v.23.12Backward Incompatible Changes
MergeTree Setting clean_deleted_rows Deprecated; CLEANUP in OPTIMIZE Disabled by Default
The MergeTree settingclean_deleted_rowsis deprecated, it has no effect anymore. TheCLEANUPkeyword for theOPTIMIZEis not allowed by default (it can be unlocked with theallow_experimental_replacing_merge_with_cleanupsetting). #58267 (Alexander Tokmakov). This fixes #57930. This closes #54988. This closes #54570. This closes #50346. This closes #47579. The feature has to be removed because it is not good. We have to remove it as quickly as possible, because there is no other option. #57932 (Alexey Milovidov).