For memory-intensive aggregations or sorting scenarios, users can use the settings max_bytes_before_external_group_by and max_bytes_before_external_sort respectively. The former of these is discussed extensively here. In summary, this ensures any aggregations can "spill" out to disk if a memory threshold is exceeded. This will impact query performance but will help ensure queries do not run out of memory. The latter sorting setting helps address similar issues with memory-intensive sorts. This can be particularly important in distributed environments where a coordinating node receives sorted responses from child shards. In this case, the coordinating server can be asked to sort a dataset larger than its available memory. With max_bytes_before_external_sort, sorting can be allowed to spill over to disk. This setting is also helpful for cases where the user has an ORDER BY after a GROUP BY with a LIMIT, especially in cases where the query is distributed.
ВсеОбществоПолитикаПроисшествияРегионыМосква69-я параллельМоя страна
，详情可参考新收录的资料
第三十条 船舶留置权，是指造船人、修船人在合同另一方未按照约定支付船舶建造或者修理费用时，留置已经合法占有的船舶，并就该船舶优先受偿的权利。
before the final test, so the branch depended on the wrong value. It，更多细节参见新收录的资料
Lightweight updates via UPDATE powered by patch parts — these write only the changed column values as compact delta parts, making them far more efficient for frequent or targeted updates.。PDF资料对此有专业解读
FT Edit: Access on iOS and web