Refactor to keep ui

Signed-off-by: Chojan Shang <[email protected]>

Author: PsiACE

datafusion/functions/src/string/chr.rs

@@ -16,7 +16,6 @@
 // under the License.
 
 use std::any::Any;
-use std::iter;
 use std::sync::Arc;
 
 use arrow::array::ArrayRef;

datafusion/functions/src/string/mod.rs

@@ -62,8 +62,8 @@ pub mod expr_fn {
     }
 
     #[doc = "Returns the number of bits in the `string`"]
-    pub fn bit_length(args: Vec<Expr>) -> Expr {
-        super::bit_length().call(args)
+    pub fn bit_length(arg: Expr) -> Expr {
+        super::bit_length().call(vec![arg])
     }
 
     #[doc = "Removes all characters, spaces by default, from both sides of a string"]
@@ -72,8 +72,8 @@ pub mod expr_fn {
     }
 
     #[doc = "Converts the Unicode code point to a UTF8 character"]
-    pub fn chr(args: Vec<Expr>) -> Expr {
-        super::chr().call(args)
+    pub fn chr(arg: Expr) -> Expr {
+        super::chr().call(vec![arg])
     }
 
     #[doc = "Returns the Levenshtein distance between the two given strings"]