fix clippy

parquet/src/file/serialized_reader.rs

@@ -573,8 +573,8 @@ impl<R: ChunkReader> SerializedPageReader<R> {
     ///
     /// This is used when we need to read parquet with row-filter, and we don't want to decompress the page twice.
     /// This function allows us to check if the next page is being cached or read previously.
-    #[cfg(test)]
-    fn peek_next_page_offset(&mut self) -> Result<Option<usize>> {
+    #[cfg(feature = "async")]
+    pub(crate) fn peek_next_page_offset(&mut self) -> Result<Option<usize>> {
         match &mut self.state {
             SerializedPageReaderState::Values {
                 offset,