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Improve release notes' description of Teodor's fixes for polygon overlaps

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and contains operators.
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Tom Lane 2010-09-01 15:14:48 +00:00
parent 9602630f40
commit 41c8287de0
1 changed files with 14 additions and 3 deletions
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17
doc/src/sgml/release-9.0.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.39.2.11 2010/08/25 19:41:51 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.39.2.12 2010/09/01 15:14:48 tgl Exp $ -->
<sect1 id="release-9-0">
<title>Release 9.0</title>
@ -1698,8 +1698,19 @@
<listitem>
<para>
Correct calculations of <link
linkend="functions-geometry-op-table"><quote>overlap</quote></link>
and <quote>contains</quote> operations over polygons (Teodor Sigaev)
linkend="functions-geometry-op-table"><quote>overlaps</quote></link>
and <quote>contains</quote> operations for polygons (Teodor Sigaev)
</para>
<para>
The polygon <literal>&amp;&amp;</> (overlaps) operator formerly just
checked to see if the two polygons' bounding boxes overlapped. It now
does a more correct check. The polygon <literal>@&gt;</> and
<literal>&lt;@</> (contains/contained by) operators formerly checked
to see if one polygon's vertexes were all contained in the other;
this can wrongly report <quote>true</> for some non-convex polygons.
Now they check that all line segments of one polygon are contained in
the other.
</para>
</listitem>