Of course, that doesn’t mean Bourdieu was wrong. Probably things just changed. Why? Well, one conspiracy theory is that it just became too easy for lower-class people to imitate upper-class tastes, so upper-class people moved to higher ground.
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.。PDF资料对此有专业解读
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