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singlesidedbuffer - POLYGON, int radius, right side
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:memory: #use in-memory database
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SELECT AsText(SingleSidedBuffer(GeomFromText("POLYGON((0 0, 0 20, 1 20, 1 0, 0 0))"), 3, 0))
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1 # rows (not including the header row)
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AsText(SingleSidedBuffer(GeomFromText("POLYGON((0 0, 0 20, 1 20, 1 0, 0 0))"), 3, 0))