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I've been using PrestoDB for a few months now, and I'm deeply in love. It's such a well-designed piece of technology. The query execution engine is a tremendous boon to anyone with inconvenient-sized data. And it does most (all?) of ANSI-SQL!

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Spark SQL is actually ANSI SQL.

Plus you can mix and match R, Scala and SQL all together.

I used to use Spark SQL for this purpose, but I've switched. I now use Spark for when I want to transform data. But when I'm writing ad-hoc data exploration/investigation queries, PrestoDB is my jam; it's what it's designed for. Parquet as the data storage method makes both of these quite workable.

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