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De-support floating-point timestamps.

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Per discussion, the time has come to do this.  The handwriting has been
on the wall at least since 9.0 that this would happen someday, whenever
it got to be too much of a burden to support the float-timestamp option.
The triggering factor now is the discovery that there are multiple bugs
in the code that attempts to implement use of integer timestamps in the
replication protocol even when the server is built for float timestamps.
The internal float timestamps leak into the protocol fields in places.
While we could fix the identified bugs, there's a very high risk of
introducing more.  Trying to build a wall that would positively prevent
mixing integer and float timestamps is more complexity than we want to
undertake to maintain a long-deprecated option.  The fact that these
bugs weren't found through testing also indicates a lack of interest
in float timestamps.

This commit disables configure's --disable-integer-datetimes switch
(it'll still accept --enable-integer-datetimes, though), removes direct
references to USE_INTEGER_DATETIMES, and removes discussion of float
timestamps from the user documentation.  A considerable amount of code is
rendered dead by this, but removing that will occur as separate mop-up.

Discussion: https://postgr.es/m/26788.1487455319@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2017-02-23 11:40:12 -05:00
parent c3368f9173
commit b6aa17e0ae
15 changed files with 36 additions and 124 deletions
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22
doc/src/sgml/installation.sgml
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@ -955,28 +955,6 @@ su - postgres
</listitem>
</varlistentry>
<varlistentry>
<term><option>--disable-integer-datetimes</option></term>
<listitem>
<para>
Disable support for 64-bit integer storage for timestamps and
intervals, and store datetime values as floating-point
numbers instead. Floating-point datetime storage was the
default in <productname>PostgreSQL</productname> releases
prior to 8.4, but it is now deprecated, because it does not
support microsecond precision for the full range of
<type>timestamp</type> values. However, integer-based
datetime storage requires a 64-bit integer type. Therefore,
this option can be used when no such type is available, or
for compatibility with applications written for prior
versions of <productname>PostgreSQL</productname>. See
<![%standalone-include[the documentation about datetime datatypes]]>
<![%standalone-ignore[<xref linkend="datatype-datetime">]]>
for more information.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--disable-float4-byval</option></term>
<listitem>