Lazy column #7614
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Lazy column #7614
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Same as #7564 but for
Dataset, cc @TopCoder2K FYIe.g.
ds[col]now returns a lazy Column instead of a listThis way calling
ds[col][idx]only loads the required data in memory(bonus: also supports subfields access with
ds[col][subcol][idx])the breaking change will be for the next major release, which also includes removal of dataset scripts support
close #4180