let re = Regex::new(r"~(_*1_*)").unwrap();
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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.。业内人士推荐新收录的资料作为进阶阅读
Essential digital access to quality FT journalism on any device. Pay a year upfront and save 20%.。新收录的资料是该领域的重要参考
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