diff --git a/databend-jdbc/src/main/java/com/databend/jdbc/DatabendConnection.java b/databend-jdbc/src/main/java/com/databend/jdbc/DatabendConnection.java
index 048d2db..4ed5076 100644
--- a/databend-jdbc/src/main/java/com/databend/jdbc/DatabendConnection.java
+++ b/databend-jdbc/src/main/java/com/databend/jdbc/DatabendConnection.java
@@ -149,7 +149,7 @@ public PreparedStatement prepareStatement(String s)
     @Override
     public CallableStatement prepareCall(String s)
             throws SQLException {
-        return null;
+        throw new SQLFeatureNotSupportedException("prepareCall");
     }
 
     @Override
@@ -349,7 +349,6 @@ public PreparedStatement prepareStatement(String sql, int resultSetType, int res
     @Override
     public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)
             throws SQLException {
-//        checkHoldability(resultSetHoldability);
         return prepareCall(sql, resultSetType, resultSetConcurrency);
     }