DBZ-1081 Fallback to restart_lsn in pg 9.5 #728
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https://issues.jboss.org/browse/DBZ-1081
In pg 9.5, confirmed_flush_lsn is not availiable. However, there is
restart_lsn, which should be safe to use with a downside of producing
some extra duplicate records.
This page: https://paquier.xyz/postgresql-2/postgres-9-6-feature-highlight-replication-slot-improvements/
indicates as such and this allows for DBZ to support PG 9.5