Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14355
Hi, @hvanhovell .
There is two cases statements including mine (the second one). May I change
both? Actually, I followed the style of the previous one.
```scala
case s: Union if s.children.exists(_.output.length !=
s.children.head.output.length) =>
val firstError = s.children.find(_.output.length !=
s.children.head.output.length).get
failAnalysis(
s"Unions can only be performed on tables with the same number of
columns, " +
s"but one table has '${firstError.output.length}' columns and
another table has " +
s"'${s.children.head.output.length}' columns")
+ case Union(c) if c.exists(_.output.map(_.dataType) !=
c.head.output.map(_.dataType)) =>
+ val firstError = c.find(_.output.map(_.dataType) !=
c.head.output.map(_.dataType)).get
+ failAnalysis(
+ s"Unions can only be performed on tables with the compatible column
types, " +
+ s"but one table has '[${c.head.output.map(_.dataType).mkString(",
")}]' " +
+ s"and another table has
'[${firstError.output.map(_.dataType).mkString(", ")}]'")
```
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