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https://issues.apache.org/jira/browse/CALCITE-7454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18069709#comment-18069709
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Magnus Mogren commented on CALCITE-7454:
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Hmm.. it is even a connection property to specify your own RelDataTypeSystem.

[https://calcite.apache.org/javadocAggregate/org/apache/calcite/config/CalciteConnectionProperty.html#TYPE_SYSTEM]

 

And the documentation for the interface states that the isCaseSensitive() 
method should control if a type is treated in a case sensitive manor or not.

[https://calcite.apache.org/javadocAggregate/org/apache/calcite/rel/type/RelDataTypeSystem.html#isCaseSensitive(org.apache.calcite.sql.type.SqlTypeName)]


Whats the point in beeing able to specify a custom RelDataTypeSystem if the 
implementation is not used?

> CSV adapter does not respect case sensitive setting
> ---------------------------------------------------
>
>                 Key: CALCITE-7454
>                 URL: https://issues.apache.org/jira/browse/CALCITE-7454
>             Project: Calcite
>          Issue Type: Bug
>          Components: csv-adapter
>    Affects Versions: 1.41.0
>            Reporter: Magnus Mogren
>            Assignee: krooswu
>            Priority: Major
>
> The CSV adapter does not respect the case sensitive setting.
> I have tried to use a RelDataTypeSystem class that returns false for the 
> method isCaseSensitive.
> I have tried both flavor FILTERABLE and SCANNABLE.
>  
> I looked att the code for org.apache.calcite.adapter.file.CsvEnumerator and 
> the method moveNext() always compares to the filterValue using equals.
> Guess it should do equalsIgnoreCase if case sensitivity is turned off.



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