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https://issues.apache.org/jira/browse/SPARK-16726?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-16726:
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Component/s: SQL
> Improve `Union/Intersect/Except` error messages on incompatible types
> ---------------------------------------------------------------------
>
> Key: SPARK-16726
> URL: https://issues.apache.org/jira/browse/SPARK-16726
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Dongjoon Hyun
> Assignee: Dongjoon Hyun
> Priority: Minor
> Fix For: 2.1.0
>
>
> Currently, `UNION/INTERSECT/EXCEPT` query on incompatible types shows a
> misleading error message like `unresolved operator Union`. We had better show
> a more correct message. This will help users in the situation of
> [SPARK-16704|https://issues.apache.org/jira/browse/SPARK-16704]
> h4. Before
> {code}
> scala> sql("select 1,2,3 union (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: unresolved operator 'Union;
> scala> sql("select 1,2,3 intersect (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: unresolved operator 'Intersect;
> scala> sql("select 1,2,3 except (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: unresolved operator 'Except;
> {code}
> h4. After
> {code}
> scala> sql("select 1,2,3 union (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: Union can only be performed on tables
> with the compatible column types. The first table has `[IntegerType,
> IntegerType, IntegerType]` and second table has `[IntegerType,
> ArrayType(IntegerType,false), IntegerType]`. The 2th column is incompatible;
> scala> sql("select 1,2,3 intersect (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: Intersect can only be performed on
> tables with the compatible column types. The first table has `[IntegerType,
> IntegerType, IntegerType]` and second table has `[IntegerType,
> ArrayType(IntegerType,false), IntegerType]`. The 2th column is incompatible;
> scala> sql("select 1,2,3 except (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: Except can only be performed on
> tables with the compatible column types. The first table has `[IntegerType,
> IntegerType, IntegerType]` and second table has `[IntegerType,
> ArrayType(IntegerType,false), IntegerType]`. The 2th column is incompatible;
> {code}
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