What features will I miss in Julia?

You could check on https://pkg.julialang.org and find the Feather package. Notice that it is owned by the JuliaStats organization, which is a good place to start looking for Julia packages related to statistical computing.

Also, check the recent announcement of JuliaDB. This is a step forward relative to other systems for manipulating and processing large amounts of tabular data. The purpose of Julia isn’t to imitate the capabilities in Python or R or Matlab and stop there. It is to design novel and effective software to solve real-world problems.

If you want to continue a discussion of the laundry list of capabilities that must be provided for you before you are willing to consider using a system, you may want to consider commercial software.

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