more robust conversion to pyarrow for output

ActivitySim / activitysim

An Open Platform for Activity-Based Travel Modeling

https://activitysim.github.io

BSD 3-Clause "New" or "Revised" License

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Open jpn-- opened 3 months ago

jpn-- commented 3 months ago

This PR adds a few data conversion steps to get rid of "object" type columns when converting to pyarrow.