[GitHub] [arrow-rs] Dandandan commented on a change in pull request #384: Implement faster arrow array reader

[GitBox <gi...@apache.org>]

Dandandan commented on a change in pull request #384:
URL: https://github.com/apache/arrow-rs/pull/384#discussion_r642802751



##########
File path: parquet/src/util/memory.rs
##########
@@ -292,19 +292,28 @@ impl<T> BufferPtr<T> {
     }
 
     /// Returns slice of data in this buffer.
+    #[inline]
     pub fn data(&self) -> &[T] {
         &self.data[self.start..self.start + self.len]
     }
 
     /// Updates this buffer with new `start` position and length `len`.
     ///
     /// Range should be within current start position and length.
+    #[inline]
     pub fn with_range(mut self, start: usize, len: usize) -> Self {
-        assert!(start <= self.len);
-        assert!(start + len <= self.len);
+        self.set_range(start, len);
+        self
+    }
+
+    /// Updates this buffer with new `start` position and length `len`.
+    ///
+    /// Range should be within current start position and length.
+    #[inline]
+    pub fn set_range(&mut self, start: usize, len: usize) {
+        assert!(self.start <= start && start + len <= self.start + self.len);

Review comment:
       Ah I had the `self.start` and `start` swapped in my head




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