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07aef52eba
Commit ac58465e06 moved the discussion on clustering from CLUSTER's
refpage to REPACK's, but somehow introduced a mistake regarding when
exactly can the seqscan-and-sort strategy be used with respect to btrees
(spoiler: it was 100% backwards). Fix that, but also restructure and
reword the whole subsection more fully to try and make it more coherent.
Author: Chao Li <li.evan.chao@gmail.com>
Author: Álvaro Herrera <alvherre@kurilemu.de>
Reported-by: Antonin Houska <ah@cybertec.at>
Backpatch-through: 19
Discussion: https://postgr.es/m/69CA7636-0359-42B6-B971-16A036698187@gmail.com