zebsme commented on issue #15321:
URL: https://github.com/apache/datafusion/issues/15321#issuecomment-2786507752
StreamReader with mmap enabled:
```
fn read_spill(sender: Sender<Result<RecordBatch>>, path: &Path) ->
Result<()> {
let file = File::open(path)?;
let mmap = unsafe { memmap2::Mmap::map(&file)? };
// SAFETY: DataFusion's spill writer strictly follows Arrow IPC
specifications
// with validated schemas and buffers. Skip redundant validation during
read
// to speedup read operation. This is safe for DataFusion as input
guaranteed to be correct when written.
let reader = unsafe {
StreamReader::try_new(Cursor::new(mmap),
None)?.with_skip_validation(true)
};
for batch in reader {
sender
.blocking_send(batch.map_err(Into::into))
.map_err(|e| exec_datafusion_err!("{e}"))?;
}
Ok(())
}
```
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