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Changelog for 19.7

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## ClickHouse release 19.7.3.9, 2019-05-30
### New Features
* Allow setting constraints such as `max_memory_usage` in users.xml.
[#4931](https://github.com/yandex/ClickHouse/pull/4931) ([Vitaly
Baranov](https://github.com/vitlibar))
* Add a second version of the function `groupUniqArray` with an optional
`max_size` parameter that limits the size of the resulting array. This
behavior is to `groupArray(max_size)(x)` function.
[#5026](https://github.com/yandex/ClickHouse/pull/5026) ([Guillaume
Tassery](https://github.com/YiuRULE))
* For TSVWithNames/CSVWithNames input file formats, column order can now be
determined from file header. This is controlled by
`input_format_with_names_use_header` parameter.
[#5081](https://github.com/yandex/ClickHouse/pull/5081)
([Alexander](https://github.com/Akazz))
### Bug Fixes
* Crash with uncompressed_cache + JOIN during merge (#5197)
[#5133](https://github.com/yandex/ClickHouse/pull/5133) ([Danila
Kutenin](https://github.com/danlark1))
* Segmentation fault on a clickhouse-client query to system tables. #5066
[#5127](https://github.com/yandex/ClickHouse/pull/5127)
([Ivan](https://github.com/abyss7))
* Data loss on heavy load via KafkaEngine (#4736)
[#5080](https://github.com/yandex/ClickHouse/pull/5080)
([Ivan](https://github.com/abyss7))
### Performance Improvements
* Use radix sort for sorting by single numeric column in `ORDER BY` without
`LIMIT`. [#5106](https://github.com/yandex/ClickHouse/pull/5106)
([alexey-milovidov](https://github.com/alexey-milovidov))
* Implement radix sort for `ORDER BY`.
[#4439](https://github.com/yandex/ClickHouse/pull/4439) ([Evgenii
Pravda](https://github.com/kvinty))
### Documentation
* Translate documentation for some table engines to Chinese.
[#5107](https://github.com/yandex/ClickHouse/pull/5107),
[#5094](https://github.com/yandex/ClickHouse/pull/5094),
[#5087](https://github.com/yandex/ClickHouse/pull/5087),
([张风啸](https://github.com/AlexZFX),
[#5068](https://github.com/yandex/ClickHouse/pull/5068) ([never
lee](https://github.com/neverlee))
### Build/Testing/Packaging Improvements
* Print UTF-8 characters properly in `clickhouse-test`.
[#5084](https://github.com/yandex/ClickHouse/pull/5084)
([alexey-milovidov](https://github.com/alexey-milovidov))
* Adde command line parameter for clickhouse-client to always load suggestion
data. [#5102](https://github.com/yandex/ClickHouse/pull/5102)
([alexey-milovidov](https://github.com/alexey-milovidov))
* Resolve some of PVS-Studio warnings.
[#5082](https://github.com/yandex/ClickHouse/pull/5082)
([alexey-milovidov](https://github.com/alexey-milovidov))
* Update LZ4 [#5040](https://github.com/yandex/ClickHouse/pull/5040) ([Danila
Kutenin](https://github.com/danlark1))
* Add gperf to build requirements for upcoming pull request #5030.
[#5110](https://github.com/yandex/ClickHouse/pull/5110)
([proller](https://github.com/proller))
## ClickHouse release 19.6.2.11, 2019-05-13
### New Features