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A prepared statement is re-analyzed and re-planned whenever database objects used in the statement have undergone definitional changes or the planner statistics of them have been updated. The former has been documented from before, but the latter was not previously. This commit adds the description about the latter case into the docs. Author: Atsushi Torikoshi Reviewed-by: Andy Fan, Fujii Masao Discussion: https://postgr.es/m/3ac82f4817c9fe274a905c8a38d87bd9@oss.nttdata.com