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Daniel Gustafsson b030697d36 Refuse upgrades from pre-9.0 clusters ... Commit 695b4a113a added a dependency on retrieving oldestxid from pg_control, which only exists in 9.0 and onwards, but the check for 8.4 as the oldest version was retained. Since there has been few if any complaints of 8.4 upgrades not working, fix by setting 9.0 as the oldest version supported rather than resurrecting 8.4 support. Backpatch to all supported versions. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/1973418.1657040382@sss.pgh.pa.us Backpatch-through: v12		1 year ago
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src	Refuse upgrades from pre-9.0 clusters	1 year ago
KNOWN_BUGS	…
MISSING_FEATURES	…
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