Jefffrey commented on code in PR #5860:
URL: https://github.com/apache/arrow-datafusion/pull/5860#discussion_r1160340764
##########
datafusion/core/src/datasource/file_format/csv.rs:
##########
@@ -124,8 +154,13 @@ impl FileFormat for CsvFormat {
let mut records_to_read =
self.schema_infer_max_rec.unwrap_or(usize::MAX);
for object in objects {
- // stream to only read as many rows as needed into memory
- let stream = read_to_delimited_chunks(store, object).await;
+ let stream = store.get(&object.location).await.unwrap();
Review Comment:
safe unwrap?
##########
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:
safe unwraps?
##########
datafusion-examples/examples/csv_sql.rs:
##########
@@ -48,5 +49,22 @@ async fn main() -> Result<()> {
// print the results
df.show().await?;
+ // query with
Review Comment:
expand on this comment a bit? seems it was cutoff, so like `query compressed
CSV with specific options` etc.
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