WL#2058: GIS: Make spatial keys null-safe
Affects: Server-7.0 — Status: Assigned — Priority: Medium
Now spatial keys don't accept NULL values, so SPATIAL field usually has to be NOT NULL. But for some tasks it'd be suitable to have nulls in the spatial columns. Techinically, I think easiest solution is to add the separate list for NULL-s to the RTree where we put not-nulls.
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