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Extend the date type to support infinity and -infinity, analogously to

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the timestamp types.  Turns out this doesn't even reduce the available
range of dates, since the restriction to dates that work for Julian-date
arithmetic is much tighter than the int32 range anyway.  Per a longstanding
TODO item.
This commit is contained in:
Tom Lane
2008-10-14 17:12:33 +00:00
parent 791359fe0e
commit a303e4dc43
9 changed files with 206 additions and 65 deletions
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6
doc/src/sgml/datatype.sgml
View File

@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.229 2008/10/03 15:37:18 petere Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.230 2008/10/14 17:12:32 tgl Exp $ -->
<chapter id="datatype">
<title id="datatype-title">Data Types</title>
@@ -2032,12 +2032,12 @@ January 8 04:05:06 1999 PST
</row>
<row>
<entry><literal>infinity</literal></entry>
<entry><type>timestamp</type></entry>
<entry><type>date</type>, <type>timestamp</type></entry>
<entry>later than all other time stamps</entry>
</row>
<row>
<entry><literal>-infinity</literal></entry>
<entry><type>timestamp</type></entry>
<entry><type>date</type>, <type>timestamp</type></entry>
<entry>earlier than all other time stamps</entry>
</row>
<row>

12
doc/src/sgml/func.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.449 2008/10/13 16:25:19 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.450 2008/10/14 17:12:32 tgl Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@@ -5912,10 +5912,18 @@ SELECT SUBSTRING('XY1234Z', 'Y*?([0-9]{1,3})');
<entry><literal>3</literal></entry>
</row>
<row>
<entry><literal><function>isfinite</function>(<type>date</type>)</literal></entry>
<entry><type>boolean</type></entry>
<entry>Test for finite date (not +/-infinity)</entry>
<entry><literal>isfinite(date '2001-02-16')</literal></entry>
<entry><literal>true</literal></entry>
</row>
<row>
<entry><literal><function>isfinite</function>(<type>timestamp</type>)</literal></entry>
<entry><type>boolean</type></entry>
<entry>Test for finite time stamp (not equal to infinity)</entry>
<entry>Test for finite time stamp (not +/-infinity)</entry>
<entry><literal>isfinite(timestamp '2001-02-16 21:28:30')</literal></entry>
<entry><literal>true</literal></entry>
</row>