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Update README
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README.md

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@@ -37,7 +37,7 @@ To that end, we're trying to support CSV, JSON, and perhaps other simpler file f
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**Note on Feather:** The Feather file format support can be considered as deprecated in favour of Arrow IPC. Though we have implemented Feather, it's meant to be a stop-gap measure until Arrow supports IPC (in Rust). We'll try tackle this in the coming months.
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- IO Support
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- [ ] CSV
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- [X] CSV (using Arrow)
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- [X] Read
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- [X] Write
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- [ ] JSON
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### Functionality
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- DataFrame Operations
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<!-- - [x] Read CSV into dataframe -->
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- [X] Select single column
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- [X] Select subset of columns, drop columns
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- [X] Add or remove columns
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- [X] Rename columns
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- [ ] Create dataframe from record batches (a `Vec<RecordBatch>` as well as an iterator)
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- [X] Write dataframe to CSV (and other formats as and when Arrow supports them)
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- [ ] Sort dataframes
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- [ ] Grouped operations
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- [ ] Filter dataframes

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