Github user dongjoon-hyun commented on the issue: https://github.com/apache/spark/pull/22255 BTW, @rdblue recommended [key_value_metadata](https://github.com/apache/spark/pull/22255#issuecomment-418169189). Are we going to `created_by` instead of `key_value_metadata`? Could you give me some advice, @gatorsmile and @rdblue ? ``` /** Optional key/value metadata **/ 5: optional list<KeyValue> key_value_metadata /** String for application that wrote this file. This should be in the format * <Application> version <App Version> (build <App Build Hash>). * e.g. impala version 1.0 (build 6cf94d29b2b7115df4de2c06e2ab4326d721eb55) **/ 6: optional string created_by ```
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