xiaokang commented on code in PR #13430:
URL: https://github.com/apache/doris/pull/13430#discussion_r1012729193


##########
fe/fe-core/src/main/java/org/apache/doris/catalog/Index.java:
##########
@@ -30,36 +31,55 @@
 import java.io.DataOutput;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 /**
  * Internal representation of index, including index type, name, columns and 
comments.
  * This class will used in olaptable
  */
 public class Index implements Writable {
+    public static final int INDEX_ID_INIT_VALUE = -1;
+
+    @SerializedName(value = "indexId")
+    private int indexId;

Review Comment:
   set default value to -1 for compatibility



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