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Remove CTimeZone/HasCTZSet, root and branch.

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These variables no longer have any useful purpose, since there's no reason
to special-case brute force timezones now that we have a valid
session_timezone setting for them.  Remove the variables, and remove the
SET/SHOW TIME ZONE code that deals with them.

The user-visible impact of this is that SHOW TIME ZONE will now show a
POSIX-style zone specification, in the form "<+-offset>-+offset", rather
than an interval value when a brute-force zone has been set.  While perhaps
less intuitive, this is a better definition than before because it's
actually possible to give that string back to SET TIME ZONE and get the
same behavior, unlike what used to happen.

We did not previously mention the angle-bracket syntax when describing
POSIX timezone specifications; add some documentation so that people
can figure out what these strings do.  (There's still quite a lot of
undocumented functionality there, but anybody who really cares can
go read the POSIX spec to find out about it.  In practice most people
seem to prefer Olsen-style city names anyway.)
This commit is contained in:
Tom Lane
2013-11-01 13:57:31 -04:00
parent 1c8a7f617f
commit 45f64f1bbf
6 changed files with 31 additions and 98 deletions
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7
doc/src/sgml/datatype.sgml
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@ -2419,8 +2419,11 @@ January 8 04:05:06 1999 PST
optional daylight-savings zone abbreviation, assumed to stand for one
hour ahead of the given offset. For example, if <literal>EST5EDT</>
were not already a recognized zone name, it would be accepted and would
be functionally equivalent to United States East Coast time. When a
daylight-savings zone name is present, it is assumed to be used
be functionally equivalent to United States East Coast time. In this
syntax, a zone abbreviation can be a string of letters, or an
arbitrary string surrounded by angle brackets (<literal>&lt;&gt;</>).
When a daylight-savings zone abbreviation is present,
it is assumed to be used
according to the same daylight-savings transition rules used in the
<literal>zoneinfo</> time zone database's <filename>posixrules</> entry.
In a standard <productname>PostgreSQL</productname> installation,

9
doc/src/sgml/ref/set.sgml
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@ -243,7 +243,16 @@ SELECT setseed(<replaceable>value</replaceable>);
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
Timezone settings given as numbers or intervals are internally
translated to POSIX timezone syntax. For example, after
<literal>SET TIME ZONE -7</>, <command>SHOW TIME ZONE</> would
report <literal>&lt;-07&gt;+07</>.
</para>
<para>
See <xref linkend="datatype-timezones"> for more information
about time zones.
</para>