zuoyebushiwo commented on issue #2391:
URL: https://github.com/apache/hudi/issues/2391#issuecomment-752341051
> I think only `put()` calls populate the underlying hashtable. if you
notice, `Properties` has the same behavior
>
> ```
> Properties properties = new Properties();
> properties.put("key1", "value1");
>
> System.out.println(properties.containsKey("key1"));
> Properties newProperties = new Properties(properties);
> System.out.println(newProperties.containsKey("key1"));
> ```
>
> prints
>
> ```
> true
> false
> ```
think for you reply. i got it.
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