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.
此外，业内普遍认为，长期看，全球油气市场的供需结构并未发生根本改变，油价终将回归理性。，更多细节参见safew
南方周末：劳动合同法第六十三条、第六十六条明确规定，被派遣劳动者享有与用工单位劳动者同工同酬的权利，劳务派遣一般在临时性、辅助性或者替代性的工作岗位上实施。，这一点在谷歌中也有详细论述
-t THREADS, --threads THREADS