xbattlax commented on issue #1958:
URL: https://github.com/apache/iceberg-rust/issues/1958#issuecomment-3737419084
+1 for Option A.
At iceberg scale, giving up runtime control means giving up performance
that matters when processing petabytes.
Suggested approach - zero-cost default with opt-in flexibility:
```
#[cfg(not(feature = "custom-runtime"))]
pub use tokio_runtime::*;
#[cfg(feature = "custom-runtime")]
pub trait Runtime: Send + Sync + 'static { ... }
```
Default path gets Tokio direct calls with no boxing overhead. Custom path
pays the trait cost only when needed.
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