Fixed error in reading fixed_len from parquet

src/io/parquet/read/fixed_size_binary.rs

@@ -78,7 +78,7 @@ pub(crate) fn read_optional(
     values: &mut MutableBuffer<u8>,
     validity: &mut MutableBitmap,
 ) {
-    let length = values.len() * size + additional;
+    let length = values.len() + additional * size;
 
     assert_eq!(values_buffer.len() % size, 0);
     let mut values_iterator = values_buffer.chunks_exact(size);
@@ -89,7 +89,7 @@ pub(crate) fn read_optional(
         match run {
             hybrid_rle::HybridEncoded::Bitpacked(packed) => {
                 // the pack may contain more items than needed.
-                let remaining = length - values.len() * size;
+                let remaining = length * size - values.len();
                 let len = std::cmp::min(packed.len() * 8, remaining);
                 for is_valid in BitmapIter::new(packed, 0, len) {
                     validity.push(is_valid);