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Amit Kapila d540a02a72 Display the leader apply worker's PID for parallel apply workers. ... Add leader_pid to pg_stat_subscription. leader_pid is the process ID of the leader apply worker if this process is a parallel apply worker. If this field is NULL, it indicates that the process is a leader apply worker or a synchronization worker. The new column makes it easier to distinguish parallel apply workers from other kinds of workers and helps to identify the leader for the parallel workers corresponding to a particular subscription. Additionally, update the leader_pid column in pg_stat_activity as well to display the PID of the leader apply worker for parallel apply workers. Author: Hou Zhijie Reviewed-by: Peter Smith, Sawada Masahiko, Amit Kapila, Shveta Mallik Discussion: https://postgr.es/m/CAA4eK1+wyN6zpaHUkCLorEWNx75MG0xhMwcFhvjqm2KURZEAGw@mail.gmail.com		3 years ago
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src	Display the leader apply worker's PID for parallel apply workers.	3 years ago
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