mix arrow.convert (Arrow v0.1.0)

Converts an Arrow IPC file to the streaming format or vice versa, preserving schema, record batches, and dictionaries.

mix arrow.convert input.arrow output.stream
mix arrow.convert input.stream output.arrow

The input format is auto-detected: IPC files start with the ARROW1 magic, anything else is decoded as a stream. The output is the opposite format by default; pass --to file or --to stream to pick explicitly (e.g. to normalize a stream to a fresh stream). Exits non-zero with a readable message on malformed or unsupported input.