Deduplicating at query time can be achieved by grouping the data on the fields, which uniquely identify a row, and using the argMax function with a date field to identify the last value for other fields. ReplacingMergeTree allows rows with the same sorting key (ORDER BY key) to be deduplicated on merges. Note this is "best effort" only: sometimes parts will not be merged with the merge process scheduled at non-deterministic intervals. It, therefore, does not guarantee the absence of duplicates. Users can also utilize the FINAL modifier to force this deduplication at SELECT time. While FINAL does add overhead, it has received significant performance improvements in recent versions including multi-threaded processing, and is suitable for many production workloads.
AoS to SoA (No Print/Ranges +
，详情可参考wps
Сивков добавил, что баллистические ракеты маневрируют на траектории, поэтому их сложно сбить существующими средствами противовоздушной обороны (ПВО). По его словам, ракеты способны преодолеть ПВО Израиля и американского флота.
Alongside the new feature, TikTok and Apple are also introducing a way for fans to listen to music live with their favorite artists. TikTok's Listening Party feature creates a live "shared environment" where people can listen to music and interact with artists directly, in what effectively sounds like an audio-only livestream. TikTok livestreams are a whole ecosystem in their own right, and Listening Party seems like a way to leverage some of the same technology for a more controlled, music promotion-focused end.