diff --git a/datafusion/functions-nested/src/cardinality.rs b/datafusion/functions-nested/src/cardinality.rs
index b577e2aa9df9..a46c5348d123 100644
--- a/datafusion/functions-nested/src/cardinality.rs
+++ b/datafusion/functions-nested/src/cardinality.rs
@@ -75,10 +75,16 @@ impl Cardinality {
     )
 )]
 #[derive(Debug)]
-pub(super) struct Cardinality {
+pub struct Cardinality {
     signature: Signature,
     aliases: Vec<String>,
 }
+
+impl Default for Cardinality {
+    fn default() -> Self {
+        Self::new()
+    }
+}
 impl ScalarUDFImpl for Cardinality {
     fn as_any(&self) -> &dyn Any {
         self
diff --git a/datafusion/functions-nested/src/dimension.rs b/datafusion/functions-nested/src/dimension.rs
index 9933bcf4a4bd..702d0fc3a77d 100644
--- a/datafusion/functions-nested/src/dimension.rs
+++ b/datafusion/functions-nested/src/dimension.rs
@@ -61,11 +61,17 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayDims {
+pub struct ArrayDims {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayDims {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayDims {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/distance.rs b/datafusion/functions-nested/src/distance.rs
index 1f0d31f2e071..8559b1096bc5 100644
--- a/datafusion/functions-nested/src/distance.rs
+++ b/datafusion/functions-nested/src/distance.rs
@@ -67,11 +67,17 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayDistance {
+pub struct ArrayDistance {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayDistance {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayDistance {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/empty.rs b/datafusion/functions-nested/src/empty.rs
index ab205a7cd431..9739ffb15f6b 100644
--- a/datafusion/functions-nested/src/empty.rs
+++ b/datafusion/functions-nested/src/empty.rs
@@ -56,10 +56,16 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayEmpty {
+pub struct ArrayEmpty {
     signature: Signature,
     aliases: Vec<String>,
 }
+
+impl Default for ArrayEmpty {
+    fn default() -> Self {
+        Self::new()
+    }
+}
 impl ArrayEmpty {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/except.rs b/datafusion/functions-nested/src/except.rs
index 1bb5ffd5d36d..356c92983ae2 100644
--- a/datafusion/functions-nested/src/except.rs
+++ b/datafusion/functions-nested/src/except.rs
@@ -67,11 +67,17 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayExcept {
+pub struct ArrayExcept {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayExcept {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayExcept {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/extract.rs b/datafusion/functions-nested/src/extract.rs
index d5b8b5d61935..cce10d2bf6db 100644
--- a/datafusion/functions-nested/src/extract.rs
+++ b/datafusion/functions-nested/src/extract.rs
@@ -102,11 +102,17 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayElement {
+pub struct ArrayElement {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayElement {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayElement {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/map_extract.rs b/datafusion/functions-nested/src/map_extract.rs
index 1ade3f67c973..8ccfae0ff93e 100644
--- a/datafusion/functions-nested/src/map_extract.rs
+++ b/datafusion/functions-nested/src/map_extract.rs
@@ -72,11 +72,17 @@ SELECT map_extract(MAP {'x': 10, 'y': NULL, 'z': 30}, 'y');
     )
 )]
 #[derive(Debug)]
-pub(super) struct MapExtract {
+pub struct MapExtract {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for MapExtract {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MapExtract {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/map_keys.rs b/datafusion/functions-nested/src/map_keys.rs
index d3afce3e402e..74a106bb0c16 100644
--- a/datafusion/functions-nested/src/map_keys.rs
+++ b/datafusion/functions-nested/src/map_keys.rs
@@ -56,10 +56,16 @@ SELECT map_keys(map([100, 5], [42, 43]));
     )
 )]
 #[derive(Debug)]
-pub(crate) struct MapKeysFunc {
+pub struct MapKeysFunc {
     signature: Signature,
 }
 
+impl Default for MapKeysFunc {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MapKeysFunc {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/map_values.rs b/datafusion/functions-nested/src/map_values.rs
index fb3aec009f50..d2fc0a12f9cf 100644
--- a/datafusion/functions-nested/src/map_values.rs
+++ b/datafusion/functions-nested/src/map_values.rs
@@ -60,6 +60,12 @@ pub(crate) struct MapValuesFunc {
     signature: Signature,
 }
 
