refactor: preallocate zero offsets in binary compression

Author: bohutang

src/common/native/src/compression/binary/mod.rs

@@ -60,9 +60,9 @@ pub fn compress_binary(
                 offsets.clone()
             } else {
                 let first = offsets.first().unwrap();
-                let mut zero_offsets = Vec::with_capacity(offsets.len());
-                for offset in offsets.iter() {
-                    zero_offsets.push(*offset - *first);
+                let mut zero_offsets = vec![0_u64; offsets.len()];
+                for (idx, offset) in offsets.iter().enumerate() {
+                    zero_offsets[idx] = *offset - *first;
                 }
                 zero_offsets.into()
             };

src/query/service/src/spillers/block_reader.rs

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 use std::collections::VecDeque;
+use std::mem::size_of;
 
 use byteorder::BigEndian;
 use byteorder::ReadBytesExt;