Robust Query Planning for Federated Queries
In our previous blog post, we discussed some of the challenges when it comes to querying heterogeneous federations. In this blog post, we want to focus specifically on the challenge of estimating the number of (intermediate) results in federated settings and present our new robust query planning feature to address this challenge. In federations with Virtual Graphs, SPARQL endpoints, or other remote sources, it is difficult to estimate the number of results (i.