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	This extends cluster_rel() in such a way that more options can be added in the future, which will reduce the amount of chunk code for an upcoming SKIP_LOCKED aimed for VACUUM. As VACUUM FULL is a different flavor of CLUSTER, we want to make that extensible to ease integration. This only reworks the API and its callers, without providing anything user-facing. Two options are present now: verbose mode and relation recheck when doing the cluster command work across multiple transactions. This could be used as well as a base to extend the grammar of CLUSTER later on. Author: Michael Paquier Reviewed-by: Nathan Bossart Discussion: https://postgr.es/m/20180723031058.GE2854@paquier.xyz