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(parent: 3063e7a) | patch

Introduce traversalValue for SP-GiST scan

Introduce traversalValue for SP-GiST scan

During scan sometimes it would be very helpful to know some information about
parent node or all ancestor nodes. Right now reconstructedValue could be used
but it's not a right usage of it (range opclass uses that).

traversalValue is arbitrary piece of memory in separate MemoryContext while
reconstructedVale should have the same type as indexed column.

Subsequent patches for range opclass and quad4d tree will use it.

Author: Alexander Lebedev, Teodor Sigaev

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