Our Presto Credo for the Truly Open Source SQL Query Engine

By ,  & 

We believe that data analytics should be democratized—and is why we innovate Presto with state-of-the-art database technology. Trusted governance is important to us—and is why we model our project governance and by laws after the Linux Foundation. TO OUR FELLOW DATA ENGINEERS, SOFTWARE DEVELOPERS, AND DATA PLATFORM ENTHUSIASTS: As the use of data analytics and…

Even Faster Unnest

By ,  & 

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…