Github user maropu commented on the issue:
https://github.com/apache/spark/pull/17758
yea, I think that is an expected behaviour, actually, some operations of
`DataFrame/Dataset` accepts the duplication. e.g.,
```
scala> Seq((1, 2)).toDF("a", "a").show
+---+---+
| a| a|
+---+---+
| 1| 2|
+---+---+
```
Also, the original motivation of this pr does not intend to change existing
behaviour.
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