morningman commented on a change in pull request #2979: Incomplete support 
Array type (#2871)
URL: https://github.com/apache/incubator-doris/pull/2979#discussion_r386750847
 
 

 ##########
 File path: be/src/util/mysql_row_buffer.cpp
 ##########
 @@ -67,6 +71,25 @@ MysqlRowBuffer::~MysqlRowBuffer() {
     }
 }
 
+void MysqlRowBuffer::open_dynamic_mode() {
+    if (_dynamic_mode == 0) {
+        *_pos++ = 254;
+        // write length when dynamic mode close
+        _len_pos = _pos;
+        _pos = _pos + 8;
+    }
+    _dynamic_mode++;
+}
+
+void MysqlRowBuffer::close_dynamic_mode() {
+    _dynamic_mode--;
+
+    if (_dynamic_mode == 0) {
 
 Review comment:
   ```suggestion
       if (NOT_DYNAMIC_MODE) {
   ```

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