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From "Dongjoon Hyun (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-21247) Type comparision should respect case-sensitive SQL conf
Date Wed, 05 Jul 2017 06:11:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-21247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dongjoon Hyun updated SPARK-21247:
----------------------------------
    Summary: Type comparision should respect case-sensitive SQL conf  (was: Allow case-insensitive
type equality in Set operation)

> Type comparision should respect case-sensitive SQL conf
> -------------------------------------------------------
>
>                 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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