DictoVec: derive from AbstractVector #96
Merged
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Sometimes R data.frame are constructed such that columns have element names.
RData.jl would then convert these columns into DictoVec object.
However, when converting R data.frame into DataFrames.jl DataFrame object, all column containers are required to support AbstractVector interface.
This PR fixes the failure of DataFrame construction by making DictoVec inherited from AbstractVector and adding necessary methods that are used during DataFrame construction.