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This commit refactors the vacuum routines that rely on VacuumParams, adding const markers where necessary to force a new policy in the code. This structure should not use a pointer as it may be used across multiple relations, and its contents should never be updated. vacuum_rel() stands as an exception as it touches the "index_cleanup" and "truncate" options. VacuumParams has been introduced in0d83138974, and661643dedahas fixed a bug impacting VACUUM operating on multiple relations. The changes done in tableam.h break ABI compatibility, so this commit can only happen on HEAD. Author: Shihao Zhong <zhong950419@gmail.com> Co-authored-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: Nathan Bossart <nathandbossart@gmail.com> Reviewed-by: Junwang Zhao <zhjwpku@gmail.com> Discussion: https://postgr.es/m/CAGRkXqTo+aK=GTy5pSc-9cy8H2F2TJvcrZ-zXEiNJj93np1UUw@mail.gmail.com