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https://issues.apache.org/jira/browse/SPARK-21247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-21247:
------------------------------------
Assignee: (was: Apache Spark)
> Allow case-insensitive type equality in Set operation
> -----------------------------------------------------
>
> Key: SPARK-21247
> URL: https://issues.apache.org/jira/browse/SPARK-21247
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.1
> Reporter: Dongjoon Hyun
>
> Spark supports case-sensitivity in columns. Especially, for Struct types,
> with case sensitive option, the following is supported.
> {code}
> scala> sql("select named_struct('a', 1, 'A', 2).a").show
> +--------------------------+
> |named_struct(a, 1, A, 2).a|
> +--------------------------+
> | 1|
> +--------------------------+
> scala> sql("select named_struct('a', 1, 'A', 2).A").show
> +--------------------------+
> |named_struct(a, 1, A, 2).A|
> +--------------------------+
> | 2|
> +--------------------------+
> {code}
> And vice versa, with case sensitive `false`, the following is supported.
> {code}
> scala> sql("select named_struct('a', 1).A, named_struct('A', 1).a").show
> +--------------------+--------------------+
> |named_struct(a, 1).A|named_struct(A, 1).a|
> +--------------------+--------------------+
> | 1| 1|
> +--------------------+--------------------+
> {code}
> This issue aims to support case-insensitive type comparisions in Set
> operation. Currently, SET operations fail due to case-sensitive type
> comparision failure .
> {code}
> scala> sql("SELECT struct(1 a) UNION ALL (SELECT struct(2 A))").show
> org.apache.spark.sql.AnalysisException: Union can only be performed on tables
> with the compatible column types. struct<A:int> <> struct<a:int> at the first
> column of the second table;;
> 'Union
> :- Project [named_struct(a, 1) AS named_struct(a, 1 AS `a`)#2]
> : +- OneRowRelation$
> +- Project [named_struct(A, 2) AS named_struct(A, 2 AS `A`)#3]
> +- OneRowRelation$
> {code}
> Please note that this issue does not aim to change all type comparison
> semantics.
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