fix: support arrow datasets containing multiple fragment without row_groups

vaexio / vaex

Out-of-Core hybrid Apache Arrow/NumPy DataFrame for Python, ML, visualization and exploration of big tabular data at a billion rows per second 🚀

https://vaex.io

MIT License

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Closed maartenbreddels closed 2 years ago

maartenbreddels commented 2 years ago

For instance when reading multiple arrow/feather files.

Fixes #2219