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https://issues.apache.org/jira/browse/SPARK-9874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-9874.
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Resolution: Duplicate
> UnionAll operation on DataFrame doesn't check for column names
> --------------------------------------------------------------
>
> Key: SPARK-9874
> URL: https://issues.apache.org/jira/browse/SPARK-9874
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.4.0
> Reporter: Raghavendra Kumar Pandey
>
> UnionAll operation in dataFrame checks only for the column dataType. For
> example if df1 has a field id of type String and df2 has a field city of type
> String then, unionAll appends both dataFrames one after another.
> This should not be allowed. Either it should create combined schema or it
> should throw error.
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