Tests if the ST_MultiCurve value is closed. A curve is closed if the start and end points are coincident. A multicurve is closed if it is non-empty and has an empty boundary.
By default, ST_IsClosed uses the original format for a geometry, if it is available. Otherwise, the internal format is used. For more information about internal and original formats, see STORAGE FORMAT clause, CREATE SPATIAL REFERENCE SYSTEM statement.
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