[postgis-devel] Testing ST_LineMerge issue

Obe, Regina robe.dnd at cityofboston.gov
Wed Dec 17 07:33:19 PST 2008

I was thinking about this failed test more and even though I had
dismissed it as something only a Monkey would do that is not urgent.  

It has occurred to me that I may run into this issue with Monkey users
and I may have already that may be a culprit in my geoserver random

At least one of the projects I'm working on I have run into users
creating invalid geometries.  Since they put in a lot of effort making
these monsters, we decided to just check on some schedule to make sure
the new geometries being created are valid.

The monster I am talking about is this innocent one that I took out of
the torture script because well you can't torture a dead server.

In its simplest form it looks like this.

SELECT ST_LineMerge(ST_MakeLine(ST_Point(1,1), ST_Point(1,1)));

Now there are 2 issues here.

1) GEOS ST_LineMerge is obviously not smart enough to realize that
linemerging something like that is silly.

2) ST_MakeLine lets you get away with creating this monstrosity.  Which
hmm I suppose there are reasons why someone may want to, but perhaps we
shouldn't go there.

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