diff --git a/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/schema/function/BuildInSqlFunctionTable.java b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/schema/function/BuildInSqlFunctionTable.java
index 47addc84a..9ef8fd9c3 100644
--- a/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/schema/function/BuildInSqlFunctionTable.java
+++ b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/schema/function/BuildInSqlFunctionTable.java
@@ -109,9 +109,11 @@
 import org.apache.geaflow.dsl.udf.table.string.Instr;
 import org.apache.geaflow.dsl.udf.table.string.IsBlank;
 import org.apache.geaflow.dsl.udf.table.string.KeyValue;
+import org.apache.geaflow.dsl.udf.table.string.LPad;
 import org.apache.geaflow.dsl.udf.table.string.LTrim;
 import org.apache.geaflow.dsl.udf.table.string.Length;
 import org.apache.geaflow.dsl.udf.table.string.Like;
+import org.apache.geaflow.dsl.udf.table.string.RPad;
 import org.apache.geaflow.dsl.udf.table.string.RTrim;
 import org.apache.geaflow.dsl.udf.table.string.RegExp;
 import org.apache.geaflow.dsl.udf.table.string.RegExpExtract;
@@ -123,6 +125,7 @@
 import org.apache.geaflow.dsl.udf.table.string.Space;
 import org.apache.geaflow.dsl.udf.table.string.SplitEx;
 import org.apache.geaflow.dsl.udf.table.string.Substr;
+import org.apache.geaflow.dsl.udf.table.string.Trim;
 import org.apache.geaflow.dsl.udf.table.string.UrlDecode;
 import org.apache.geaflow.dsl.udf.table.string.UrlEncode;
 import org.apache.geaflow.dsl.util.FunctionUtil;
@@ -186,6 +189,7 @@ public class BuildInSqlFunctionTable extends ListSqlOperatorTable {
             .add(GeaFlowFunction.of(KeyValue.class))
             .add(GeaFlowFunction.of(Length.class))
             .add(GeaFlowFunction.of(Like.class))
+            .add(GeaFlowFunction.of(LPad.class))
             .add(GeaFlowFunction.of(LTrim.class))
             .add(GeaFlowFunction.of(RegExp.class))
             .add(GeaFlowFunction.of(RegexpCount.class))
@@ -194,10 +198,12 @@ public class BuildInSqlFunctionTable extends ListSqlOperatorTable {
             .add(GeaFlowFunction.of(Repeat.class))
             .add(GeaFlowFunction.of(Replace.class))
             .add(GeaFlowFunction.of(Reverse.class))
+            .add(GeaFlowFunction.of(RPad.class))
             .add(GeaFlowFunction.of(RTrim.class))
             .add(GeaFlowFunction.of(Space.class))
             .add(GeaFlowFunction.of(SplitEx.class))
             .add(GeaFlowFunction.of(Substr.class))
+            .add(GeaFlowFunction.of(Trim.class))
             .add(GeaFlowFunction.of(UrlDecode.class))
             .add(GeaFlowFunction.of(UrlEncode.class))
             .add(GeaFlowFunction.of(GetJsonObject.class))
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/LPad.java b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/LPad.java
new file mode 100644
index 000000000..53afc6641
--- /dev/null
+++ b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/LPad.java
@@ -0,0 +1,51 @@
+/*
+ * 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.
+ */
+
+package org.apache.geaflow.dsl.udf.table.string;
+
+import org.apache.geaflow.dsl.common.function.Description;
+import org.apache.geaflow.dsl.common.function.UDF;
+
+@Description(name = "lpad", description = "Returns the string left-padded to the given length "
+    + "with the specified pad string.")
+public class LPad extends UDF {
+
+    public String eval(String str, Integer len, String pad) {
+        if (str == null || len == null || pad == null) {
+            return null;
+        }
+        if (len <= 0) {
+            return "";
+        }
+        if (len <= str.length()) {
+            return str.substring(0, len);
+        }
+        if (pad.isEmpty()) {
+            return str;
+        }
+        StringBuilder sb = new StringBuilder();
+        int padLen = len - str.length();
+        while (sb.length() < padLen) {
+            sb.append(pad);
+        }
+        sb.setLength(padLen);
+        sb.append(str);
+        return sb.toString();
+    }
+}
\ No newline at end of file
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/RPad.java b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/RPad.java
new file mode 100644
index 000000000..18476ae3f
--- /dev/null
+++ b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/RPad.java
@@ -0,0 +1,50 @@
+/*
+ * 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.
+ */
+
+package org.apache.geaflow.dsl.udf.table.string;
+
+import org.apache.geaflow.dsl.common.function.Description;
+import org.apache.geaflow.dsl.common.function.UDF;
+
+@Description(name = "rpad", description = "Returns the string right-padded to the given length "
+    + "with the specified pad string.")
+public class RPad extends UDF {
+
+    public String eval(String str, Integer len, String pad) {
+        if (str == null || len == null || pad == null) {
+            return null;
+        }
+        if (len <= 0) {
+            return "";
+        }
+        if (len <= str.length()) {
+            return str.substring(0, len);
+        }
+        if (pad.isEmpty()) {
+            return str;
+        }
+        StringBuilder sb = new StringBuilder();
+        sb.append(str);
+        while (sb.length() < len) {
+            sb.append(pad);
+        }
+        sb.setLength(len);
+        return sb.toString();
+    }
+}
\ No newline at end of file
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/Trim.java b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/Trim.java
new file mode 100644
index 000000000..ba37fa91e
--- /dev/null
+++ b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/Trim.java
@@ -0,0 +1,51 @@
+/*
+ * 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.
