2
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If I have a 2-column dataset like:

How do I make a BarChart in the obvious way (i.e., bars labeled by FileName, in this case)?

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2
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Several ways to do it:

dataset[BarChart[Labeled[#, Rotate[#2, 90 Degree], Axis]&@@@#]&,{"FileSize", "FileName"}]

dataset[BarChart[#[[All, 1]], ChartLabels -> (Rotate[#, 90 Degree]& /@ #[[All,2]])]&, 
  {"FileSize", "FileName"}]

dataset // Query[BarChart[#[[All, 1]], 
   ChartLabels -> (Rotate[#, 90 Degree]& /@ #[[All,2]])]&, {"FileSize", "FileName"}]

BarChart[#, ChartLabels -> Placed[#2, Axis, Rotate[#, 90 Degree]&]]& @@ 
  dataset[Transpose, {"FileSize", "FileName"}]
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  • $\begingroup$ It turns out this causes collision in the BarChart due to outliers: here. Is there a way to account for this? Maybe only the top few files can be shown cleanly? $\endgroup$ – George Jul 19 at 21:16
  • $\begingroup$ @George, does ScalingFunctions->"Log" (in BarChart) help? $\endgroup$ – kglr Jul 19 at 21:22
  • $\begingroup$ A bit but there's still considerable collision in the labeling. $\endgroup$ – George Jul 19 at 21:37
  • $\begingroup$ you can use dataset[BarChart[Labeled[#, Rotate[#2, 90 Degree], Axis]& @@@ #]&, {"FileSize","FileName"}] to have the labels rotated. $\endgroup$ – kglr Jul 19 at 21:52
  • $\begingroup$ kglr: That worked! Is there a way to make the y-axis have units in Mb instead of bytes? $\endgroup$ – George Jul 19 at 23:04

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