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Merge pull request #5934 from yandex/branch-for-changelog-stable-19-9
Add changelog for backporting of 19.7 and 19.9
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CHANGELOG.md
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CHANGELOG.md
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## ClickHouse release 19.9.4.1, 2019-07-05
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### Bug Fix
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* Fix segfault in Delta codec which affects columns with values less than 32 bits size. The bug led to random memory corruption. [#5786](https://github.com/yandex/ClickHouse/pull/5786) ([alesapin](https://github.com/alesapin))
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* Fix rare bug in checking of part with LowCardinality column. [#5832](https://github.com/yandex/ClickHouse/pull/5832) ([alesapin](https://github.com/alesapin))
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* Fix segfault in TTL merge with non-physical columns in block. [#5819](https://github.com/yandex/ClickHouse/pull/5819) ([Anton Popov](https://github.com/CurtizJ))
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* Fix potential infinite sleeping of low-priority queries. [#5842](https://github.com/yandex/ClickHouse/pull/5842) ([alexey-milovidov](https://github.com/alexey-milovidov))
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* Fix how ClickHouse determines default time zone as UCT instead of UTC. [#5828](https://github.com/yandex/ClickHouse/pull/5828) ([alexey-milovidov](https://github.com/alexey-milovidov))
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* Fix bug about executing distributed DROP/ALTER/TRUNCATE/OPTIMIZE ON CLUSTER queries on follower replica before leader replica. Now they will be executed directly on leader replica. [#5757](https://github.com/yandex/ClickHouse/pull/5757) ([alesapin](https://github.com/alesapin))
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* Fix race condition, which cause that some queries may not appear in query_log instantly after SYSTEM FLUSH LOGS query. [#5685](https://github.com/yandex/ClickHouse/pull/5685) ([Anton Popov](https://github.com/CurtizJ))
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* Added missing support for constant arguments to `evalMLModel` function. [#5820](https://github.com/yandex/ClickHouse/pull/5820) ([alexey-milovidov](https://github.com/alexey-milovidov))
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## ClickHouse release 19.7.6.1, 2019-07-05
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### Bug Fix
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* Fix performance regression in some queries with JOIN. [#5192](https://github.com/yandex/ClickHouse/pull/5192) ([Winter Zhang](https://github.com/zhang2014))
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## ClickHouse release 19.9.2.4, 2019-06-24
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### New Feature
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## ClickHouse release 19.9.4.1, 2019-07-05
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### Исправления ошибок
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* Исправлен segmentation fault в кодеке сжатия Delta в колонках с величинами размером меньше 32 бит. Ошибка могла приводить к повреждениям памяти. [#5786](https://github.com/yandex/ClickHouse/pull/5786) ([alesapin](https://github.com/alesapin))
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* Исправлена ошибка в проверке кусков в LowCardinality колонках. [#5832](https://github.com/yandex/ClickHouse/pull/5832) ([alesapin](https://github.com/alesapin))
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* Исправлен segmentation fault при слиянии кусков с истекшим TTL в случае, когда в блоке присутствуют столбцы, не входящие в структуру таблицы. [#5819](https://github.com/yandex/ClickHouse/pull/5819) ([Anton Popov](https://github.com/CurtizJ))
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* Исправлена существовавшая возможность ухода в бесконечное ожидание на низко-приоритетных запросах. [#5842](https://github.com/yandex/ClickHouse/pull/5842) ([alexey-milovidov](https://github.com/alexey-milovidov))
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* Исправлена ошибка определения таймзоны по умолчанию (UCT вместо UTC). [#5828](https://github.com/yandex/ClickHouse/pull/5828) ([alexey-milovidov](https://github.com/alexey-milovidov))
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* Исправлена ошибка в распределенных запросах вида DROP/ALTER/TRUNCATE/OPTIMIZE ON CLUSTER. [#5757](https://github.com/yandex/ClickHouse/pull/5757) ([alesapin](https://github.com/alesapin))
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* Исправлена ошибка, которая при распределенных запросах могла привести к тому, что некоторые запросы не появлялись в query_log сразу после SYSTEM FLUSH LOGS запроса. [#5685](https://github.com/yandex/ClickHouse/pull/5685) ([Anton Popov](https://github.com/CurtizJ))
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* Добавлена отсутствовавшая поддержка константных аргументов для функции `evalMLModel`. [#5820](https://github.com/yandex/ClickHouse/pull/5820) ([alexey-milovidov](https://github.com/alexey-milovidov))
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## ClickHouse release 19.7.6.1, 2019-07-05
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### Исправления ошибок
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* Исправлена просадка производительности в методе JOIN в некоторых видах запросов. [#5192](https://github.com/yandex/ClickHouse/pull/5192) ([Winter Zhang](https://github.com/zhang2014))
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## ClickHouse release 19.8.3.8, 2019-06-11
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### Новые возможности
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