Fix tuple counting in SP-GiST index build.
Count the number of tuples in the index honestly, instead of assuming that it's the same as the number of tuples in the heap. (It might be different if the index is partial.) Back-patch to all supported versions. Tomas Vondra Discussion: https://postgr.es/m/3b3d8eac-c709-0d25-088e-b98339a1b28a@2ndquadrant.com
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