diff --git a/src/sql/engine/expr/ob_expr_nullif.cpp b/src/sql/engine/expr/ob_expr_nullif.cpp
index 81c5af3708..ea31562182 100644
--- a/src/sql/engine/expr/ob_expr_nullif.cpp
+++ b/src/sql/engine/expr/ob_expr_nullif.cpp
@@ -79,23 +79,8 @@ int ObExprNullif::se_deduce_type(ObExprResType &type,
   if (ob_is_real_type(type.get_type()) && SCALE_UNKNOWN_YET != type1.get_scale()) {
     type.set_precision(static_cast<ObPrecision>(ObMySQLUtil::float_length(type1.get_scale())));
   } else if (ob_is_string_type(type.get_type()) || ob_is_enumset_tc(type.get_type())) {
-    ObCollationLevel res_cs_level = CS_LEVEL_INVALID;
-    ObCollationType res_cs_type = CS_TYPE_INVALID;
-    OZ(ObCharset::aggregate_collation(type1.get_collation_level(), type1.get_collation_type(),
-                                      type2.get_collation_level(), type2.get_collation_type(),
-                                      res_cs_level, res_cs_type));
-    if (OB_SUCC(ret)) {
-      type.set_collation_level(res_cs_level);
-      type.set_collation_type(res_cs_type);
-      //deduce length
-      if (type.get_collation_type() == CS_TYPE_BINARY) {
-        ObLength len_in_byte = -1;
-        OZ(type1.get_length_for_meta_in_bytes(len_in_byte));
-        OX(type.set_length(len_in_byte));
-      } else {
-        type.set_length(type1.get_length());
-      }
-    }
+    type.set_collation_level(type1.get_collation_level());
+    type.set_collation_type(type1.get_collation_type());
   }
   if (ob_is_enumset_tc(type.get_type()) || ob_is_enumset_inner_tc(type.get_type())) {
     type.set_varchar();
@@ -117,8 +102,6 @@ int ObExprNullif::se_deduce_type(ObExprResType &type,
             type1.set_calc_type(calc_type);
             type1.set_calc_collation_type(cmp_type.get_calc_collation_type());
           }
-          //if (ob_is_enumset_tc(type2.get_type())) {
-          //}
         }
         // set calc type for type2 no matter whether calc_type is varchar or not, and no matther which param is enum.
         type2.set_calc_type(calc_type);
@@ -128,14 +111,6 @@ int ObExprNullif::se_deduce_type(ObExprResType &type,
     if (OB_SUCC(ret)) {
       type.set_calc_meta(cmp_type.get_calc_meta());
       type.set_calc_accuracy(cmp_type.get_calc_accuracy());
-      if (ob_is_string_type(type1.get_type())
-          && ob_is_string_type(type2.get_type())
-          && ob_obj_type_class(type1.get_type()) != ob_obj_type_class(type2.get_type())
-          && ob_enable_lob_locator_v2()) {
-        // strings and texts cannot compare directly in 4.1
-        type1.set_calc_type(type.get_calc_meta().get_type());
-        type2.set_calc_type(type.get_calc_meta().get_type());
-      }
     }
   }
   return ret;
diff --git a/tools/deploy/mysql_test/test_suite/static_engine/r/mysql/expr_nullif_ifnull.result b/tools/deploy/mysql_test/test_suite/static_engine/r/mysql/expr_nullif_ifnull.result
index 4c5bbda54e..1efafba665 100644
--- a/tools/deploy/mysql_test/test_suite/static_engine/r/mysql/expr_nullif_ifnull.result
+++ b/tools/deploy/mysql_test/test_suite/static_engine/r/mysql/expr_nullif_ifnull.result
@@ -7475,7 +7475,7 @@ select collation(nullif('a', binary'b'));
 +-----------------------------------+
 | collation(nullif('a', binary'b')) |
 +-----------------------------------+
-| binary                            |
+| utf8mb4_general_ci                |
 +-----------------------------------+
 select NULLIF(14152561829011783680, 1);
 +---------------------------------+
@@ -7661,7 +7661,7 @@ select collation(nullif('a', binary 'b'));
 +------------------------------------+
 | collation(nullif('a', binary 'b')) |
 +------------------------------------+
-| binary                             |
+| utf8mb4_general_ci                 |
 +------------------------------------+
 
 ## test nullif with enumset parameter.