adamreeve commented on code in PR #8162:
URL: https://github.com/apache/arrow-rs/pull/8162#discussion_r2361511303
##########
parquet/src/arrow/arrow_writer/mod.rs:
##########
@@ -426,6 +428,15 @@ impl<W: Write + Send> ArrowWriter<W> {
row_group_writer.close()?;
Ok(())
}
+
+ /// Converts this writer into a lower-level [`SerializedFileWriter`] and
[`ArrowRowGroupWriterFactory`].
Review Comment:
> I spent quite a while trying to figure out why we can't just use
get_column_writers.
Sorry, I realise now that I didn't make this very clear in my original issue
(#7359).
One other factor is that we couldn't just use the `WriterProperties` passed
to `get_column_writers` to internally create a new `FileEncryptor`. When a
`FileEncryptor` is
[created](https://github.com/apache/arrow-rs/blob/30a779878a617116afe73e48ac05abfff0040c6f/parquet/src/file/writer.rs#L187)
for the `SerializedFileWriter`, it [generates random
AAD](https://github.com/apache/arrow-rs/blob/11158ba8cfc471354ed14d04c88c9c631143459a/parquet/src/encryption/encrypt.rs#L302)
(additional authentication data), and this AAD has to be the same for all
encrypted modules in the file.
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