Replication origins is a useful feature for external replication systems to do conflict resolution in bi-directional replication. It's possible for the external systems to make use of this feature using the SQL functions pg_replication_origin_*().
pg_replication_origin_session_setup() is the one to configure the current session. Currently, only a single version of this function is exposed that allows one replica origin to be used only by a single session. This limits the usefulness of this feature. The attached patch creates another variant of this function pg_replication_origin_session_setup(text, int). This allows the same replica origin to be used by parallel sessions the same way logical replication apply workers are using it. I'll add this to the next commitfest.
v00-pg_replication_origin_session_setup_acquired_by.patch
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