liyongjing commented on issue #1969:
URL: https://github.com/apache/arrow-rs/issues/1969#issuecomment-1171850627
I call `write` multiple times, call `close` one times using static HashMap.
```rust
fn global() -> &'static Mutex<HashMap<String, Writer>> {
static INSTANCE: OnceCell<Mutex<HashMap<String, Writer>>> =
OnceCell::new();
INSTANCE.get_or_init(|| Mutex::new(HashMap::new()))
}
pub fn write(path: &str, val: Vec<u8>) {
let mut g = global_channel().lock().unwrap();
let w = g.entry(path.to_string()).or_insert(Writer::new(path));
let batch = ...;
w.write(&batch);
}
pub fn close(path: &str) {
let mut g = global_channel().lock().unwrap();
if let Some(v) = g.get_mut(path) {
// *v don't copy
v.close();
}
g.remove(path);
}
```
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