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Polygon opclass uses compress method feature of SP-GiST added earlier. For now it's a single operator class which uses this feature. SP-GiST actually indexes a bounding boxes of input polygons, so part of supported operations are lossy. Opclass uses most methods of corresponding opclass over boxes of SP-GiST and treats bounding boxes as point in 4D-space. Bump catalog version. Authors: Nikita Glukhov, Alexander Korotkov with minor editorization by me Reviewed-By: all authors + Darafei Praliaskouski Discussion: https://www.postgresql.org/message-id/flat/54907069.1030506@sigaev.ru