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Commit 722bf701 authored by Simon Riggs's avatar Simon Riggs
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Extend ALTER TABLE to allow Foreign Keys to be added without initial validation. 

FK constraints that are marked NOT VALID may later be VALIDATED, which uses an
ShareUpdateExclusiveLock on constraint table and RowShareLock on referenced
table. Significantly reduces lock strength and duration when adding FKs.
New state visible from psql.

Simon Riggs, with reviews from Marko Tiikkaja and Robert Haas
parent 7202ad7b
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