PERF: 5x speedup for read_json() with orient='index' by avoiding transpose by qwhelan · Pull Request #26773 · pandas-dev/pandas (original) (raw)

nice! @qwhelan mind taking a look at the test cases ( looks like this changes the order of the index ) https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=12630

>   raise_assert_detail(obj, msg, lobj, robj)
E   AssertionError: DataFrame.columns are different
E   
E   DataFrame.columns values are different (100.0 %)
E   [left]:  Index(['A', 'B', 'C', 'D'], dtype='object')
E   [right]: Index(['D', 'C', 'B', 'A'], dtype='object')