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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