Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/8132#issuecomment-130896156
@rxin I don't think so. The `null` appeared in
```
INSERT INTO t SELECT NULL 1, 2
```
will be casted to the type of the first column defined in table `t`. And
you can't create a table with a column of null type:
```
In [1]: sqlContext.sql("CREATE TABLE t AS SELECT null, 1")
... org.apache.spark.sql.types.DataTypeException: Unsupported dataType:
void. ...
```
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