diff --git a/datafusion/common/src/scalar.rs b/datafusion/common/src/scalar.rs
index b837341c392e..b30238762a36 100644
--- a/datafusion/common/src/scalar.rs
+++ b/datafusion/common/src/scalar.rs
@@ -917,6 +917,11 @@ impl ScalarValue {
                     ScalarValue::iter_to_decimal_array(scalars, precision, scale)?;
                 Arc::new(decimal_array)
             }
+            DataType::Decimal256(_, _) => {
+                return Err(DataFusionError::Internal(
+                    "Decimal256 is not supported for ScalarValue".to_string(),
+                ))
+            }
             DataType::Null => ScalarValue::iter_to_null_array(scalars),
             DataType::Boolean => build_array_primitive!(BooleanArray, Boolean),
             DataType::Float32 => build_array_primitive!(Float32Array, Float32),
diff --git a/datafusion/core/src/physical_optimizer/pruning.rs b/datafusion/core/src/physical_optimizer/pruning.rs
index 2265675b300b..b1242b15032f 100644
--- a/datafusion/core/src/physical_optimizer/pruning.rs
+++ b/datafusion/core/src/physical_optimizer/pruning.rs
@@ -800,7 +800,7 @@ mod tests {
     use crate::from_slice::FromSlice;
     use crate::logical_plan::{col, lit};
     use crate::{assert_batches_eq, physical_optimizer::pruning::StatisticsType};
-    use arrow::array::DecimalArray;
+    use arrow::array::Decimal128Array;
     use arrow::{
         array::{BinaryArray, Int32Array, Int64Array, StringArray},
         datatypes::{DataType, TimeUnit},
@@ -825,13 +825,13 @@ mod tests {
             Self {
                 min: Arc::new(
                     min.into_iter()
-                        .collect::<DecimalArray>()
+                        .collect::<Decimal128Array>()
                         .with_precision_and_scale(precision, scale)
                         .unwrap(),
                 ),
                 max: Arc::new(
                     max.into_iter()
-                        .collect::<DecimalArray>()
+                        .collect::<Decimal128Array>()
                         .with_precision_and_scale(precision, scale)
                         .unwrap(),
                 ),
diff --git a/datafusion/core/tests/sql/mod.rs b/datafusion/core/tests/sql/mod.rs
index 2a45b342f7b5..7f235b1ba622 100644
--- a/datafusion/core/tests/sql/mod.rs
+++ b/datafusion/core/tests/sql/mod.rs
@@ -571,25 +571,25 @@ async fn register_tpch_csv_data(
             match field.data_type() {
                 DataType::Utf8 => {
                     let sb = col.as_any_mut().downcast_mut::<StringBuilder>().unwrap();
-                    sb.append_value(val)?;
+                    sb.append_value(val);
                 }
                 DataType::Date32 => {
                     let sb = col.as_any_mut().downcast_mut::<Date32Builder>().unwrap();
                     let dt = NaiveDate::parse_from_str(val.trim(), "%Y-%m-%d").unwrap();
                     let dt = dt.sub(NaiveDate::from_ymd(1970, 1, 1)).num_days() as i32;
-                    sb.append_value(dt)?;
+                    sb.append_value(dt);
                 }
                 DataType::Int32 => {
                     let sb = col.as_any_mut().downcast_mut::<Int32Builder>().unwrap();
-                    sb.append_value(val.trim().parse().unwrap())?;
+                    sb.append_value(val.trim().parse().unwrap());
                 }
                 DataType::Int64 => {
                     let sb = col.as_any_mut().downcast_mut::<Int64Builder>().unwrap();
-                    sb.append_value(val.trim().parse().unwrap())?;
+                    sb.append_value(val.trim().parse().unwrap());
                 }
                 DataType::Float64 => {
                     let sb = col.as_any_mut().downcast_mut::<Float64Builder>().unwrap();
-                    sb.append_value(val.trim().parse().unwrap())?;
+                    sb.append_value(val.trim().parse().unwrap());
                 }
                 _ => Err(DataFusionError::Plan(format!(
                     "Not implemented: {}",
diff --git a/datafusion/proto/src/to_proto.rs b/datafusion/proto/src/to_proto.rs
index fd5276ca8bc9..60f4079da2ba 100644
--- a/datafusion/proto/src/to_proto.rs
+++ b/datafusion/proto/src/to_proto.rs
@@ -223,6 +223,9 @@ impl From<&DataType> for protobuf::arrow_type::ArrowTypeEnum {
                 whole: *whole as u64,
                 fractional: *fractional as u64,
             }),
+            DataType::Decimal256(_, _) => {
+                unimplemented!("The Decimal256 data type is not yet supported")
+            }
             DataType::Map(_, _) => {
                 unimplemented!("The Map data type is not yet supported")
             }
@@ -1237,7 +1240,8 @@ impl TryFrom<&DataType> for protobuf::scalar_type::Datatype {
             | DataType::Union(_, _, _)
             | DataType::Dictionary(_, _)
             | DataType::Map(_, _)
-            | DataType::Decimal(_, _) => {
+            | DataType::Decimal(_, _)
+            | DataType::Decimal256(_, _) => {
                 return Err(Error::invalid_scalar_type(val));
             }
         };