discivigour commented on code in PR #230:
URL: https://github.com/apache/paimon-rust/pull/230#discussion_r3055905344
##########
crates/paimon/src/arrow/format/parquet.rs:
##########
@@ -783,11 +783,33 @@ fn build_row_ranges_selection(
struct ArrowFileReader {
file_size: u64,
r: Box<dyn FileRead>,
+ /// Maximum gap (in bytes) between two ranges that will be merged into a
+ /// single fetch request. Defaults to 1 MiB.
+ range_coalesce_bytes: u64,
+ /// Maximum number of merged ranges to fetch concurrently. Defaults to 8.
+ range_fetch_concurrency: usize,
+ /// Hint for the number of bytes to speculatively read from the end of the
+ /// file when loading Parquet metadata. A sufficiently large hint reduces
+ /// footer loading from 2 round-trips to 1. Defaults to 512 KiB.
+ metadata_size_hint: Option<usize>,
}
+/// Default coalesce threshold: 1 MiB.
+const DEFAULT_RANGE_COALESCE_BYTES: u64 = 1024 * 1024;
+/// Default concurrent range fetches.
+const DEFAULT_RANGE_FETCH_CONCURRENCY: usize = 8;
Review Comment:
changed.
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