polygon overlay

From: Gary Fu <gfu(at)sigmaspace(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: polygon overlay
Date: 2010-08-31 21:14:24
Message-ID: i5jrbg$1nph$1@news.hub.org
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Hi,

I don't see any overlap between the polygon and the box in the following
sql. Can anyone explain why it returns 't'?

select polygon(path '((0,0),(10,10),(20,10),(10,0))') && polygon(box
'((16,0),(17,1))');
?column?
----------
t
(1 row)

Thanks,
Gary

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