codelipenghui commented on code in PR #17948:
URL: https://github.com/apache/pulsar/pull/17948#discussion_r990613617


##########
pulsar-common/src/main/java/org/apache/pulsar/common/protocol/schema/SchemaHash.java:
##########
@@ -55,15 +82,115 @@ public static SchemaHash of(SchemaData schemaData) {
     }
 
     public static SchemaHash of(SchemaInfo schemaInfo) {
-        return of(schemaInfo == null ? new byte[0] : schemaInfo.getSchema(),
+        return of(schemaInfo == null ? null : schemaInfo.getSchema(),
                 schemaInfo == null ? null : schemaInfo.getType());
     }
 
-    public static SchemaHash of(byte[] schemaBytes, SchemaType schemaType) {
-        return new SchemaHash(hashFunction.hashBytes(schemaBytes), schemaType);
+    public static SchemaHash of() {

Review Comment:
   nit:
   ```suggestion
       public static SchemaHash empty() {
   ```



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