tustvold commented on code in PR #1803:
URL: https://github.com/apache/arrow-rs/pull/1803#discussion_r890464300
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parquet/src/arrow/async_reader.rs:
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@@ -101,8 +103,63 @@ use crate::file::footer::parse_metadata_buffer;
use crate::file::metadata::ParquetMetaData;
use crate::file::reader::SerializedPageReader;
use crate::file::PARQUET_MAGIC;
-use crate::schema::types::{ColumnDescPtr, SchemaDescPtr};
-use crate::util::memory::ByteBufferPtr;
+use crate::schema::types::{ColumnDescPtr, SchemaDescPtr, SchemaDescriptor};
+
+/// A reader that can asynchronously read a range of bytes
+pub trait AsyncChunkReader: Send + Unpin + 'static {
+ /// Retrieve the bytes in `range`
+ fn get_bytes(&mut self, range: Range<usize>) -> BoxFuture<'_,
Result<Bytes>>;
+
+ /// Retrieve the [`ParquetMetaData`] for this file
+ fn get_metadata(&mut self) -> BoxFuture<'_, Result<Arc<ParquetMetaData>>>;
+}
+
+impl<T: AsyncRead + AsyncSeek + Unpin + Send + 'static> AsyncChunkReader for T
{
+ fn get_bytes(&mut self, range: Range<usize>) -> BoxFuture<'_,
Result<Bytes>> {
+ async move {
+ self.seek(SeekFrom::Start(range.start as u64)).await?;
Review Comment:
The method takes a mutable reference, so they can't race
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