sunchao commented on pull request #7176:
URL: https://github.com/apache/arrow/pull/7176#issuecomment-656898683
Just took another look. If we are going with this, we can potentially make
the API simpler. For instance, current it is:
```rust
fn next_row_group(&mut self) -> Result<Box<RowGroupWriter + '_>>;
```
As the returned box already is tracked by non-static lifetime, we can
perhaps change the API to:
```rust
fn next_row_group(&mut self) -> Result<&mut RowGroupWriter>;
```
and track the current group writer within the file writer. With this we can
also potentially remove `close_row_group`. Similar things can be done for
column writer. We can do this in a separate PR though.
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