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Commit f82ec32ac30ae7e3ec7c84067192535b2ff8ec0e renamed the pg_xlog directory to pg_wal. To make things consistent, and because "xlog" is terrible terminology for either "transaction log" or "write-ahead log" rename all SQL-callable functions that contain "xlog" in the name to instead contain "wal". (Note that this may pose an upgrade hazard for some users.) Similarly, rename the xlog_position argument of the functions that create slots to be called wal_position. Discussion: https://www.postgresql.org/message-id/CA+Tgmob=YmA=H3DbW1YuOXnFVgBheRmyDkWcD9M8f=5bGWYEoQ@mail.gmail.com