[BUGS] BUG #14768: CREATE INDEX CONCURRENTLY IF NOT EXISTS cancelsautovacuum even if the index already exists.

The following bug has been logged on the website:

Bug reference:      14768
Logged by:          Marcin Barczyński
Email address:      mba.ogolny@gmail.com
PostgreSQL version: 9.6.3
Operating system:   Ubuntu 14.04 but most probably it doesn't matter
Description:

I am perfectly aware of the fact that CREATE INDEX CONCURRENTLY on a table
cancels a running autovacuum process on that table. 
But CREATE INDEX CONCURRENTLY IF NOT EXISTS should take
ShareUpdateExclusiveLock only after checking that the index doesn't exist.


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