alamb commented on code in PR #7962:
URL: https://github.com/apache/arrow-datafusion/pull/7962#discussion_r1379304130
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datafusion/core/src/datasource/file_format/arrow.rs:
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@@ -99,7 +102,177 @@ impl FileFormat for ArrowFormat {
}
}
-fn read_arrow_schema_from_reader<R: Read + Seek>(reader: R) ->
Result<SchemaRef> {
- let reader = FileReader::try_new(reader, None)?;
- Ok(reader.schema())
+const ARROW_MAGIC: [u8; 6] = [b'A', b'R', b'R', b'O', b'W', b'1'];
+const CONTINUATION_MARKER: [u8; 4] = [0xff; 4];
+
+async fn infer_schema_from_file_stream(
Review Comment:
```suggestion
/// Custom implementation of inferring schema. Should eventually be moved
upstream to arrow-rs.
/// See https://github.com/apache/arrow-rs/issues/5021
async fn infer_schema_from_file_stream(
```
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