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This is useful for monitoring purposes with log parsing. Similarly to pg_stat_activity, the leader's PID is shown only for active parallel workers, minimizing the log footprint for the leaders as the equivalent shared memory field is set as long as a backend is alive. Author: Justin Pryzby Reviewed-by: Álvaro Herrera, Michael Paquier, Julien Rouhaud, Tom Lane Discussion: https://postgr.es/m/20200315111831.GA21492@telsasoft.com