Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/17249
Great. I also verified the patch.
```scala
scala> sql("SELECT a, b FROM t1").show
+---+---+
| a| b|
+---+---+
|100|200|
+---+---+
scala> sql("SELECT * FROM t1").show
+---+---+-----+---+----+
| a| b|dummy|day|hour|
+---+---+-----+---+----+
|100|200| null| 1| 01|
+---+---+-----+---+----+
```
Thank you so much, @budde and @cloud-fan .
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