependent on the <link
linkend="guc-timezone"><varname>timezone</></link> setting, which
computations for <type>timestamp without time zone</> should not be.
The previous behavior remains available by casting the input value
to <type>timestamp with time zone</>.
</para>
</listitem>
@ -462,20 +468,21 @@
</para>
<para>
This change eliminates the designed-in assumption that the values
are accurate to microseconds and no more (since the <type>float8</>
values can be fractional).
The columns affected are
<structname>pg_stat_user_functions</>.<structfield>total_time</>,
<structname>pg_stat_user_functions</>.<structfield>self_time</>,
<structname>pg_stat_xact_user_functions</>.<structfield>total_time</>,
and
<structname>pg_stat_xact_user_functions</>.<structfield>self_time</>.
</para>
</listitem>
<listitem>
<para>
Change <application>pg_stat_statements</>'
<structfield>total_time</> column to be measured in milliseconds
(Tom Lane)
The statistics functions underlying these columns now also return
<type>float8</> milliseconds, rather than <type>bigint</>
microseconds.
<filename>contrib/pg_stat_statements</>'
<structfield>total_time</> column is now also measured in
milliseconds.
</para>
</listitem>