nit: avoid clone in RunArray row decoding via buffer stealing

lyang24 · lyang24 · commit 345d392f4b06 · 2025-12-28T20:44:52.000+09:00
Signed-off-by: lyang24 &lt;lanqingy93@gmail.com&gt;
diff --git a/arrow-row/src/run.rs b/arrow-row/src/run.rs
@@ -134,7 +134,8 @@ pub unsafe fn decode<R: RunEndIndexType>(
                 run_ends.push(R::Native::usize_as(idx));
             }
             unique_row_indices.push(decoded_values.len());
-            decoded_values.push(decoded_data.clone());
+            let capacity = decoded_data.capacity();
+            decoded_values.push(std::mem::replace(&mut decoded_data, Vec::with_capacity(capacity)));
         }
     }
     // Add the final run end

Original file line number	Diff line number	Diff line change
`@@ -134,7 +134,8 @@ pub unsafe fn decode<R: RunEndIndexType>(`
`134`	`134`	`run_ends.push(R::Native::usize_as(idx));`
`135`	`135`	`}`
`136`	`136`	`unique_row_indices.push(decoded_values.len());`
`137`		`- decoded_values.push(decoded_data.clone());`
	`137`	`+ let capacity = decoded_data.capacity();`
	`138`	`+ decoded_values.push(std::mem::replace(&mut decoded_data, Vec::with_capacity(capacity)));`
`138`	`139`	`}`
`139`	`140`	`}`
`140`	`141`	`// Add the final run end`