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* Functions `greatest` and `least` now ignore NULL input values, whereas they previously returned NULL if one of the arguments was NULL. For example, `SELECT greatest(1, 2, NULL)` now returns 2. This makes the behavior compatible with PostgreSQL, but at the same time it breaks the compatibility with MySQL which returns NULL. To retain the previous behavior, set setting `least_greatest_legacy_null_behavior` (default: `false`) to `true`. [#65519](https://github.com/ClickHouse/ClickHouse/pull/65519) ([kevinyhzou](https://github.com/KevinyhZou)).
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*The legacy MongoDB integration based on the Poco driver has been removed. Server setting `use_legacy_mongodb_integration` is obsolete and has no effect anymore. [#71997](https://github.com/ClickHouse/ClickHouse/pull/71997) ([Kirill Nikiforov](https://github.com/allmazz)). The new integration is strictly more capable and powerful.
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* Functions `greatest` and `least` now ignore NULL input values, whereas they previously returned NULL if one of the arguments was NULL. For example, `SELECT greatest(1, 2, NULL)` now returns 2. This makes the behavior compatible with PostgreSQL, but at the same time it breaks the compatibility with MySQL which returns NULL. To retain the previous behavior, set setting `least_greatest_legacy_null_behavior` (default: `false`) to `true`. [#65519](https://github.com/ClickHouse/ClickHouse/pull/65519)[#73344](https://github.com/ClickHouse/ClickHouse/pull/73344)([kevinyhzou](https://github.com/KevinyhZou)).
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*A new MongoDB integration is now the default. Users who like to use the legacy MongoDB driver (based on the Poco driver) can enable server setting `use_legacy_mongodb_integration`. [#73359](https://github.com/ClickHouse/ClickHouse/pull/73359) ([Kirill Nikiforov](https://github.com/allmazz).
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#### New Feature
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* Move `JSON`/`Dynamic`/`Variant` types from experimental features to beta. [#72294](https://github.com/ClickHouse/ClickHouse/pull/72294) ([Pavel Kruglov](https://github.com/Avogar)). We also backported all fixes as well as this change to 24.11.
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* Remove the `allow_experimental_join_condition` setting, allowing non-equi conditions by default. [#69910](https://github.com/ClickHouse/ClickHouse/pull/69910) ([Vladimir Cherkasov](https://github.com/vdimir)).
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* Settings from server config (users.xml) now apply on the client too. Useful for format settings, e.g. `date_time_output_format`. [#71178](https://github.com/ClickHouse/ClickHouse/pull/71178) ([Michael Kolupaev](https://github.com/al13n321)).
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* Automatic `GROUP BY`/`ORDER BY` to disk based on the server/user memory usage. Controlled with `max_bytes_ratio_before_external_group_by`/`max_bytes_ratio_before_external_sort` query settings. [#71406](https://github.com/ClickHouse/ClickHouse/pull/71406) ([Azat Khuzhin](https://github.com/azat)).
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* Adding a new cancellation logic using a singleton object `CancellationChecker` which checks the timeouts for queries. [#69880](https://github.com/ClickHouse/ClickHouse/pull/69880) ([Yarik Briukhovetskyi](https://github.com/yariks5s)).
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* Adding a new cancellation logic: `CancellationChecker` checks timeouts for every started query and stops them once the timeout has reached. [#69880](https://github.com/ClickHouse/ClickHouse/pull/69880) ([Yarik Briukhovetskyi](https://github.com/yariks5s)).
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* Support ALTER from `Object` to `JSON`, which means you can easily migrate from the deprecated Object type. [#71784](https://github.com/ClickHouse/ClickHouse/pull/71784) ([Pavel Kruglov](https://github.com/Avogar)).
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* Allow unknown values in set that are not present in Enum. Fix [#72662](https://github.com/ClickHouse/ClickHouse/issues/72662). [#72686](https://github.com/ClickHouse/ClickHouse/pull/72686) ([zhanglistar](https://github.com/zhanglistar)).
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* Support string search operator (eg., LIKE) for `Enum` data type, implements [#72661](https://github.com/ClickHouse/ClickHouse/issues/72661). [#72732](https://github.com/ClickHouse/ClickHouse/pull/72732) ([zhanglistar](https://github.com/zhanglistar)).
Copy file name to clipboardExpand all lines: README.md
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@@ -42,8 +42,10 @@ Every month we get together with the community (users, contributors, customers,
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Keep an eye out for upcoming meetups and events around the world. Somewhere else you want us to be? Please feel free to reach out to tyler `<at>` clickhouse `<dot>` com. You can also peruse [ClickHouse Events](https://clickhouse.com/company/news-events) for a list of all upcoming trainings, meetups, speaking engagements, etc.
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Upcoming meetups
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*[Dubai Meetup](https://www.meetup.com/clickhouse-dubai-meetup-group/events/303096989/) - Feb 3
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*[Tokyo Meetup](https://www.meetup.com/clickhouse-tokyo-user-group/events/305126993/) - Jan 23
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*[FOSDEM 2025](https://www.fosdem.org/2025/schedule/event/fosdem-2025-6351-how-we-built-a-new-powerful-json-data-type-for-clickhouse/) - Feb 1, 2
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*[London Meetup](https://www.meetup.com/clickhouse-london-user-group/events/305146729/) - Feb 5
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*[Dubai Meetup](https://www.meetup.com/clickhouse-dubai-meetup-group/events/303096989/) - Feb 10
RUN curl -sL -O https://github.com/phracker/MacOSX-SDKs/releases/download/11.3/MacOSX11.0.sdk.tar.xz
RUN sed -i "s|http://archive.ubuntu.com|$apt_archive|g" /etc/apt/sources.list
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