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singlesidedbuffer - LINESTRING X, float radius, right side
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:memory: #use in-memory database
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SELECT AsText(SingleSidedBuffer(GeomFromText("LINESTRING(0 0, 0 20)"), 3.5, 0));
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1 # rows (not including the header row)
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AsText(SingleSidedBuffer(GeomFromText("LINESTRING(0 0, 0 20)"), 3.5, 0))
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POLYGON((0 0, 0 20, 3.5 20, 3.5 0, 0 0))