diff --git a/native/spark-expr/src/lib.rs b/native/spark-expr/src/lib.rs
index 5bffb9ee1c..c7c54a4e9f 100644
--- a/native/spark-expr/src/lib.rs
+++ b/native/spark-expr/src/lib.rs
@@ -27,8 +27,7 @@ mod bitwise_not;
 pub use bitwise_not::{bitwise_not, BitwiseNotExpr};
 mod checkoverflow;
 pub use checkoverflow::CheckOverflow;
-mod strings;
-pub use strings::{Contains, EndsWith, Like, StartsWith, StringSpaceExpr, SubstringExpr};
+
 mod kernels;
 mod list;
 mod regexp;
@@ -54,6 +53,8 @@ pub use normalize_nan::NormalizeNaNAndZero;
 
 mod agg_funcs;
 mod comet_scalar_funcs;
+mod string_funcs;
+
 mod datetime_funcs;
 pub use agg_funcs::*;
 
@@ -66,6 +67,7 @@ pub use error::{SparkError, SparkResult};
 pub use if_expr::IfExpr;
 pub use list::{ArrayInsert, GetArrayStructFields, ListExtract};
 pub use regexp::RLike;
+pub use string_funcs::*;
 pub use struct_funcs::*;
 pub use to_json::ToJson;
 
diff --git a/native/spark-expr/src/string_funcs/mod.rs b/native/spark-expr/src/string_funcs/mod.rs
new file mode 100644
index 0000000000..2c2a5b37c7
--- /dev/null
+++ b/native/spark-expr/src/string_funcs/mod.rs
@@ -0,0 +1,24 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+mod prediction;
+mod string_space;
+mod substring;
+
+pub use prediction::*;
+pub use string_space::StringSpaceExpr;
+pub use substring::SubstringExpr;
diff --git a/native/spark-expr/src/strings.rs b/native/spark-expr/src/string_funcs/prediction.rs
similarity index 54%
rename from native/spark-expr/src/strings.rs
rename to native/spark-expr/src/string_funcs/prediction.rs
index c2706b5896..d2ef82fcbe 100644
--- a/native/spark-expr/src/strings.rs
+++ b/native/spark-expr/src/string_funcs/prediction.rs
@@ -17,7 +17,6 @@
 
 #![allow(deprecated)]
 
-use crate::kernels::strings::{string_space, substring};
 use arrow::{
     compute::{
         contains_dyn, contains_utf8_scalar_dyn, ends_with_dyn, ends_with_utf8_scalar_dyn, like_dyn,
@@ -136,155 +135,3 @@ make_predicate_function!(StartsWith, starts_with_dyn, starts_with_utf8_scalar_dy
 make_predicate_function!(EndsWith, ends_with_dyn, ends_with_utf8_scalar_dyn);
 
