diff --git a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Mul.java b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Mul.java
index 3eb78ef953f8f..e439c3982091c 100644
--- a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Mul.java
+++ b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Mul.java
@@ -34,6 +34,7 @@ public Mul(Source source, Expression left, Expression right) {
         );
     }
 
+    /*
     @Override
     protected TypeResolution resolveType() {
         if (childrenResolved() == false) {
@@ -51,6 +52,8 @@ protected TypeResolution resolveType() {
         return new TypeResolution(format(null, "[{}] has arguments with incompatible types [{}] and [{}]", symbol(), l, r));
     }
 
+     */
+
     @Override
     public ArithmeticOperationFactory binaryComparisonInverse() {
         return Div::new;
diff --git a/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/VerifierTests.java b/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/VerifierTests.java
index 2596340e7f206..8c583e0164d47 100644
--- a/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/VerifierTests.java
+++ b/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/VerifierTests.java
@@ -28,11 +28,11 @@ public class VerifierTests extends ESTestCase {
 
     public void testIncompatibleTypesInMathOperation() {
         assertEquals(
-            "1:40: second argument of [a + c] must be [numeric], found value [c] type [keyword]",
+            "1:40: second argument of [a + c] must be [datetime or numeric], found value [c] type [keyword]",
             error("row a = 1, b = 2, c = \"xxx\" | eval y = a + c")
         );
         assertEquals(
-            "1:40: second argument of [a - c] must be [numeric], found value [c] type [keyword]",
+            "1:40: second argument of [a - c] must be [datetime or numeric], found value [c] type [keyword]",
             error("row a = 1, b = 2, c = \"xxx\" | eval y = a - c")
         );
     }
@@ -214,14 +214,13 @@ public void testUnsignedLongTypeMixInArithmetics() {
                 assertThat(
                     error("row n = to_" + type + "(1), ul = to_ul(1) | eval " + op),
                     containsString(
-                        "first argument of ["
-                            + op
-                            + "] is ["
-                            + leftType
-                            + "] and second is ["
-                            + rightType
-                            + "]."
-                            + " [unsigned_long] can only be operated on together with another [unsigned_long]"
+                        "["
+                            + operation
+                            + "] has arguments with incompatible types ["
+                            + leftType.toUpperCase()
+                            + "] and ["
+                            + rightType.toUpperCase()
+                            + "]"
                     )
                 );
             }
@@ -230,7 +229,7 @@ public void testUnsignedLongTypeMixInArithmetics() {
 
     public void testUnsignedLongNegation() {
         assertEquals(
-            "1:29: negation unsupported for arguments of type [unsigned_long] in expression [-x]",
+            "1:29: argument of [-x] must be [numeric, date_period or time_duration], found value [x] type [unsigned_long]",
             error("row x = to_ul(1) | eval y = -x")
         );
     }
diff --git a/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/MulTests.java b/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/MulTests.java
index 2ab72ebf9d5f6..68c7794ec12a0 100644
--- a/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/MulTests.java
+++ b/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/MulTests.java
@@ -10,6 +10,7 @@
 import com.carrotsearch.randomizedtesting.annotations.Name;
 import com.carrotsearch.randomizedtesting.annotations.ParametersFactory;
 
+import org.elasticsearch.xpack.esql.expression.function.AbstractFunctionTestCase;
 import org.elasticsearch.xpack.esql.expression.function.TestCaseSupplier;
 import org.elasticsearch.xpack.ql.expression.Expression;
 import org.elasticsearch.xpack.ql.tree.Source;
@@ -23,7 +24,7 @@
 import static org.elasticsearch.xpack.ql.util.NumericUtils.unsignedLongAsBigInteger;
 import static org.hamcrest.Matchers.equalTo;
 
-public class MulTests extends AbstractArithmeticTestCase {
+public class MulTests extends AbstractFunctionTestCase {
     public MulTests(@Name("TestCase") Supplier<TestCaseSupplier.TestCase> testCaseSupplier) {
         this.testCase = testCaseSupplier.get();
     }
@@ -86,29 +87,7 @@ public static Iterable<Object[]> parameters() {
     }
 
     @Override
-    protected Mul build(Source source, Expression lhs, Expression rhs) {
-        return new Mul(source, lhs, rhs);
-    }
-
-    @Override
-    protected double expectedValue(double lhs, double rhs) {
-        return lhs * rhs;
-    }
-
-    @Override
-    protected int expectedValue(int lhs, int rhs) {
-        return lhs * rhs;
-    }
-
-    @Override
-    protected long expectedValue(long lhs, long rhs) {
-        return lhs * rhs;
-    }
-
-    @Override
-    protected long expectedUnsignedLongValue(long lhs, long rhs) {
-        BigInteger lhsBI = unsignedLongAsBigInteger(lhs);
-        BigInteger rhsBI = unsignedLongAsBigInteger(rhs);
-        return asLongUnsigned(lhsBI.multiply(rhsBI).longValue());
+    protected Expression build(Source source, List<Expression> args) {
+        return new Mul(source, args.get(0), args.get(1));
     }
 }