Feat add pivot transform to mo.UI.dataframe #7345 #7584
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## 📝 Summary <!-- Provide a concise summary of what this pull request is addressing. If this PR fixes any issues, list them here by number (e.g., Fixes #123). --> This will make it easier to tackle #7584 <img width="990" height="405" alt="image" src="https://github.com/user-attachments/assets/6ede8d6e-5521-4bd8-8e69-c9fc4d919f30" /> Tested with the affected transforms: - group_by, aggregate, rename, select Also tested with the pivot feature but on the other branch. ## 🔍 Description of Changes <!-- Detail the specific changes made in this pull request. Explain the problem addressed and how it was resolved. If applicable, provide before and after comparisons, screenshots, or any relevant details to help reviewers understand the changes easily. --> ## 📋 Checklist - [x] I have read the [contributor guidelines](https://github.com/marimo-team/marimo/blob/main/CONTRIBUTING.md). - [ ] For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on [Discord](https://marimo.io/discord?ref=pr), or the community [discussions](https://github.com/marimo-team/marimo/discussions) (Please provide a link if applicable). - [x] I have added tests for the changes made. - [x] I have run the code and verified that it works as expected.
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📝 Summary
🔍 Description of Changes
Backend
PivotTransforminmarimo/_plugins/ui/_impl/dataframes/transformsFrontend
PivotTransformSchemawithcolumn_ids, index_column_ids, value_column_ids, aggregationparameters infrontend/src/plugins/impl/data-frames/schema.ts.Added effect to collect unique column values so new column names can be generated on the frontend.frontend/src/plugins/impl/data-frames/panel.ts📋 Checklist