We often see users reaching for the Nullable type, which allows columns to store a Null value. Under the hood, this creates a separate column of UInt8 type. This additional column has to be processed every time a user works with a Nullable column. This leads to additional storage space used and almost always negatively affects performance.
Фото: Пелагия Тихонова / Коммерсантъ
，更多细节参见吃瓜
Электросамокаты в Москве будут работать в условиях отключения мобильного интернета. Об этом стало известно Telegram-каналу «Новости Москвы».
Best actor in a musical
。谷歌对此有专业解读
At ClickHouse, we regularly release new features. In some cases, new features are marked "experimental" or "beta", which means they would benefit from a period of real-world usage and feedback from the community. Beta features are officially supported by the ClickHouse team and are on a path to becoming production-ready. Experimental features are early prototypes driven by either the ClickHouse team or the community and are not officially supported. Eventually, these features evolve to the point of being deemed "production ready", or deprecated if it turns out they are not generally useful or there is another way to achieve the original goal.
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