Dandandan commented on code in PR #5161:
URL: https://github.com/apache/arrow-datafusion/pull/5161#discussion_r1097183956
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datafusion/core/src/physical_plan/file_format/file_stream.rs:
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@@ -98,6 +99,8 @@ enum FileStreamState {
partition_values: Vec<ScalarValue>,
/// The reader instance
reader: BoxStream<'static, Result<RecordBatch, ArrowError>>,
+ /// A [`FileOpenFuture`] for the next file to be processed
+ next: Option<(FileOpenFuture, Vec<ScalarValue>)>,
Review Comment:
I wonder if we could make it future-proof by potentially prefetching `n`
files instead of 1? I guess in cases where file opening is slower than scanning
/ processing, this could make a difference (e.g. small files).
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