+impl Default for MapValuesFunc {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MapValuesFunc {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/position.rs b/datafusion/functions-nested/src/position.rs
index f56fdf734c9c..eec2a32fa2a2 100644
--- a/datafusion/functions-nested/src/position.rs
+++ b/datafusion/functions-nested/src/position.rs
@@ -76,10 +76,16 @@ make_udf_expr_and_func!(
     argument(name = "index", description = "Index at which to start searching.")
 )]
 #[derive(Debug)]
-pub(super) struct ArrayPosition {
+pub struct ArrayPosition {
     signature: Signature,
     aliases: Vec<String>,
 }
+
+impl Default for ArrayPosition {
+    fn default() -> Self {
+        Self::new()
+    }
+}
 impl ArrayPosition {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/range.rs b/datafusion/functions-nested/src/range.rs
index cf27c70c2ba8..27cf53041859 100644
--- a/datafusion/functions-nested/src/range.rs
+++ b/datafusion/functions-nested/src/range.rs
@@ -89,10 +89,16 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct Range {
+pub struct Range {
     signature: Signature,
     aliases: Vec<String>,
 }
+
+impl Default for Range {
+    fn default() -> Self {
+        Self::new()
+    }
+}
 impl Range {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/remove.rs b/datafusion/functions-nested/src/remove.rs
index b6031ce733f1..bf7f4746618f 100644
--- a/datafusion/functions-nested/src/remove.rs
+++ b/datafusion/functions-nested/src/remove.rs
@@ -64,11 +64,17 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayRemove {
+pub struct ArrayRemove {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayRemove {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayRemove {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/repeat.rs b/datafusion/functions-nested/src/repeat.rs
index 498781f5b3cc..da0aa5f12fde 100644
--- a/datafusion/functions-nested/src/repeat.rs
+++ b/datafusion/functions-nested/src/repeat.rs
@@ -72,11 +72,17 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayRepeat {
+pub struct ArrayRepeat {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayRepeat {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayRepeat {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/replace.rs b/datafusion/functions-nested/src/replace.rs
index 0902d1d03647..0d3db07c647f 100644
--- a/datafusion/functions-nested/src/replace.rs
+++ b/datafusion/functions-nested/src/replace.rs
@@ -78,11 +78,17 @@ make_udf_expr_and_func!(ArrayReplaceAll,
     argument(name = "to", description = "Final element.")
 )]
 #[derive(Debug)]
-pub(super) struct ArrayReplace {
+pub struct ArrayReplace {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayReplace {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayReplace {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/resize.rs b/datafusion/functions-nested/src/resize.rs
index 8a4a88741c53..a2b95debd206 100644
--- a/datafusion/functions-nested/src/resize.rs
+++ b/datafusion/functions-nested/src/resize.rs
@@ -65,11 +65,17 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayResize {
+pub struct ArrayResize {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayResize {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayResize {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/reverse.rs b/datafusion/functions-nested/src/reverse.rs
index b394c1afeafb..8538ba5cac12 100644
--- a/datafusion/functions-nested/src/reverse.rs
+++ b/datafusion/functions-nested/src/reverse.rs
@@ -58,11 +58,17 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayReverse {
+pub struct ArrayReverse {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayReverse {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayReverse {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/set_ops.rs b/datafusion/functions-nested/src/set_ops.rs
index 893fc933d0c8..70d69170fc1e 100644
--- a/datafusion/functions-nested/src/set_ops.rs
+++ b/datafusion/functions-nested/src/set_ops.rs
@@ -90,11 +90,17 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayUnion {
+pub struct ArrayUnion {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayUnion {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayUnion {
     pub fn new() -> Self {
         Self {
diff --git a/datafusion/functions-nested/src/string.rs b/datafusion/functions-nested/src/string.rs
index ee022053cf71..7fc5e800e2e4 100644
--- a/datafusion/functions-nested/src/string.rs
+++ b/datafusion/functions-nested/src/string.rs
@@ -145,11 +145,17 @@ make_udf_expr_and_func!(
     )
 )]
 #[derive(Debug)]
-pub(super) struct ArrayToString {
+pub struct ArrayToString {
     signature: Signature,
     aliases: Vec<String>,
 }
 
+impl Default for ArrayToString {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ArrayToString {
     pub fn new() -> Self {
         Self {