While looking at this, I realized that "PqMsg_Progress" is the name of the 'P' message that was added for parallel index progress reporting.
I missed [1] at the time, but if there is still a chance to rename it to "PqMsg_ParallelWorkerProgress", that seems better, "PqMsg_Progress" does not really describe what it is, whereas "PqMsg_ParallelWorkerProgress" makes it explicit that this is a parallel-worker-to-leader message. It also matches other places in the code that deal with parallel workers, such as "IsParallelWorker", so it is easier to find when looking through parallel-worker code. [1] https://www.postgresql.org/message-id/ZpboPlg1v38vJhsD%40nathan -- Sami Imseih Amazon Web Services (AWS)
