Julia Feather.read failed to read feather file on CentOS.

[BoPeng]

For dataframe sos-julia essentially saves the dataframe in feather format and use Julia's Feather.read function to read it. Unfortunately, this does not seem to work under CentOS 7 as shown above.

All other tests pass on CentOS so Feather.read is the only problem.

@mathieuboudreau Could you in your travis docker environment test if julia's Feather.read can read files written by feather.write_dataframe?

[BoPeng]

SoS (Python) can read feather file written by Julia.

[BoPeng]

Some dataframes actually work

[BoPeng]

According to pandas.to_feather, feather does not support non-default index and numeric column names, so at least in this case we should force string column names?

[BoPeng]

The problem here is that python feather writes in the feather v2 (arrow) format and Feather.jl cannot yet read it.

JuliaData/Feather.jl#139