From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Konrad Garus <konrad(dot)garus(at)gmail(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: BUG #5889: "Intersects" for polygons broken |
Date: | 2011-03-08 19:41:03 |
Message-ID: | AANLkTiky2PnaR7pkP0mAoO=sAaGmu59LcORur6D6x5mq@mail.gmail.com |
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On Wed, Feb 16, 2011 at 10:33 AM, Konrad Garus <konrad(dot)garus(at)gmail(dot)com> wrote:
> 2011/2/16 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
>> "Konrad Garus" <konrad(dot)garus(at)gmail(dot)com> writes:
>>> && operator seems to be broken for polygons whose bounding boxes intersect:
>>
>>> select polygon'((0,0), (1,2), (0,2))' && polygon'((0.5, 0), (1,0), (1,1))';
>>> ?column?
>>> ----------
>>> t
>>> (1 row)
>>
>> This is fixed as of 9.0; see the release notes at
>> http://www.postgresql.org/docs/9.0/static/release-9-0.html
>> which say
>>
>> Correct calculations of "overlaps" and "contains" operations for polygons (Teodor Sigaev)
>>
>> The polygon && (overlaps) operator formerly just checked to see
>> if the two polygons' bounding boxes overlapped. It now does a
>> more correct check. The polygon @> and <@ (contains/contained
>> by) operators formerly checked to see if one polygon's vertexes
>> were all contained in the other; this can wrongly report "true"
>> for some non-convex polygons. Now they check that all line
>> segments of one polygon are contained in the other.
>
> Thank you. How about the point of more informative docs that would
> explain supported types, automatic conversions and all such caveats
> (also for 8.3 and 8.4)?
I think a lot of these things are already documented. Aren't they?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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