Avoid a clone when creating FixedSizeListArray from ArrayData

Author: alamb

arrow-array/src/array/fixed_size_list_array.rs

@@ -429,8 +429,10 @@ impl FixedSizeListArray {
 
 impl From<ArrayData> for FixedSizeListArray {
     fn from(data: ArrayData) -> Self {
-        let value_length = match data.data_type() {
-            DataType::FixedSizeList(_, len) => *len,
+        let (data_type, len, nulls, offset, _buffers, child_data) = data.into_parts();
+
+        let value_length = match data_type {
+            DataType::FixedSizeList(_, len) => len,
             data_type => {
                 panic!(
                     "FixedSizeListArray data should contain a FixedSizeList data type, got {data_type}"
@@ -439,14 +441,13 @@ impl From<ArrayData> for FixedSizeListArray {
         };
 
         let size = value_length as usize;
-        let values =
-            make_array(data.child_data()[0].slice(data.offset() * size, data.len() * size));
+        let values = make_array(child_data[0].slice(offset * size, len * size));
         Self {
-            data_type: data.data_type().clone(),
+            data_type,
             values,
-            nulls: data.nulls().cloned(),
+            nulls,
             value_length,
-            len: data.len(),
+            len,
         }
     }
 }