Made sortBy and sortByDesc throw when a column is not found in a group - #2179

Made sortBy and sortByDesc throw when a column is not found in a group#2179

Allex-Nik merged 4 commits into

masterKotlin/dataframe:masterfrom

sort-by-reporting-errors-fixKotlin/dataframe:sort-by-reporting-errors-fixCopy head branch name to clipboard