GeoJSON Multipolygon Support #123
Merged
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This PR adds support for parsing multipolygons in Magellan by treating a MultiPolygon as a list of polygons and emitting a row per polygon.
Emitting one row per shape allows us to use spatial indexes without having to create a specialized datastructure for Multipolygons whose overhead is heavy.
Multipolygons all share the same properties map.
Client side code that needs to logically regroup this multipolygon for any reason can add / use identifiers in the properties map to regroup the polygons as needed.
This closes issues #30 , #55 , #66