Presto Enables Internal Log Data Analysis at Drift

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I’m a Senior Software Engineer in the data group at Drift, a conversational marketing platform that is used for qualifying leads faster, automatically booking meetings and connecting customers to the right business solutions more efficiently. I’ve used Presto quite a bit throughout my career, and I want to first give readers a quick overview of…

Even Faster Unnest

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Unnest is a common operation in Facebook’s daily Presto workload. It converts an ARRAY, MAP, or ROW into a flat relation. Its original implementation used deep copy all the time and was very inefficient. In Unnest Operator Performance Enhancement with Dictionary Blocks, the author improved the Unnest operator by up to 10x in CPU and…