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Patch allows to have different types of column and value stored in leaf tuples of SP-GiST. The main application of feature is to transform complex column type to simple indexed type or for truncating too long value, transformation could be lossy. Simple example: polygons are converted to their bounding boxes, this opclass follows. Authors: me, Heikki Linnakangas, Alexander Korotkov, Nikita Glukhov Reviewed-By: all authors + Darafei Praliaskouski Discussions: https://www.postgresql.org/message-id/5447B3FF.2080406@sigaev.ru https://www.postgresql.org/message-id/flat/54907069.1030506@sigaev.ru#54907069.1030506@sigaev.ru