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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