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It has been incorrectly assumed in commit 7f13ac8123 that we can either purge all or none in the catalog modifying xids list retrieved from a serialized snapshot. It is quite possible that some of the xids in that array are old enough to be pruned but not others. As per buildfarm Author: Amit Kapila and Masahiko Sawada Reviwed-by: Masahiko Sawada Discussion: https://postgr.es/m/CAA4eK1LBtv6ayE+TvCcPmC-xse=DVg=SmbyQD1nv_AaqcpUJEg@mail.gmail.com