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ST_ConcaveHull - NULL factor (error)
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:memory: #use in-memory database
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SELECT ST_ConcaveHull(GeomFromText('MULTIPOINT(0 0, 1 1, 2 2, 0 1, 2 1)'), NULL);
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1 # rows (not including the header row)
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ST_ConcaveHull(GeomFromText('MULTIPOINT(0 0, 1 1, 2 2, 0 1, 2 1)'), NULL)