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This reverts the following set of commits, following complaints about the lack of portability of the central part of the code in bufmgr.c as well as the use of partition mapping locks during page reads:c780a7a9
f2b88396
b787d4ce
ce7f772c
60a51c6b
Per discussion with Andres Freund, Robert Haas and myself. Bump catalog version. Discussion: https://postgr.es/m/20201029181729.2nrub47u7yqncsv7@alap3.anarazel.de