Bin Wang

Currently the `ParquetFileWriter` cannot handle table with parquet columns. Due to the following reasons 1. Parquet has a [`Interval`](https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#interval) logical type which has the same meaning of Hillview `Duration`, but...

In Ch20, `BufReader` is initialized using mutable borrow of `TcpStream` unnecessarily

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- I have searched open and closed issues and pull requests for duplicates, using these search terms: - `BufReader` - I have checked the latest `main` branch to see if...