alamb commented on code in PR #8414:
URL: https://github.com/apache/arrow-datafusion/pull/8414#discussion_r1418002465


##########
datafusion/common/src/scalar.rs:
##########
@@ -1368,103 +1366,36 @@ impl ScalarValue {
             }};
         }
 
-        macro_rules! build_array_list_primitive {
-            ($ARRAY_TY:ident, $SCALAR_TY:ident, $NATIVE_TYPE:ident, 
$LIST_TY:ident, $SCALAR_LIST:pat) => {{
-                Ok::<ArrayRef, 
DataFusionError>(Arc::new($LIST_TY::from_iter_primitive::<$ARRAY_TY, _, _>(
-                    scalars.into_iter().map(|x| match x{
-                        ScalarValue::List(arr) if matches!(x, $SCALAR_LIST) => 
{
-                            // `ScalarValue::List` contains a single element 
`ListArray`.
-                            let list_arr = as_list_array(&arr);
-                            if list_arr.is_null(0) {
-                                Ok(None)
-                            } else {
-                                let primitive_arr =
-                                    
list_arr.values().as_primitive::<$ARRAY_TY>();
-                                Ok(Some(
-                                    
primitive_arr.into_iter().collect::<Vec<Option<_>>>(),
-                                ))
-                            }
-                        }
-                        ScalarValue::LargeList(arr) if matches!(x, 
$SCALAR_LIST) =>{
-                            // `ScalarValue::List` contains a single element 
`ListArray`.
-                            let list_arr = as_large_list_array(&arr);
-                            if list_arr.is_null(0) {
-                                Ok(None)
-                            } else {
-                                let primitive_arr =
-                                    
list_arr.values().as_primitive::<$ARRAY_TY>();
-                                Ok(Some(
-                                    
primitive_arr.into_iter().collect::<Vec<Option<_>>>(),
-                                ))
-                            }
-                        }
-                        sv => _internal_err!(
-                            "Inconsistent types in ScalarValue::iter_to_array. 
\
-                                Expected {:?}, got {:?}",
-                            data_type, sv
-                        ),
-                    })
-                    .collect::<Result<Vec<_>>>()?,
-                )))
-            }};
-        }
-
-        macro_rules! build_array_list_string {
-            ($BUILDER:ident, 
$STRING_ARRAY:ident,$LIST_BUILDER:ident,$SCALAR_LIST:pat) => {{
-                let mut builder = $LIST_BUILDER::new($BUILDER::new());
-                for scalar in scalars.into_iter() {
-                    match scalar {
-                        ScalarValue::List(arr) if matches!(scalar, 
$SCALAR_LIST) => {
-                            // `ScalarValue::List` contains a single element 
`ListArray`.
-                            let list_arr = as_list_array(&arr);
-
-                            if list_arr.is_null(0) {
-                                builder.append(false);
-                                continue;
-                            }
-
-                            let string_arr = $STRING_ARRAY(list_arr.values());
-
-                            for v in string_arr.iter() {
-                                if let Some(v) = v {
-                                    builder.values().append_value(v);
-                                } else {
-                                    builder.values().append_null();
-                                }
-                            }
-                            builder.append(true);
-                        }
-                        ScalarValue::LargeList(arr) if matches!(scalar, 
$SCALAR_LIST) => {
-                            // `ScalarValue::List` contains a single element 
`ListArray`.
-                            let list_arr = as_large_list_array(&arr);
-
-                            if list_arr.is_null(0) {
-                                builder.append(false);
-                                continue;
-                            }
-
-                            let string_arr = $STRING_ARRAY(list_arr.values());
-
-                            for v in string_arr.iter() {
-                                if let Some(v) = v {
-                                    builder.values().append_value(v);
-                                } else {
-                                    builder.values().append_null();
-                                }
-                            }
-                            builder.append(true);
-                        }
-                        sv => {
-                            return _internal_err!(
-                                "Inconsistent types in 
ScalarValue::iter_to_array. \
-                                    Expected List, got {:?}",
-                                sv
-                            )
-                        }
-                    }
+        fn build_list_array(

