Currently, Drill maintains a forked version of Calcite. Because of this, it has been a big headache to rebase onto the latest Calcite master branch every time when Calcite makes a new release.
During today's Drill hangout, we discuss ideas around how to get Drill off the forked Calcite, by either pushing back patches in the forked version to Calcite master branch, or trying to see if those patches are still required for Drill to work properly. There are 49 commits in forked Calcite whose base is Calcite 1.4.0 release [1]. I put a spreadsheet for the current status of those 49 commits, as far as I know [2]. Half of them are the patches that were cherry-picked from Calcite master branch, 9 are just for version change, and the rest requires either push back or re-work in Drill side. I think we probably have to spend considerable effort to get this done ASAP. Otherwise, it will continue to be an issue for Drill. There are two separate work to be done: 1. Continue to rebase forked version onto latest Calcite master (Currently it's 1.5.0) 2. Push the patches in fork to Calcite master. Once all patches are in, we could finally get rid of fork and rebasing efforts. The spreadsheet has a column for sign-up. Thoughts? (let me know if you have problem accessing the spreadsheet). [1] https://github.com/dremio/calcite/tree/DrillCalcite1.4.0 [2] https://docs.google.com/spreadsheets/d/1Z0J5aMCBfqq_9SEl-LXsi_B8Ahaosygqke4cH6pPwmo/edit#gid=0
