Hello, The issue has advanced quite a lot and I guess it will be finalised soon. There is some ongoing discussion about a few naming/refactorings in the PR [1] but these could be resolved easily.
Ruben, had made a proposal which LGTM so I am inclined to merge the PR as soon as the last changes are made (and no other serious issues appear). I guess it is the right time to jump in to the discusion, especially if you strongly disagree on the general approach. [1] https://github.com/apache/calcite/pull/1020 Best, Stamatis
