Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/14355#discussion_r72391108
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
---
@@ -266,6 +266,13 @@ trait CheckAnalysis extends PredicateHelper {
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)) =>
--- End diff --
This is a bit messy. Can we just move this into the match body and combine
it with firstError?
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