esevastyanov commented on a change in pull request #8157: Enum of 
ResponseContext keys
URL: https://github.com/apache/incubator-druid/pull/8157#discussion_r309430626
 
 

 ##########
 File path: 
processing/src/main/java/org/apache/druid/query/context/ResponseContext.java
 ##########
 @@ -76,56 +138,128 @@ public static ResponseContext createEmpty()
     return DefaultResponseContext.createEmpty();
   }
 
-  protected abstract Map<String, Object> getDelegate();
-
-  public Object put(String key, Object value)
+  public static ResponseContext deserialize(String responseContext, 
ObjectMapper objectMapper) throws IOException
   {
-    return getDelegate().put(key, value);
+    final Map<String, Object> delegate = objectMapper.readValue(
+        responseContext,
+        JacksonUtils.TYPE_REFERENCE_MAP_STRING_OBJECT
+    );
+    return new ResponseContext()
+    {
+      @Override
+      protected Map<String, Object> getDelegate()
+      {
+        return delegate;
+      }
+    };
   }
 
-  public Object get(String key)
+  protected abstract Map<String, Object> getDelegate();
 
 Review comment:
   Updated the delegate type to `Map<BaseKey, Object>`

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