New features added disallowmissing, allowmissing and categorical functions unstack now accepts renamecols keyword argument Minor changes documentation has been updated to reflect new indexing rules setindex! deprecation warnings were improved and now take into account new rules of broadcasting into 0-row data frames :eltype column in describe now contains a true element type of a data frame column (previously if the type was an union with Missing then the Missing part was stripped, which sometimes lead to user confusion) broadcasting over GroupedDataFrame is now disallowed (it was never intended to work; in the future this might be allowed, but the target design is not decided upon yet) append! now throws ArgumentError instead of ErrorException when column names of appended data frame does not match the target Bug fixes fixed a typo in append! error message fixed a bug in categorical! function when a Colon as column selector was passed (the behavior was inconsistent with the documentation); now only categorical!(::DataFrame) changes columns whose eltype is <:Union{AbstractString, Missing} to categorical; any valid categorical!(::DataFrame, cols) call changes all columns selected by cols to categorical