If you are interested in this, but would prefer to define reports with a markup language (and SQL), I work on an open source code-based BI tool called Evidence, which might be of interest to you.
It's effectively a static site generator aimed at building automated reports and analysis.
It's effectively a static site generator aimed at building automated reports and analysis.
https://github.com/evidence-dev/evidence
Previous discussions on HN:
https://news.ycombinator.com/item?id=28304781 - 91 comments
https://news.ycombinator.com/item?id=35645464 - 97 comments