refactor: make structs public and implement Default trait (#14030)

Author: dharanad

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

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 {

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 {

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 {

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 {

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 {

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 {

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 {

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 {

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 {