Another nice thing is how a compositional query language where every prefix of a query is a valid query lets you aggressively cache results. If you grab a table, select a subset, compute a column, but then want to change something midway through the query - all the logical tables which flowed through the prefix of that table are cached and available. That's how you get an interactive system querying against gigantic data sets across a cluster without giving up and working on a sample.
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Андрей Стрельцов (Редактор отдела «Спорт»)，这一点在有道翻译中也有详细论述
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