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ST_DelaunayTriangulation - (only_edges=yes)
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:memory: #use in-memory database
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SELECT ST_Equals(ST_DelaunayTriangulation(GeomFromText('MULTIPOINTZ(0 0 10, 1 1 11, 2 2 12, 0 1 13, 2 1 14)'), 1), GeomFromText('MULTILINESTRINGZ((0 1 13, 2 2 12), (0 0 10, 0 1 13), (0 0 10, 2 1 14), (2 1 14, 2 2 12), (1 1 11, 2 1 14), (1 1 11, 2 2 12), (0 1 13, 1 1 11), (0 0 10, 1 1 11))'));
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1 # rows (not including the header row)
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ST_Equals(ST_DelaunayTriangulation(GeomFromText('MULTIPOINTZ(0 0 10, 1 1 11, 2 2 12, 0 1 13, 2 1 14)'), 1), GeomFromText('MULTILINESTRINGZ((0 1 13, 2 2 12), (0 0 10, 0 1 13), (0 0 10, 2 1 14), (2 1 14, 2 2 12), (1 1 11, 2 1 14), (1 1 11, 2 2 12), (0 1 13, 1 1 11), (0 0 10, 1 1 11))'))