Fix parquet problems (and one with legacy pickle) #3
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Currently index info can get lost after writing to parquet. This PR only supplies schema info for left/right data columns and lets the index be automatically determined. If index is incorrectly assumed by dask to be
"O"and it turns out to beint64an error would be thrown, which is caught by settingschema["__null_dask_index__"] = pa.int64().