diff --git a/datafusion/expr/src/type_coercion/binary.rs b/datafusion/expr/src/type_coercion/binary.rs
index a54e88dd879f8..5f9dd94be42f3 100644
--- a/datafusion/expr/src/type_coercion/binary.rs
+++ b/datafusion/expr/src/type_coercion/binary.rs
@@ -301,7 +301,7 @@ pub fn comparison_coercion(lhs_type: &DataType, rhs_type: &DataType) -> Option<D
         .or_else(|| dictionary_coercion(lhs_type, rhs_type, true))
         .or_else(|| temporal_coercion(lhs_type, rhs_type))
         .or_else(|| string_coercion(lhs_type, rhs_type))
-        .or_else(|| allow_null_coercion(lhs_type, rhs_type))
+        .or_else(|| null_coercion(lhs_type, rhs_type))
         .or_else(|| string_numeric_coercion(lhs_type, rhs_type))
         .or_else(|| string_temporal_coercion(lhs_type, rhs_type))
         .or_else(|| binary_coercion(lhs_type, rhs_type))
@@ -844,7 +844,7 @@ fn temporal_coercion(lhs_type: &DataType, rhs_type: &DataType) -> Option<DataTyp
 
 /// coercion rules from NULL type. Since NULL can be casted to any other type in arrow,
 /// either lhs or rhs is NULL, if NULL can be casted to type of the other side, the coercion is valid.
-fn allow_null_coercion(lhs_type: &DataType, rhs_type: &DataType) -> Option<DataType> {
+fn null_coercion(lhs_type: &DataType, rhs_type: &DataType) -> Option<DataType> {
     match (lhs_type, rhs_type) {
         (DataType::Null, other_type) | (other_type, DataType::Null) => {
             if can_cast_types(&DataType::Null, other_type) {