jiangzhx commented on code in PR #5860:
URL: https://github.com/apache/arrow-datafusion/pull/5860#discussion_r1160422312
##########
datafusion/core/src/datasource/file_format/file_type.rs:
##########
@@ -111,6 +115,58 @@ impl FileCompressionType {
self.variant.is_compressed()
}
+ /// Given a `Stream`, create a `Stream` which data are decompressed with
`FileCompressionType`.
+ pub fn convert_to_compress_stream<
+ T: Stream<Item = Result<Bytes>> + Unpin + Send + 'static,
+ >(
+ &self,
+ s: T,
+ ) -> Result<Box<dyn Stream<Item = Result<Bytes>> + Send + Unpin>> {
+ #[cfg(feature = "compression")]
+ let err_converter = |e: std::io::Error| match e
+ .get_ref()
+ .and_then(|e| e.downcast_ref::<DataFusionError>())
+ {
+ Some(_) => {
+ *(e.into_inner()
+ .unwrap()
+ .downcast::<DataFusionError>()
+ .unwrap())
Review Comment:
I think it's fine.
Because err_converter only accepts std::io::Error type as input, and
DataFusionError has also implemented it accordingly.
https://github.com/apache/arrow-datafusion/blob/fe46a1ed9833f2f9ea4c4ccd4d77718e5c371ab1/datafusion-common/src/error.rs#L78-L82
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