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https://issues.apache.org/jira/browse/SPARK-16726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392899#comment-15392899
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Apache Spark commented on SPARK-16726:
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User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/14355
> Improve error message for `Union` queries for incompatible types
> ----------------------------------------------------------------
>
> Key: SPARK-16726
> URL: https://issues.apache.org/jira/browse/SPARK-16726
> Project: Spark
> Issue Type: Improvement
> Reporter: Dongjoon Hyun
> Priority: Minor
>
> Currently, `UNION` query on incompatible types shows a misleading error
> message, e.g., `unresolved operator Union`. We had better show a more correct
> message.
> h4. Before
> {code}
> scala> sql("select 1 union (select array(1))")
> org.apache.spark.sql.AnalysisException: unresolved operator 'Union;
> {code}
> h4. After
> {code}
> scala> sql("select 1 union (select array(1))")
> org.apache.spark.sql.AnalysisException: Unions can only be performed on
> tables with the compatible column types, but one table has '[IntegerType]'
> and another table has '[ArrayType(IntegerType,false)]';
> {code}
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