chore: Fix clippy complaints (#3634)

Author: comphead

native/core/benches/parquet_read.rs

@@ -37,7 +37,6 @@ use comet::parquet::util::test_common::page_util::{
 
 use perf::FlamegraphProfiler;
 use rand::{prelude::StdRng, RngExt, SeedableRng};
-use zstd::zstd_safe::WriteBuf;
 
 fn bench(c: &mut Criterion) {
     let expected_num_values: usize = NUM_PAGES * VALUES_PER_PAGE;
@@ -177,7 +176,7 @@ impl TestColumnReader {
     fn load_page(&mut self) {
         if let Some(page) = self.pages.get_next_page().unwrap() {
             let num_values = page.num_values() as usize;
-            let buffer = Buffer::from_slice_ref(page.buffer().as_slice());
+            let buffer = Buffer::from_slice_ref(page.buffer());
             self.inner.set_page_v1(num_values, buffer, page.encoding());
         }
     }

native/core/src/parquet/util/test_common/page_util.rs

@@ -33,7 +33,6 @@ use parquet::{
 
 use super::random_numbers_range;
 use bytes::Bytes;
-use zstd::zstd_safe::WriteBuf;
 
 pub trait DataPageBuilder {
     fn add_rep_levels(&mut self, max_level: i16, rep_levels: &[i16]);
@@ -127,7 +126,7 @@ impl DataPageBuilder for DataPageBuilderImpl {
         let encoded_values = encoder
             .flush_buffer()
             .expect("consume_buffer() should be OK");
-        self.buffer.extend_from_slice(encoded_values.as_slice());
+        self.buffer.extend_from_slice(&encoded_values);
     }
 
     fn add_indices(&mut self, indices: Bytes) {