feat: add DataFusionFormatter#9338
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Light2Dark
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Apr 23, 2026
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Would you want to add tests? Under test_formatters
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Pull request overview
Adds first-class formatting support for Apache DataFusion DataFrame objects so they render deterministically in marimo (instead of blank/erroring), aligning DataFusion with other supported dataframe engines.
Changes:
- Introduces
DataFusionFormatterwith an opinionated formatter that renders viamarimo’s interactivetable. - Registers
DataFusionFormatterin the third-party formatter factory map so it activates whendatafusionis imported.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| marimo/_output/formatters/formatters.py | Registers the new DataFusion formatter factory for import-time activation. |
| marimo/_output/formatters/df_formatters.py | Implements DataFusionFormatter using Arrow conversion + table(...) rendering with fallback logging. |
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Light2Dark
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Apr 23, 2026
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📝 Summary
Datafusion previously didn't have a formatter so showing the dataframe was undefined (blank on local, an error on molab).
Closes #9337
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