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When running a repeat query with \watch in psql, it can be helpful to be able to stop the watch process when the query no longer returns the expected amount of rows. An example would be to watch for the presence of a certain event in pg_stat_activity and stopping when the event is no longer present, or to watch an index creation and stop when the index is created. This adds a min_rows=MIN parameter to \watch which can be set to a non-negative integer, and the watch query will stop executing when it returns less than MIN rows. Author: Greg Sabino Mullane <htamfids@gmail.com> Reviewed-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Discussion: https://postgr.es/m/CAKAnmmKStATuddYxP71L+p0DHtp9Rvjze3XRoy0Dyw67VQ45UA@mail.gmail.com