Angelos Charalambidis

[Apache Calcite](https://calcite.apache.org/) features a rule-based optimizer of Relational Algebra. The core idea of the optimizer is to search alternative execution plans by applying transformation rules to the current "best" plan....

EXPLAIN service produce execution plans that are difficult to process. In future releases should support JSON and/or XML serialisation in order to easily integrate and consumed by a frontend.

Consider separate the webgui module from the main semagrow repo since: 1. It seems that this module is in large extend a generic sparql query ui 2. Updates of the...

Currently the metadata of all endpoints in the federation are in a single turtle file expressed in SeVod (an extension of VoID). It would be useful to provide the flexibility...

Current configuration lies in `/etc/semagrow/repository.ttl` and `/etc/semagrow/metadata.ttl` If configuration changed in these files semagrow needs to be restarted in order to apply the changes. However, it is useful to provide...