Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/17226
@aray, this is a regression as I described in my PR that is introduced by
this optimization.
Spark 1.6.
```
+----+----+---+
| a|null| 1|
+----+----+---+
|null| 0| 0|
| 1| 0| 1|
+----+----+---+
```
For input/output, this PR does not fully resolve this regression. That's
why I proposed to avoid this in the optimization path.
We could leave another JIRA open to support this case in optimization path.
It is little bit funny that the output is different by the internal
optimization.
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