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* Added functions `left`, `right`, `trim`, `ltrim`, `rtrim`, `timestampadd`, `timestampsub` for SQL standard compatibility. [#3826](https://github.com/yandex/ClickHouse/pull/3826) ([Ivan Blinkov](https://github.com/blinkov))
* Support for write in `HDFS` tables and `hdfs` table function. [#4084](https://github.com/yandex/ClickHouse/pull/4084) ([alesapin](https://github.com/alesapin))
* Added functions to search for multiple constant strings from big haystack: `multiPosition`, `multiSearch` ,`firstMatch` also with `-UTF8`, `-CaseInsensitive`, and `-CaseInsensitiveUTF8` variants. [#4053](https://github.com/yandex/ClickHouse/pull/4053) ([Danila Kutenin](https://github.com/danlark1))
* Pruning of unused shards if `SELECT` query filters by sharding key (setting `distributed_optimize_skip_select_on_unused_shards`). [#3851](https://github.com/yandex/ClickHouse/pull/3851) ([Ivan](https://github.com/abyss7))
* Pruning of unused shards if `SELECT` query filters by sharding key (setting `distributed_optimize_skip_select_on_unused_shards`). [#3851](https://github.com/yandex/ClickHouse/pull/3851) ([Gleb Kanterov](https://github.com/kanterov), [Ivan](https://github.com/abyss7))
* Allow `Kafka` engine to ignore some number of parsing errors per block. [#4094](https://github.com/yandex/ClickHouse/pull/4094) ([Ivan](https://github.com/abyss7))
* Added support for `CatBoost` multiclass models evaluation. Function `modelEvaluate` returns tuple with per-class raw predictions for multiclass models. `libcatboostmodel.so` should be built with [#607](https://github.com/catboost/catboost/pull/607). [#3959](https://github.com/yandex/ClickHouse/pull/3959) ([KochetovNicolai](https://github.com/KochetovNicolai))
* Added functions `filesystemAvailable`, `filesystemFree`, `filesystemCapacity`. [#4097](https://github.com/yandex/ClickHouse/pull/4097) ([Boris Granveaud](https://github.com/bgranvea))