fix: bvector subscription may modify padding bits (#401)

* fix: bvector subscription may modify padding bits

Signed-off-by: Mingzhuo Yin <yinmingzhuo@gmail.com>

* cargo clippy

Signed-off-by: Mingzhuo Yin <yinmingzhuo@gmail.com>

---------

Signed-off-by: Mingzhuo Yin <yinmingzhuo@gmail.com>

Author: silver-ymz

src/datatype/subscript_bvecf32.rs

@@ -168,9 +168,9 @@ fn _vectors_bvecf32_subscript(_fcinfo: pgrx::pg_sys::FunctionCallInfo) -> Datum
                 if start % BVEC_WIDTH as u16 == 0 {
                     let start_idx = start as usize / BVEC_WIDTH;
                     let end_idx = (end as usize).div_ceil(BVEC_WIDTH);
-                    values
-                        .data_mut()
-                        .copy_from_slice(&input.for_borrow().data()[start_idx..end_idx]);
+                    let slice = values.data_mut();
+                    slice.copy_from_slice(&input.for_borrow().data()[start_idx..end_idx]);
+                    slice[end_idx - start_idx - 1] &= (1 << (end as usize % BVEC_WIDTH)) - 1;
                 } else {
                     let mut i = 0;
                     let mut j = start as usize;