 make_predicate_function!(Contains, contains_dyn, contains_utf8_scalar_dyn);
-
-#[derive(Debug, Eq)]
-pub struct SubstringExpr {
-    pub child: Arc<dyn PhysicalExpr>,
-    pub start: i64,
-    pub len: u64,
-}
-
-impl Hash for SubstringExpr {
-    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
-        self.child.hash(state);
-        self.start.hash(state);
-        self.len.hash(state);
-    }
-}
-
-impl PartialEq for SubstringExpr {
-    fn eq(&self, other: &Self) -> bool {
-        self.child.eq(&other.child) && self.start.eq(&other.start) && self.len.eq(&other.len)
-    }
-}
-#[derive(Debug, Eq)]
-pub struct StringSpaceExpr {
-    pub child: Arc<dyn PhysicalExpr>,
-}
-
-impl Hash for StringSpaceExpr {
-    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
-        self.child.hash(state);
-    }
-}
-
-impl PartialEq for StringSpaceExpr {
-    fn eq(&self, other: &Self) -> bool {
-        self.child.eq(&other.child)
-    }
-}
-
-impl SubstringExpr {
-    pub fn new(child: Arc<dyn PhysicalExpr>, start: i64, len: u64) -> Self {
-        Self { child, start, len }
-    }
-}
-
-impl StringSpaceExpr {
-    pub fn new(child: Arc<dyn PhysicalExpr>) -> Self {
-        Self { child }
-    }
-}
-
-impl Display for SubstringExpr {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        write!(
-            f,
-            "StringSpace [start: {}, len: {}, child: {}]",
-            self.start, self.len, self.child
-        )
-    }
-}
-
-impl Display for StringSpaceExpr {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        write!(f, "StringSpace [child: {}] ", self.child)
-    }
-}
-
-impl PhysicalExpr for SubstringExpr {
-    fn as_any(&self) -> &dyn Any {
-        self
-    }
-
-    fn data_type(&self, input_schema: &Schema) -> datafusion_common::Result<DataType> {
-        self.child.data_type(input_schema)
-    }
-
-    fn nullable(&self, _: &Schema) -> datafusion_common::Result<bool> {
-        Ok(true)
-    }
-
-    fn evaluate(&self, batch: &RecordBatch) -> datafusion_common::Result<ColumnarValue> {
-        let arg = self.child.evaluate(batch)?;
-        match arg {
-            ColumnarValue::Array(array) => {
-                let result = substring(&array, self.start, self.len)?;
-
-                Ok(ColumnarValue::Array(result))
-            }
-            _ => Err(DataFusionError::Execution(
-                "Substring(scalar) should be fold in Spark JVM side.".to_string(),
-            )),
-        }
-    }
-
-    fn children(&self) -> Vec<&Arc<dyn PhysicalExpr>> {
-        vec![&self.child]
-    }
-
-    fn with_new_children(
-        self: Arc<Self>,
-        children: Vec<Arc<dyn PhysicalExpr>>,
-    ) -> datafusion_common::Result<Arc<dyn PhysicalExpr>> {
-        Ok(Arc::new(SubstringExpr::new(
-            Arc::clone(&children[0]),
-            self.start,
-            self.len,
-        )))
-    }
-}
-
-impl PhysicalExpr for StringSpaceExpr {
-    fn as_any(&self) -> &dyn Any {
-        self
-    }
-
-    fn data_type(&self, input_schema: &Schema) -> datafusion_common::Result<DataType> {
-        match self.child.data_type(input_schema)? {
-            DataType::Dictionary(key_type, _) => {
-                Ok(DataType::Dictionary(key_type, Box::new(DataType::Utf8)))
-            }
-            _ => Ok(DataType::Utf8),
-        }
-    }
-
-    fn nullable(&self, _: &Schema) -> datafusion_common::Result<bool> {
-        Ok(true)
-    }
-
-    fn evaluate(&self, batch: &RecordBatch) -> datafusion_common::Result<ColumnarValue> {
-        let arg = self.child.evaluate(batch)?;
-        match arg {
-            ColumnarValue::Array(array) => {
-                let result = string_space(&array)?;
-
-                Ok(ColumnarValue::Array(result))
-            }
-            _ => Err(DataFusionError::Execution(
-                "StringSpace(scalar) should be fold in Spark JVM side.".to_string(),
-            )),
-        }
-    }
-
-    fn children(&self) -> Vec<&Arc<dyn PhysicalExpr>> {
-        vec![&self.child]
-    }
-
-    fn with_new_children(
-        self: Arc<Self>,
-        children: Vec<Arc<dyn PhysicalExpr>>,
-    ) -> datafusion_common::Result<Arc<dyn PhysicalExpr>> {
-        Ok(Arc::new(StringSpaceExpr::new(Arc::clone(&children[0]))))
-    }
-}
diff --git a/native/spark-expr/src/string_funcs/string_space.rs b/native/spark-expr/src/string_funcs/string_space.rs
new file mode 100644
index 0000000000..db70929057
--- /dev/null
+++ b/native/spark-expr/src/string_funcs/string_space.rs
@@ -0,0 +1,104 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#![allow(deprecated)]
+
+use crate::kernels::strings::string_space;
+use arrow::record_batch::RecordBatch;
+use arrow_schema::{DataType, Schema};
+use datafusion::logical_expr::ColumnarValue;
+use datafusion_common::DataFusionError;
+use datafusion_physical_expr::PhysicalExpr;
