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Add the empty constructors for 4 typed SpatialRDDs #211
Is this PR related to a proposed Issue?
What changes were proposed in this PR?
Add the empty constructors for 4 typed SpatialRDDs. So, the users can create an empty SpatialRDD and manually assemble it.
This is especially useful when the users want to load a persisted RDD from disk and assemble a typed SpatialRDD by themselves.
How was this patch tested?
Passed the regression test. Added four corresponding unit tests: build an empty spatialRDD and manually assemble it.
Did this PR include necessary documentation updates?
This change will add new APIs. JavaDoc has been added.