Github user actuaryzhang commented on the issue:
https://github.com/apache/spark/pull/17159
The current implementation accepts data frames with different schemas. See
issues below:
```
df <- createDataFrame(data.frame(name = c("Michael", "Andy", "Justin"), age
= c(1, 30, 19)))
union(df, df[, c(2, 1)])
name age
1 Michael 1.0
2 Andy 30.0
3 Justin 19.0
4 1.0 Michael
```
@felixcheung
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