Denodo Joins the Presto Foundation

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We are pleased to announce that Denodo Technologies has joined the Presto Foundation. The Denodo Platform is a popular data management platform based on the concept of data virtualization and logical data models, which includes capabilities for data integration, privacy, governance, and data cataloging. Denodo is often used to implement logical and distributed data architectures…

Common Sub-Expression optimization

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The problem One common pattern we see in some analytical workloads is the repeated use of the same, often times expensive expression. Look at the following query plan for example: The expression JSON_PARSE(features) is used 6 times, and casted to different ROW structures for further processing. Traditionally, Presto would just execute the expression 6 times,…