DataFrame enhancements

I see dozens of issues and enhancement suggestions for DataFrame in Microsoft.Data.Analysis namespace untouched for almost a year.
Are there any resources allocated to address those?
Is the project dead?
Are there any plans to fund the work on those features in the future?
Should we base any future development on these?

Specific enhancements desired:
- Array/VBuffer column types
- Sort by multiple columns
- GroupBy by multiple columns
- Parquet read/Write (currently the [ParquetSharp.DataFrame](https://github.com/G-Research/ParquetSharp.DataFrame) has some limited support)