diff --git a/spark-extension-shims-spark/src/test/scala/org/apache/auron/AuronFunctionSuite.scala b/spark-extension-shims-spark/src/test/scala/org/apache/auron/AuronFunctionSuite.scala
index ef07ce3a3..1688ff617 100644
--- a/spark-extension-shims-spark/src/test/scala/org/apache/auron/AuronFunctionSuite.scala
+++ b/spark-extension-shims-spark/src/test/scala/org/apache/auron/AuronFunctionSuite.scala
@@ -685,4 +685,62 @@ class AuronFunctionSuite extends AuronQueryTest with BaseAuronSQLSuite {
       }
     }
   }
+
+  test("ascii function") {
+    withTable("t1") {
+      sql("create table t1(c1 string) using parquet")
+      sql("insert into t1 values('A'), ('abc'), (''), (null)")
+      checkSparkAnswerAndOperator("select ascii(c1) from t1")
+    }
+  }
+
+  test("bit_length function") {
+    withTable("t1") {
+      sql("create table t1(c1 string) using parquet")
+      sql("insert into t1 values('hello'), (''), (null), ('caf\\u00e9')")
+      checkSparkAnswerAndOperator("select bit_length(c1) from t1")
+    }
+  }
+
+  test("chr function") {
+    withTable("t1") {
+      sql("create table t1(c1 bigint) using parquet")
+      sql("insert into t1 values(65), (97), (48), (null)")
+      checkSparkAnswerAndOperator("select chr(c1) from t1")
+    }
+  }
+
+  test("translate function") {
+    withTable("t1") {
+      sql("create table t1(c1 string) using parquet")
+      sql("insert into t1 values('AaBbCc'), ('hello'), (''), (null)")
+      checkSparkAnswerAndOperator("select translate(c1, 'ABC', 'xyz') from t1")
+    }
+  }
+
+  test("replace function") {
+    withTable("t1") {
+      sql("create table t1(c1 string) using parquet")
+      sql("insert into t1 values('hello world'), ('aaa'), (''), (null)")
+      checkSparkAnswerAndOperator("select replace(c1, 'world', 'spark') from t1")
+      checkSparkAnswerAndOperator("select replace(c1, 'a', '') from t1")
+    }
+  }
+
+  test("date_trunc function") {
+    withSQLConf(SQLConf.SESSION_LOCAL_TIMEZONE.key -> "UTC") {
+      withTable("t1") {
+        sql("create table t1(c1 timestamp) using parquet")
+        sql("""insert into t1 values
+            |  (timestamp'2024-03-15 14:30:45'),
+            |  (timestamp'2024-12-31 23:59:59'),
+            |  (null)
+            |""".stripMargin)
+        checkSparkAnswerAndOperator("select date_trunc('year', c1) from t1")
+        checkSparkAnswerAndOperator("select date_trunc('month', c1) from t1")
+        checkSparkAnswerAndOperator("select date_trunc('day', c1) from t1")
+        checkSparkAnswerAndOperator("select date_trunc('hour', c1) from t1")
+      }
+    }
+  }
 }
diff --git a/spark-extension/src/main/scala/org/apache/spark/sql/auron/NativeConverters.scala b/spark-extension/src/main/scala/org/apache/spark/sql/auron/NativeConverters.scala
index 68007c837..dbe31519e 100644
--- a/spark-extension/src/main/scala/org/apache/spark/sql/auron/NativeConverters.scala
+++ b/spark-extension/src/main/scala/org/apache/spark/sql/auron/NativeConverters.scala
@@ -891,6 +891,17 @@ object NativeConverters extends Logging {
         buildScalarFunction(pb.ScalarFunction.FindInSet, e.children, e.dataType)
       case e: Abs if e.dataType.isInstanceOf[FloatType] || e.dataType.isInstanceOf[DoubleType] =>
         buildScalarFunction(pb.ScalarFunction.Abs, e.children, e.dataType)
+      case e: Ascii => buildScalarFunction(pb.ScalarFunction.Ascii, e.children, e.dataType)
+      case e: BitLength =>
+        buildScalarFunction(pb.ScalarFunction.BitLength, e.children, e.dataType)
+      case e: Chr => buildScalarFunction(pb.ScalarFunction.Chr, e.children, e.dataType)
+      case e: StringTranslate =>
+        buildScalarFunction(pb.ScalarFunction.Translate, e.children, e.dataType)
+      case e: StringReplace =>
+        buildScalarFunction(pb.ScalarFunction.Replace, e.children, e.dataType)
+      case e: TruncTimestamp =>
+        buildScalarFunction(pb.ScalarFunction.DateTrunc, e.children, e.dataType)
+
       case e: OctetLength =>
         buildScalarFunction(pb.ScalarFunction.OctetLength, e.children, e.dataType)
       case Length(arg) if arg.dataType == StringType =>