Minor: Remove clone in transform_to_states (#12707)

* rm clone

Signed-off-by: jayzhan211 <jayzhan211@gmail.com>

* fmt

Signed-off-by: jayzhan211 <jayzhan211@gmail.com>

---------

Signed-off-by: jayzhan211 <jayzhan211@gmail.com>

datafusion/physical-plan/src/aggregates/row_hash.rs

@@ -38,7 +38,7 @@ use crate::{RecordBatchStream, SendableRecordBatchStream};
 use arrow::array::*;
 use arrow::datatypes::SchemaRef;
 use arrow_schema::SortOptions;
-use datafusion_common::{internal_datafusion_err, DataFusionError, Result};
+use datafusion_common::{internal_err, DataFusionError, Result};
 use datafusion_execution::disk_manager::RefCountedTempFile;
 use datafusion_execution::memory_pool::proxy::VecAllocExt;
 use datafusion_execution::memory_pool::{MemoryConsumer, MemoryReservation};
@@ -1081,13 +1081,14 @@ impl GroupedHashAggregateStream {
 
     /// Transforms input batch to intermediate aggregate state, without grouping it
     fn transform_to_states(&self, batch: RecordBatch) -> Result<RecordBatch> {
-        let group_values = evaluate_group_by(&self.group_by, &batch)?;
+        let mut group_values = evaluate_group_by(&self.group_by, &batch)?;
         let input_values = evaluate_many(&self.aggregate_arguments, &batch)?;
         let filter_values = evaluate_optional(&self.filter_expressions, &batch)?;
 
-        let mut output = group_values.first().cloned().ok_or_else(|| {
-            internal_datafusion_err!("group_values expected to have at least one element")
-        })?;
+        if group_values.len() != 1 {
+            return internal_err!("group_values expected to have single element");
+        }
+        let mut output = group_values.swap_remove(0);
 
         let iter = self
             .accumulators