zhuqi-lucas commented on code in PR #7714:
URL: https://github.com/apache/arrow-rs/pull/7714#discussion_r2159029611
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parquet/src/arrow/arrow_writer/mod.rs:
##########
@@ -320,14 +320,21 @@ impl<W: Write + Send> ArrowWriter<W> {
}
/// Returns a reference to the underlying writer.
+ ///
+ /// **Warning**: if you write directly to this writer, you will skip
Review Comment:
Thank you @alamb for review, because the failed example use the inner() to
call write_all(), so i also add warning here, here is the failed example:
https://github.com/apache/datafusion/pull/16395#discussion_r2148133565
The low level we called by inner(), it has write_all api:
```rust
impl<W: Write> BufWriter<W> {
#[inline]
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
// Use < instead of <= to avoid a needless trip through the buffer
in some cases.
// See `write_all_cold` for details.
if buf.len() < self.spare_capacity() {
// SAFETY: safe by above conditional.
unsafe {
self.write_to_buffer_unchecked(buf);
}
Ok(())
} else {
self.write_all_cold(buf)
}
}
...
```
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