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Commit 47167b79 authored by Simon Riggs's avatar Simon Riggs
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Reduce lock levels for ALTER TABLE SET autovacuum storage options

Reduce lock levels down to ShareUpdateExclusiveLock for all autovacuum-related
relation options when setting them using ALTER TABLE.

Add infrastructure to allow varying lock levels for relation options in later
patches. Setting multiple options together uses the highest lock level required
for any option. Works for both main and toast tables.

Fabrízio Mello, reviewed by Michael Paquier, mild edit and additional regression
tests from myself
parent f16d5226
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