Hello I doubt that "Process ID of the lock group leader" is enough for user documentation. I think we need note: - this field is related to parallel query execution - leader_pid = pid if process is parallel leader - leader_pid would point to pid of the leader if process is parallel worker - leader_pid will be NULL for non-parallel queries or idle sessions
Also patch has no tests. Possible this is normal, not sure how to write a reliable test for this feature. Patch applies, compiles, pass tests regards, Sergei