+ */
+
+package org.apache.geaflow.dsl.udf.table.string;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.geaflow.common.binary.BinaryString;
+import org.apache.geaflow.dsl.common.function.Description;
+import org.apache.geaflow.dsl.common.function.UDF;
+
+@Description(name = "trim", description = "Returns a string with both leading and trailing whitespace removed.")
+public class Trim extends UDF {
+
+    public String eval(String s) {
+        if (s == null) {
+            return null;
+        }
+        return StringUtils.strip(s);
+    }
+
+    public BinaryString eval(BinaryString s) {
+        if (s == null) {
+            return null;
+        }
+        int l = 0;
+        int r = s.getLength() - 1;
+        while (l <= r && s.getByte(l) == ' ') {
+            l++;
+        }
+        while (r >= l && s.getByte(r) == ' ') {
+            r--;
+        }
+        return s.substring(l, r + 1);
+    }
+}
\ No newline at end of file
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/java/org/apache/geaflow/dsl/runtime/query/StringFunctionTest.java b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/java/org/apache/geaflow/dsl/runtime/query/StringFunctionTest.java
new file mode 100644
index 000000000..4843b145a
--- /dev/null
+++ b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/java/org/apache/geaflow/dsl/runtime/query/StringFunctionTest.java
@@ -0,0 +1,52 @@
+/*
+ * 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.
+ */
+
+package org.apache.geaflow.dsl.runtime.query;
+
+import org.testng.annotations.Test;
+
+public class StringFunctionTest {
+
+    @Test
+    public void testTrim() throws Exception {
+        QueryTester
+            .build()
+            .withQueryPath("/query/function_trim.sql")
+            .execute()
+            .checkSinkResult();
+    }
+
+    @Test
+    public void testLpad() throws Exception {
+        QueryTester
+            .build()
+            .withQueryPath("/query/function_lpad.sql")
+            .execute()
+            .checkSinkResult();
+    }
+
+    @Test
+    public void testRpad() throws Exception {
+        QueryTester
+            .build()
+            .withQueryPath("/query/function_rpad.sql")
+            .execute()
+            .checkSinkResult();
+    }
+}
\ No newline at end of file
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/expect/function_lpad.txt b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/expect/function_lpad.txt
new file mode 100644
index 000000000..af9947bab
--- /dev/null
+++ b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/expect/function_lpad.txt
@@ -0,0 +1 @@
+xxxhi,hello,hel,ababahi
\ No newline at end of file
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/expect/function_rpad.txt b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/expect/function_rpad.txt
new file mode 100644
index 000000000..d5d5389c0
--- /dev/null
+++ b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/expect/function_rpad.txt
@@ -0,0 +1 @@
+hixxx,hello,hel,hiababa
\ No newline at end of file
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/expect/function_trim.txt b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/expect/function_trim.txt
new file mode 100644
index 000000000..77a3dd2b3
--- /dev/null
+++ b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/expect/function_trim.txt
@@ -0,0 +1 @@
+hello,world,a b c
\ No newline at end of file
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/query/function_lpad.sql b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/query/function_lpad.sql
new file mode 100644
index 000000000..209864d9f
--- /dev/null
+++ b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/query/function_lpad.sql
@@ -0,0 +1,35 @@
+/*
+ * 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.
+ */
+
+CREATE TABLE output_console(
+    c1 varchar,
+    c2 varchar,
+    c3 varchar,
+    c4 varchar
+) WITH (
+    type='file',
+    geaflow.dsl.file.path='${target}'
+);
+
+INSERT INTO output_console
+SELECT
+    lpad('hi', 5, 'x'),
+    lpad('hello', 5, 'x'),
+    lpad('hello', 3, 'x'),
+    lpad('hi', 7, 'ab')
\ No newline at end of file
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/query/function_rpad.sql b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/query/function_rpad.sql
new file mode 100644
index 000000000..25e43f069
--- /dev/null
+++ b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/query/function_rpad.sql
@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+CREATE TABLE output_console(
+    c1 varchar,
+    c2 varchar,
+    c3 varchar,
+    c4 varchar
+) WITH (
+    type='file',
+    geaflow.dsl.file.path='${target}'
+);
+
+INSERT INTO output_console
+SELECT
+    rpad('hi', 5, 'x'),
+    rpad('hello', 5, 'x'),
+    rpad('hello', 3, 'x'),
+    rpad('hi', 7, 'ab')
\ No newline at end of file
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/query/function_trim.sql b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/query/function_trim.sql
new file mode 100644
index 000000000..74020d299
--- /dev/null
+++ b/geaflow/geaflow-dsl/geaflow-dsl-runtime/src/test/resources/query/function_trim.sql
@@ -0,0 +1,33 @@
+/*
+ * 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.
+ */
+
+CREATE TABLE output_console(
+    c1 varchar,
+    c2 varchar,
+    c3 varchar
+) WITH (
+    type='file',
+    geaflow.dsl.file.path='${target}'
+);
+
+INSERT INTO output_console
+SELECT
+    trim('  hello  '),
+    trim('world'),
+    trim('  a b c  ')
\ No newline at end of file