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Presently, pgstat_fetch_stat_beentry() accepts a session's backend ID as its argument, and pgstat_fetch_stat_local_beentry() accepts a 1-based index in an internal array as its argument. The former is typically used wherever a user must provide a backend ID, and the latter is usually used internally when looping over all entries in the array. This difference was first introduced by d7e39d72ca. Before that commit, both functions accepted a 1-based index to the internal array. This commit renames these two functions to make it clear whether they use the backend ID or the 1-based index to look up the entry. This is preparatory work for a follow-up change that will introduce a function for looking up a LocalPgBackendStatus using a backend ID. Reviewed-by: Ian Barwick, Sami Imseih, Michael Paquier, Robert Haas Discussion: https://postgr.es/m/CAB8KJ%3Dj-ACb3H4L9a_b3ZG3iCYDW5aEu3WsPAzkm2S7JzS1Few%40mail.gmail.com Backpatch-through: 16