RangeIndex not generated with pd.concat with ignore_index as True · Issue #12695 · pandas-dev/pandas (original) (raw)

With version 0.18.0 introducing RangeIndex, should RangeIndex be applied for concat when ignore_index is set to True?

df = pd.concat([df_a, df_b], ignore_index=True)

df.index is an instance of Int64Index, not RangeIndex currently in 0.18.0