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I'm amazed how similar the code example on the landing page looks to dplyr, which is great in my book. dplyr borrowed heavily from SQL (even if you're not an R user, some of Hadley's design papers are definitely worth reading), but it's never going to be fast because it runs on R* and copies large chunks of data around, rather than optimizing.
Isn't there https://github.com/tidyverse/dtplyr with dplyr syntax but a data.table backend = best of both worlds?