*Fields* vs. *columns* usage can be misleading

[blokhin]

client.get_dataframe({"classes": "binary", "years": "2010-2020"}, fields={'S':["phase_id", "entry", "chemical_formula", "superconducting_transition_temperature"]})

leads to

construction.py:985, in _finalize_columns_and_data(content, columns, dtype) 982 columns = _validate_or_indexify_columns(contents, columns) 983 except AssertionError as err: 984 # GH#26429 do not raise user-facing AssertionError --> 985 raise ValueError(err) from err 987 if len(contents) and contents[0].dtype == np.object_: 988 contents = _convert_object_array(contents, dtype=dtype) ValueError: 7 columns passed, passed data had 4 columns

reported by @ltalirz