diff --git a/test/it/parser/src/main/resources/case/dml/select-math-function.xml b/test/it/parser/src/main/resources/case/dml/select-math-function.xml
index 38e572452f595..1da9312a13319 100644
--- a/test/it/parser/src/main/resources/case/dml/select-math-function.xml
+++ b/test/it/parser/src/main/resources/case/dml/select-math-function.xml
@@ -130,4 +130,35 @@
             </expression-projection>
         </projections>
     </select>
+
+    <select sql-case-id="select_least">
+        <projections start-index="7" stop-index="17">
+            <expression-projection start-index="7" stop-index="17" text="LEAST(2, 0)">
+                <expr>
+                    <function start-index="7" stop-index="17" function-name="LEAST" text="LEAST(2, 0)">
+                        <parameter>
+                            <literal-expression start-index="13" stop-index="13" value="2"/>
+                        </parameter>
+                        <parameter>
+                            <literal-expression start-index="16" stop-index="16" value="0"/>
+                        </parameter>
+                    </function>
+                </expr>
+            </expression-projection>
+        </projections>
+    </select>
+
+    <select sql-case-id="select_ln">
+        <projections start-index="7" stop-index="11">
+            <expression-projection start-index="7" stop-index="11" text="LN(2)">
+                <expr>
+                    <function start-index="7" stop-index="11" function-name="LN" text="LN(2)">
+                        <parameter>
+                            <literal-expression start-index="10" stop-index="10" value="2"/>
+                        </parameter>
+                    </function>
+                </expr>
+            </expression-projection>
+        </projections>
+    </select>
 </sql-parser-test-cases>
diff --git a/test/it/parser/src/main/resources/case/dml/select-special-function.xml b/test/it/parser/src/main/resources/case/dml/select-special-function.xml
index f04eef1ed2c63..aded88bd8410f 100644
--- a/test/it/parser/src/main/resources/case/dml/select-special-function.xml
+++ b/test/it/parser/src/main/resources/case/dml/select-special-function.xml
@@ -4247,4 +4247,59 @@
             </expression-projection>
         </projections>
     </select>
+    <select sql-case-id="select_lcase_function">
+        <projections start-index="7" stop-index="28">
+            <expression-projection start-index="7" stop-index="28" text="LCASE('QUADRATICALLY')">
+                <expr>
+                    <function start-index="7" stop-index="28" function-name="LCASE" text="LCASE('QUADRATICALLY')">
+                        <parameter>
+                            <literal-expression start-index="13" stop-index="27" value="QUADRATICALLY"/>
+                        </parameter>
+                    </function>
+                </expr>
+            </expression-projection>
+        </projections>
+    </select>
+    <select sql-case-id="select_lower_function">
+        <projections start-index="7" stop-index="28">
+            <expression-projection start-index="7" stop-index="28" text="LOWER('QUADRATICALLY')">
+                <expr>
+                    <function start-index="7" stop-index="28" function-name="LOWER" text="LOWER('QUADRATICALLY')">
+                        <parameter>
+                            <literal-expression start-index="13" stop-index="27" value="QUADRATICALLY"/>
+                        </parameter>
+                    </function>
+                </expr>
+            </expression-projection>
+        </projections>
+    </select>
+    <select sql-case-id="select_length">
+        <projections start-index="7" stop-index="20">
+            <expression-projection start-index="7" stop-index="20" text="LENGTH('TEXT')">
+                <expr>
+                    <function start-index="7" stop-index="20" function-name="LENGTH" text="LENGTH('TEXT')">
+                        <parameter>
+                            <literal-expression start-index="14" stop-index="19" value="TEXT"/>
+                        </parameter>
+                    </function>
+                </expr>
+            </expression-projection>
+        </projections>
+    </select>
+    <select sql-case-id="select_locate">
+        <projections start-index="7" stop-index="31">
+            <expression-projection start-index="7" stop-index="31" text="LOCATE('bar','foobarbar')">
+                <expr>
+                    <function start-index="7" stop-index="31" function-name="LOCATE" text="LOCATE('bar','foobarbar')">
+                        <parameter>
+                            <literal-expression  value="bar" start-index="14" stop-index="18"/>
+                        </parameter>
+                        <parameter>
+                            <literal-expression  value="foobarbar" start-index="20" stop-index="30"/>
+                        </parameter>
+                    </function>
+                </expr>
+            </expression-projection>
+        </projections>
+    </select>
 </sql-parser-test-cases>
diff --git a/test/it/parser/src/main/resources/sql/supported/dml/select-math-function.xml b/test/it/parser/src/main/resources/sql/supported/dml/select-math-function.xml
index f4d79159f32fd..c3ad34b0f081d 100644
--- a/test/it/parser/src/main/resources/sql/supported/dml/select-math-function.xml
+++ b/test/it/parser/src/main/resources/sql/supported/dml/select-math-function.xml
@@ -25,4 +25,6 @@
     <sql-case id="select_power" value="SELECT POWER(2,2)" db-types="MySQL" />
     <sql-case id="select_rand" value="SELECT RAND()" db-types="MySQL" />
     <sql-case id="select_radians" value="SELECT RADIANS(90)" db-types="MySQL" />
+    <sql-case id="select_least" value="SELECT LEAST(2, 0)" db-types="MySQL" />
+    <sql-case id="select_ln" value="SELECT LN(2)" db-types="MySQL" />
 </sql-cases>
diff --git a/test/it/parser/src/main/resources/sql/supported/dml/select-special-function.xml b/test/it/parser/src/main/resources/sql/supported/dml/select-special-function.xml
index 5bbc93a7a184c..fc4f02221a506 100644
--- a/test/it/parser/src/main/resources/sql/supported/dml/select-special-function.xml
+++ b/test/it/parser/src/main/resources/sql/supported/dml/select-special-function.xml
@@ -246,4 +246,8 @@
     <sql-case id="select_st_crosses" value="SELECT ST_Crosses(ST_GeomFromText('POINT(1 1)'), ST_GeomFromText('POINT(2 2)'))" db-types="MySQL,Doris" />
     <sql-case id="select_bitxor" value="SELECT BITXOR(3,5)" db-types="Doris" />
     <sql-case id="select_instr" value="SELECT INSTR('foobar','bar')" db-types="Doris" />
+    <sql-case id="select_lcase_function" value="SELECT LCASE('QUADRATICALLY')" db-types="MySQL" />
+    <sql-case id="select_lower_function" value="SELECT LOWER('QUADRATICALLY')" db-types="MySQL" />
+    <sql-case id="select_length" value="SELECT LENGTH('TEXT')" db-types="MySQL" />
+    <sql-case id="select_locate" value="SELECT LOCATE('bar','foobarbar')" db-types="MySQL" />
 </sql-cases>