Prototype CPU support #52
Description
Legate-dataframe cannot currently run on CPU as it lacks CPU implementations for tasks. libarrow can be used to implement CPU functionality (e.g. csv reading) in the same way libcudf is currently used. libarrow is already a dependancy of legate-dataframe.
A first prototype might contain:
- The ability to convert from a legate-dataframe column to arrow::Array and back.
- 1 task (e.g. read_csv) implmented using libarrow
- A test for this in CI, with a CPU only runner
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