Review Comment:
   You are right



##########
datafusion/common/src/scalar.rs:
##########
@@ -1368,103 +1366,36 @@ impl ScalarValue {
             }};
         }
 
-        macro_rules! build_array_list_primitive {
-            ($ARRAY_TY:ident, $SCALAR_TY:ident, $NATIVE_TYPE:ident, 
$LIST_TY:ident, $SCALAR_LIST:pat) => {{
-                Ok::<ArrayRef, 
DataFusionError>(Arc::new($LIST_TY::from_iter_primitive::<$ARRAY_TY, _, _>(
-                    scalars.into_iter().map(|x| match x{
-                        ScalarValue::List(arr) if matches!(x, $SCALAR_LIST) => 
{
-                            // `ScalarValue::List` contains a single element 
`ListArray`.
-                            let list_arr = as_list_array(&arr);
-                            if list_arr.is_null(0) {
-                                Ok(None)
-                            } else {
-                                let primitive_arr =
-                                    
list_arr.values().as_primitive::<$ARRAY_TY>();
-                                Ok(Some(
-                                    
primitive_arr.into_iter().collect::<Vec<Option<_>>>(),
-                                ))
-                            }
-                        }
-                        ScalarValue::LargeList(arr) if matches!(x, 
$SCALAR_LIST) =>{
-                            // `ScalarValue::List` contains a single element 
`ListArray`.
-                            let list_arr = as_large_list_array(&arr);
-                            if list_arr.is_null(0) {
-                                Ok(None)
-                            } else {
-                                let primitive_arr =
-                                    
list_arr.values().as_primitive::<$ARRAY_TY>();
-                                Ok(Some(
-                                    
primitive_arr.into_iter().collect::<Vec<Option<_>>>(),
-                                ))
-                            }
-                        }
-                        sv => _internal_err!(
-                            "Inconsistent types in ScalarValue::iter_to_array. 
\
-                                Expected {:?}, got {:?}",
-                            data_type, sv
-                        ),
-                    })
-                    .collect::<Result<Vec<_>>>()?,
-                )))
-            }};
-        }
-
-        macro_rules! build_array_list_string {
-            ($BUILDER:ident, 
$STRING_ARRAY:ident,$LIST_BUILDER:ident,$SCALAR_LIST:pat) => {{
-                let mut builder = $LIST_BUILDER::new($BUILDER::new());
-                for scalar in scalars.into_iter() {
-                    match scalar {
-                        ScalarValue::List(arr) if matches!(scalar, 
$SCALAR_LIST) => {
-                            // `ScalarValue::List` contains a single element 
`ListArray`.
-                            let list_arr = as_list_array(&arr);
-
-                            if list_arr.is_null(0) {
-                                builder.append(false);
-                                continue;
-                            }
-
-                            let string_arr = $STRING_ARRAY(list_arr.values());
-
-                            for v in string_arr.iter() {
-                                if let Some(v) = v {
-                                    builder.values().append_value(v);
-                                } else {
-                                    builder.values().append_null();
-                                }
-                            }
-                            builder.append(true);
-                        }
-                        ScalarValue::LargeList(arr) if matches!(scalar, 
$SCALAR_LIST) => {
-                            // `ScalarValue::List` contains a single element 
`ListArray`.
-                            let list_arr = as_large_list_array(&arr);
-
-                            if list_arr.is_null(0) {
-                                builder.append(false);
-                                continue;
-                            }
-
-                            let string_arr = $STRING_ARRAY(list_arr.values());
-
-                            for v in string_arr.iter() {
-                                if let Some(v) = v {
-                                    builder.values().append_value(v);
-                                } else {
-                                    builder.values().append_null();
-                                }
-                            }
-                            builder.append(true);
-                        }
-                        sv => {
-                            return _internal_err!(
-                                "Inconsistent types in 
ScalarValue::iter_to_array. \
-                                    Expected List, got {:?}",
-                                sv
-                            )
-                        }
-                    }
+        fn build_list_array(
+            scalars: impl IntoIterator<Item = ScalarValue>,
+        ) -> Result<ArrayRef> {
+            let arrays = scalars

Review Comment:
   I see what you are saying -- sorry I was confused. 
   



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