+use std::{
+    any::Any,
+    fmt::{Display, Formatter},
+    hash::Hash,
+    sync::Arc,
+};
+
+#[derive(Debug, Eq)]
+pub struct StringSpaceExpr {
+    pub child: Arc<dyn PhysicalExpr>,
+}
+
+impl Hash for StringSpaceExpr {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.child.hash(state);
+    }
+}
+
+impl PartialEq for StringSpaceExpr {
+    fn eq(&self, other: &Self) -> bool {
+        self.child.eq(&other.child)
+    }
+}
+
+impl StringSpaceExpr {
+    pub fn new(child: Arc<dyn PhysicalExpr>) -> Self {
+        Self { child }
+    }
+}
+
+impl Display for StringSpaceExpr {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "StringSpace [child: {}] ", self.child)
+    }
+}
+
+impl PhysicalExpr for StringSpaceExpr {
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+
+    fn data_type(&self, input_schema: &Schema) -> datafusion_common::Result<DataType> {
+        match self.child.data_type(input_schema)? {
+            DataType::Dictionary(key_type, _) => {
+                Ok(DataType::Dictionary(key_type, Box::new(DataType::Utf8)))
+            }
+            _ => Ok(DataType::Utf8),
+        }
+    }
+
+    fn nullable(&self, _: &Schema) -> datafusion_common::Result<bool> {
+        Ok(true)
+    }
+
+    fn evaluate(&self, batch: &RecordBatch) -> datafusion_common::Result<ColumnarValue> {
+        let arg = self.child.evaluate(batch)?;
+        match arg {
+            ColumnarValue::Array(array) => {
+                let result = string_space(&array)?;
+
+                Ok(ColumnarValue::Array(result))
+            }
+            _ => Err(DataFusionError::Execution(
+                "StringSpace(scalar) should be fold in Spark JVM side.".to_string(),
+            )),
+        }
+    }
+
+    fn children(&self) -> Vec<&Arc<dyn PhysicalExpr>> {
+        vec![&self.child]
+    }
+
+    fn with_new_children(
+        self: Arc<Self>,
+        children: Vec<Arc<dyn PhysicalExpr>>,
+    ) -> datafusion_common::Result<Arc<dyn PhysicalExpr>> {
+        Ok(Arc::new(StringSpaceExpr::new(Arc::clone(&children[0]))))
+    }
+}
diff --git a/native/spark-expr/src/string_funcs/substring.rs b/native/spark-expr/src/string_funcs/substring.rs
new file mode 100644
index 0000000000..741ea9139d
--- /dev/null
+++ b/native/spark-expr/src/string_funcs/substring.rs
@@ -0,0 +1,111 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#![allow(deprecated)]
+
+use crate::kernels::strings::substring;
+use arrow::record_batch::RecordBatch;
+use arrow_schema::{DataType, Schema};
+use datafusion::logical_expr::ColumnarValue;
+use datafusion_common::DataFusionError;
+use datafusion_physical_expr::PhysicalExpr;
+use std::{
+    any::Any,
+    fmt::{Display, Formatter},
+    hash::Hash,
+    sync::Arc,
+};
+
+#[derive(Debug, Eq)]
+pub struct SubstringExpr {
+    pub child: Arc<dyn PhysicalExpr>,
+    pub start: i64,
+    pub len: u64,
+}
+
+impl Hash for SubstringExpr {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.child.hash(state);
+        self.start.hash(state);
+        self.len.hash(state);
+    }
+}
+
+impl PartialEq for SubstringExpr {
+    fn eq(&self, other: &Self) -> bool {
+        self.child.eq(&other.child) && self.start.eq(&other.start) && self.len.eq(&other.len)
+    }
+}
+
+impl SubstringExpr {
+    pub fn new(child: Arc<dyn PhysicalExpr>, start: i64, len: u64) -> Self {
+        Self { child, start, len }
+    }
+}
+
+impl Display for SubstringExpr {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "StringSpace [start: {}, len: {}, child: {}]",
+            self.start, self.len, self.child
+        )
+    }
+}
+
+impl PhysicalExpr for SubstringExpr {
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+
+    fn data_type(&self, input_schema: &Schema) -> datafusion_common::Result<DataType> {
+        self.child.data_type(input_schema)
+    }
+
+    fn nullable(&self, _: &Schema) -> datafusion_common::Result<bool> {
+        Ok(true)
+    }
+
+    fn evaluate(&self, batch: &RecordBatch) -> datafusion_common::Result<ColumnarValue> {
+        let arg = self.child.evaluate(batch)?;
+        match arg {
+            ColumnarValue::Array(array) => {
+                let result = substring(&array, self.start, self.len)?;
+
+                Ok(ColumnarValue::Array(result))
+            }
+            _ => Err(DataFusionError::Execution(
+                "Substring(scalar) should be fold in Spark JVM side.".to_string(),
+            )),
+        }
+    }
+
+    fn children(&self) -> Vec<&Arc<dyn PhysicalExpr>> {
+        vec![&self.child]
+    }
+
+    fn with_new_children(
+        self: Arc<Self>,
+        children: Vec<Arc<dyn PhysicalExpr>>,
+    ) -> datafusion_common::Result<Arc<dyn PhysicalExpr>> {
+        Ok(Arc::new(SubstringExpr::new(
+            Arc::clone(&children[0]),
+            self.start,
+            self.len,
+        )))
+    }
+}