wu-sheng commented on code in PR #12047:
URL: https://github.com/apache/skywalking/pull/12047#discussion_r1533785182


##########
oap-server/server-storage-plugin/storage-banyandb-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/banyandb/BanyanDBConverter.java:
##########
@@ -272,5 +281,26 @@ public byte[] getBytes(String fieldName) {
             // TODO: double may be a field?
             return dataPoint.getFieldValue(fieldName);
         }
+
+        private Object defaultValue(Class<?> clazz) {
+            if (int.class.equals(clazz) || Integer.class.equals(clazz)) {
+                return 0;
+            } else if (Long.class.equals(clazz) || long.class.equals(clazz)) {
+                return 0L;
+            } else if (String.class.equals(clazz)) {
+                return "";
+            } else if (Double.class.equals(clazz) || 
double.class.equals(clazz)) {
+                return 0D;
+            } else if (StorageDataComplexObject.class.isAssignableFrom(clazz)) 
{
+                return "";
+            } else if (clazz.isEnum()) {
+                return 0L;

Review Comment:
   Enum is not a supported persistent type. Please skip this and throw the 
exception. Please refer to `ColumnTypeEsMapping`, and match the types.



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