Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18709#discussion_r131964192
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala
 ---
    @@ -217,6 +218,7 @@ case class CatalogTable(
         owner: String = "",
         createTime: Long = System.currentTimeMillis,
         lastAccessTime: Long = -1,
    +    createVersion: String = "",
    --- End diff --
    
    The reason why I did not set the current version by default is that I am 
afraid some bugs might use the newer version to overwrite the original value 
that is read from catalog. Thus, I am a little bit conservative here. 
    
    I like your first proposal. `2.2 or prior` looks good to me. It is better 
than an empty string. 


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