I think that really sums it up. The other issue I've seen is lacking documentation. I've been a Drill committer for several years and co-authored the O'Reilly

I think that really sums it up. The other issue I've seen is lacking documentation. I've been a Drill committer for several years and co-authored the O'Reilly book, Learning Apache Drill. I'm STILL finding undocumented functionality in Drill.