[Tile-serving] [openstreetmap/osm2pgsql] Should planet_osm_polygons have MultiPolygon geometry type, not Geometry? (#573)

[Rory McCann]

>> Standard Polygons can be converted to MultiPolygons (a multipolygon with just one polygon).

>There are operations you can do on polygons that you can't do on multipolygons

I can see [ST_ExteriorRing](http://postgis.net/docs/ST_ExteriorRing.html), are there others?

How about this: When using `-G` option, the data type could be MuliPolygon, and without `-G` it would be Polygon? Then the user will get data that works with the queries they expect to work.

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