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For aggregations, things are a little more complex. A full table scan is also required unless the user is grouping by the primary key and sets optimize_aggregation_in_order=1. In this case, a propagation signal is sent once sufficient results are acquired. Provided previous steps of the query are capable of streaming the data, e.g., filter, then this mechanism will work, and the query will terminate early. Normally, however, an aggregation must consume all table data before returning and applying the LIMIT as the final stage.
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与此同时,美国汽油价格也明显上涨。美国汽车协会(AAA)数据显示,在2月28日伊朗冲突爆发后,美国普通汽油平均价格升至每加仑3.45美元,较一周前上涨约16%。(央视新闻),详情可参考新收录的资料
Полковник высказался о новом уровне конфликта Ирана с США и Израилем14:52
(二)不属于增值税法第六条规定的情形。。业内人士推荐新收录的资料作为进阶阅读