/swish/pack/rserve_client/prolog/r/r_data.pl
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 r_data_frame_to_dicts(+DataFrame, -Dicts) is det
Translate a DataFrame into a list of dicts, where each dict represents a row. The keys of the dicts are fetched from colnames(DataFrame). For example: 
?- r_data_frame_to_dicts(mtcars, Dicts).
Dicts = [ row{am:1, carb:4, cyl:6, disp:160.0, drat:3.9,
              gear:4, hp:110, mpg:21.0, qsec:16.46, vs:0,
              wt:2.62},
          ...
        ]