Github user maropu commented on the issue:

    https://github.com/apache/spark/pull/18756
  
    In the most cases of `SELECT` statements,  `default_value` is `NULL` by 
default. So, I firstly thought non-specified columns were filled with `NULL`. 
Anyway, we still have any chance to implement the concept of `DEFAULT`, too?
    ```
    postgresql doc:
    DEFAULT default_expr
    ...
    The default expression will be used in any insert operation that does not 
specify a value 
    for the column. If there is no default for a column, then the default is 
null.
    ```


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