diff --git a/deps/oblib/src/common/ob_field.cpp b/deps/oblib/src/common/ob_field.cpp
index 3a0dfec8e..f4d5b2e6d 100644
--- a/deps/oblib/src/common/ob_field.cpp
+++ b/deps/oblib/src/common/ob_field.cpp
@@ -359,11 +359,7 @@ int ObField::get_field_mb_length(const ObObjType type,
         if (OB_FAIL(common::ObCharset::get_mbmaxlen_by_coll(charsetnr, mbmaxlen))) {
           LOG_WARN("fail to get mbmaxlen", K(charsetnr), K(ret));
         } else {
-          if (lib::is_mysql_mode() && (type == ObLongTextType || type == ObJsonType || type == ObGeometryType)) {
-            // issue: 52728955, 52735855, 52731784, 52734963, 52729976
-            // compat mysql .net driver 5.7, longblob, json, gis length is max u32
-            length = UINT32_MAX;
-          } else if (lib::is_mysql_mode() && tc == ObTextTC) {
+          if (lib::is_mysql_mode() && tc == ObTextTC) {
             // compat mysql-jdbc 8.x for judge text type by length
             length = static_cast<uint32_t>(ObAccuracy::MAX_ACCURACY[type].get_length() - 1);
           } else {
diff --git a/src/sql/ob_result_set.cpp b/src/sql/ob_result_set.cpp
index 946462cf0..3112dfa50 100644
--- a/src/sql/ob_result_set.cpp
+++ b/src/sql/ob_result_set.cpp
@@ -1716,7 +1716,15 @@ void ObResultSet::replace_lob_type(const ObSQLSessionInfo &session,
       }
     }
     LOG_TRACE("init field", K(is_use_lob_locator), K(field), K(mfield.type_));
-  } else {
+  } else { // mysql mode
+    // issue: 52728955, 52735855, 52731784, 52734963, 52729976
+    // compat mysql .net driver 5.7, longblob, json, gis length is max u32
+    if (mfield.type_ == obmysql::EMySQLFieldType::MYSQL_TYPE_LONG_BLOB
+        || mfield.type_ == obmysql::EMySQLFieldType::MYSQL_TYPE_JSON
+        || mfield.type_ == obmysql::EMySQLFieldType::MYSQL_TYPE_GEOMETRY) {
+      mfield.length_ = UINT32_MAX;
+    }
+
     if (mfield.type_ == obmysql::EMySQLFieldType::MYSQL_TYPE_TINY_BLOB ||
         mfield.type_ == obmysql::EMySQLFieldType::MYSQL_TYPE_MEDIUM_BLOB ||
         mfield.type_ == obmysql::EMySQLFieldType::MYSQL_TYPE_LONG_BLOB) {