fix format

Signed-off-by: Little-Wallace <[email protected]>

src/storage/src/hummock/sstable/forward_sstable_iterator.rs

@@ -71,6 +71,7 @@ impl SstableIterator {
     }
 
     fn init_block_prefetch_range(&mut self, start_idx: usize) {
+        self.preload_end_block_idx = 0;
         if let Some(bound) = self.options.must_iterated_end_user_key.as_ref() {
             let block_metas = &self.sst.value().meta.block_metas;
             let next_to_start_idx = start_idx + 1;

src/storage/src/hummock/sstable_store.rs

@@ -1242,7 +1242,7 @@ impl BatchBlockStream {
                 Box::new(block.clone()),
                 CachePriority::Low,
             );
-            self.blocks.push_back(Box::new(block.clone()));
+            self.blocks.push_back(Box::new(block));
             buff_offset = end;
             block_idx += 1;
         }

src/storage/src/store.rs

@@ -269,6 +269,8 @@ pub trait LocalStateStore: StaticSendSync {
 
 /// If `prefetch` is true, prefetch will be enabled. Prefetching may increase the memory
 /// footprint of the CN process because the prefetched blocks cannot be evicted.
+/// If `for_large_query` is true, hummock will prefetch the whole object inside the range of this query by a streaming connection.
+/// If `for_large_query` is false, hummock will only read at most 16 blocks in once IO.
 #[derive(Default, Clone, Copy)]
 pub struct PrefetchOptions {
     pub prefetch: bool,