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Add bugfixes for 19.5.2
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CHANGELOG.md
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CHANGELOG.md
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## ClickHouse release 19.5.1.246, 2019-04-15
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## ClickHouse release 19.5.2.6, 2019-04-15
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### New Features
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* `multiSearchFirstPosition` function was added. [#4780](https://github.com/yandex/ClickHouse/pull/4780) ([Danila Kutenin](https://github.com/danlark1))
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* Implement the predefined expression filter per row for tables. [#4792](https://github.com/yandex/ClickHouse/pull/4792) ([Ivan](https://github.com/abyss7))
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* A new type of data skipping indices based on bloom filters (can be used for `equal`, `in` and `like` functions). [#4499](https://github.com/yandex/ClickHouse/pull/4499) ([Nikita Vasilev](https://github.com/nikvas0))
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* Added `ASOF JOIN` which allows to run queries that join to the most recent value known. [#4774](https://github.com/yandex/ClickHouse/pull/4774) [#4867](https://github.com/yandex/ClickHouse/pull/4867) [#4863](https://github.com/yandex/ClickHouse/pull/4863) ([Martijn Bakker](https://github.com/Gladdy))
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* Added `ASOF JOIN` which allows to run queries that join to the most recent value known. [#4774](https://github.com/yandex/ClickHouse/pull/4774) [#4867](https://github.com/yandex/ClickHouse/pull/4867) [#4863](https://github.com/yandex/ClickHouse/pull/4863) [#4875](https://github.com/yandex/ClickHouse/pull/4875) ([Martijn Bakker](https://github.com/Gladdy)) ([Artem Zuikov](https://github.com/4ertus2))
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* Rewrite multiple `COMMA JOIN` to `CROSS JOIN`. Then rewrite them to `INNER JOIN` if possible. [#4661](https://github.com/yandex/ClickHouse/pull/4661) ([Artem Zuikov](https://github.com/4ertus2))
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### Improvement
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* Improved usage of scratch space and error handling in Hyperscan. [#4866](https://github.com/yandex/ClickHouse/pull/4866) ([Danila Kutenin](https://github.com/danlark1))
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* Fill `system.graphite_detentions` from a table config of `*GraphiteMergeTree` engine tables. [#4584](https://github.com/yandex/ClickHouse/pull/4584) ([Mikhail f. Shiryaev](https://github.com/Felixoid))
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* Rename `trigramDistance` function to `ngramDistance` and add more functions with `CaseInsensitive` and `UTF`. [#4602](https://github.com/yandex/ClickHouse/pull/4602) ([Danila Kutenin](https://github.com/danlark1))
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* Improved data skipping indices calculation. [#4640](https://github.com/yandex/ClickHouse/pull/4640) ([Nikita Vasilev](https://github.com/nikvas0)
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* Improved data skipping indices calculation. [#4640](https://github.com/yandex/ClickHouse/pull/4640) ([Nikita Vasilev](https://github.com/nikvas0))
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### Bug Fix
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* Fix a race condition during concurrent `ALTER COLUMN` queries that could lead to a server crash (fixes issue [#3421](https://github.com/yandex/ClickHouse/issues/3421)). [#4592](https://github.com/yandex/ClickHouse/pull/4592) ([Alex Zatelepin](https://github.com/ztlpn))
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* Fix incorrect result in `FULL/RIGHT JOIN` with const column. [#4723](https://github.com/yandex/ClickHouse/pull/4723) ([Artem Zuikov](https://github.com/4ertus2))
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* Fix duplicates in `GLOBAL JOIN` with asterisk. [#4705](https://github.com/yandex/ClickHouse/pull/4705) ([Artem Zuikov](https://github.com/4ertus2))
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* Fix parameter deduction in `ALTER MODIFY` of column `CODEC` when column type is not specified. [#4883](https://github.com/yandex/ClickHouse/pull/4883) ([alesapin](https://github.com/alesapin))
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* Functions `cutQueryStringAndFragment()` and `queryStringAndFragment()` now works correctly when `URL` contains a fragment and no query. [#4894](https://github.com/yandex/ClickHouse/pull/4894) ([Vitaly Baranov](https://github.com/vitlibar))
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* Fix rare bug when setting `min_bytes_to_use_direct_io` is greater than zero, which occures when thread have to seek backward in column file. [#4897](https://github.com/yandex/ClickHouse/pull/4897) ([alesapin](https://github.com/alesapin))
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* Fix wrong argument types for aggregate functions with `LowCardinality` arguments (fixes issue [#4919](https://github.com/yandex/ClickHouse/issues/4919)). [#4922](https://github.com/yandex/ClickHouse/pull/4922) ([Nikolai Kochetov](https://github.com/KochetovNicolai))
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* Fix wrong name qualification in `GLOBAL JOIN`. [#4969](https://github.com/yandex/ClickHouse/pull/4969) ([Artem Zuikov](https://github.com/4ertus2))
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* Function `toISOWeek` result for year 1970. [#4988](https://github.com/yandex/ClickHouse/pull/4988) ([alexey-milovidov](https://github.com/alexey-milovidov))
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* Fix `DROP`, `TRUNCATE` and `OPTIMIZE` queries duplication, when executed on `ON CLUSTER` for `ReplicatedMergeTree*` tables family. [#4991](https://github.com/yandex/ClickHouse/pull/4991) ([alesapin](https://github.com/alesapin))
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### Backward Incompatible Change
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### Performance Improvement
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* Optimize Volnitsky searcher by inlining, giving about 5-10% search improvement for queries with many needles or many similar bigrams. [#4862](https://github.com/yandex/ClickHouse/pull/4862) ([Danila Kutenin](https://github.com/danlark1))
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* Fix performance issue when setting `use_uncompressed_cache` is greater than zero, which appeared when all read data contained in cache. [#4913](https://github.com/yandex/ClickHouse/pull/4913) ([alesapin](https://github.com/alesapin))
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### Build/Testing/Packaging Improvement
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