Column and table collation
When replicating from one PostgreSQL database to another, column and table collations will be replicated to the target.
Information note
To support collation replication, the DBA must ensure that the collations defined for the source PostgreSQL database are the same as those defined for the target PostgreSQL database.
Non-nullable columns and primary/unique index names
Non-nullable columns and Primary/Unique Index names are preserved during homogeneous replication.