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…

Spatial Joins 1: Local Spatial Joins

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A common type of spatial query involves relating one table of geometric objects (e.g., a table population_centers with columns population, latitude, longitude) with another such table (e.g., a table counties with columns county_name, boundary_wkt), such as calculating for each county the population sum of all population centers contained within it. These kinds of calculations are…