Fix clippy

Author: friendlymatthew

datafusion/functions/src/datetime/to_char.rs

@@ -264,7 +264,7 @@ fn _to_char_array(args: &[ColumnarValue]) -> Result<ColumnarValue> {
     let mut results: Vec<Option<String>> = vec![];
     let format_array = arrays[1].as_string::<i32>();
 
-    let mut values = arrays[0].clone();
+    let mut values = Arc::clone(&arrays[0]);
     let mut data_type = arrays[0].data_type();
 
     // eagerly cast Date32 values to Date64 to support date formatting with time-related specifiers