[Tile-serving] [osm2pgsql] Straight line cut in 10 pieces by osm2pgsql and leading to mapnik issues (#507)

[damiendevienne]

Hello, 
I had some issue with rendering my data with mapnik and it appears to be related to the way data are stored in the database after import with osm2pgsql. 
I use a very simple example data of 2 nodes and 1 way linking them. 
When importating this to my database with osm2pgsql, it creates  10 rows in the planet_osm_line table, which in turn creates some problem with mapnik rendering for correctly spacing the text labels on the road. 

Is this split normal, and/or is there a way to avoid it? 

Thanks a lot. 

P.S. the osm file I used to test: 

```xml
<?xml version="1.0" encoding="UTF-8"?>
<osm version="0.6" generator="" copyright="OpenStreetMap" attribution="http://www.openstreetmap.org/copyright" license="http://opendatacommons.org/licenses/odbl/1-0/">
<bounds minlat="-90" minlon="-180" maxlat="90" maxlon="180"/>
<node id="623" visible="true" lat="-0.339746" lon="6.000000">
</node>
<node id="626" visible="true" lat="7.789438" lon="2.715955">
</node>
<way id="963" visible="true">
 <nd ref="626"/>
 <nd ref="623"/>
 <tag k="name" v="aaaaaaaaaaaaa" />
</way>
</osm>
```

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/507
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