How about adding a 'Save as arrow file' button? DOM.download(() => new Blob([bytes], {type: "octet/stream"}), 'data.arrow', "Save as Arrow file"); I tried and saved above at table, but upon reading it in R with read_ipc_stream, i get an error : ''Cannot convert Dictionary Array of type `dictionary<values=string, indices=uint32, ordered=0>` to R" Looking at https://github.com/apache/arrow/blob/757e50e43c18d88365d1225854f23099649755c9/r/src/array_to_vector.cpp lines 547+, it appears that UINT32 is not yet supported in R for dictionary indices (but INT32 is)

Thanks for the suggestion, I've added it to the notebook! I also released arquero-arrow v0.1.1 which now uses Int32 dictionary indices. If you have a chance to test in R, please file issues as needed on the arquero-arrow repo.