[tacostakohashi]

If a 'guess' is sufficient, just guess that all the columns are strings.

If that's not correct or good enough, then a guessing is not a sufficient solution for this problem.

[LucianSpec]

yeah, csv type guess is just one of case. i more likely to have a metadata management solution beyond the data lake, maybe Ontotext Refine's goal is what i want, but it's approach from RDF really sucks.