ClickHouse/v20.12.5.14-stable.md at aa117869d673ed5490a36580d1e6b4836becf40f

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Backported in #18166: Fix error when query MODIFY COLUMN ... REMOVE TTL doesn't actually remove column TTL. #18130 (alesapin).
Backported in #18424: Fix possible crashes in aggregate functions with combinator Distinct, while using two-level aggregation. Fixes #17682. #18365 (Anton Popov).
Backported in #18428: Fix filling table system.settings_profile_elements. This PR fixes #18231. #18379 (Vitaly Baranov).
Backported in #18482: Restrict merges from wide to compact parts. In case of vertical merge it led to broken result part. #18381 (Anton Popov).
Backported in #18471: Fixed value is too short error when executing toType(...) functions (toDate, toUInt32, etc) with argument of type Nullable(String). Now such functions return NULL on parsing errors instead of throwing exception. Fixes #7673. #18445 (Alexander Tokmakov).
Backported in #18533: Proper support for 12AM in parseDateTimeBestEffort function. This fixes #18402. #18449 (vladimir-golovchenko).
Backported in #18502: Disable write with AIO during merges because it can lead to extremely rare data corruption of primary key columns during merge. #18481 (alesapin).