Will the new MemSQL version be able to calculate the union of polygons? For example calcuate the border of two adjacent or even intercepting polygons?
+----+
| |
| +-+--+
+--+-+ |
| |
+----+
to
+----+
| |
| +--+
+--+ |
| |
+----+
MemSQL 4 includes topological functions (eg, geography_intersects()) that return a boolean, and measurement functions like distance and length. It does not yet have constructor functions like intersection(), which would output a polygon as you describe. It's on the roadmap, though.