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https://issues.apache.org/jira/browse/CALCITE-7454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18069714#comment-18069714
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Julian Hyde commented on CALCITE-7454:
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Look, I think you have a genuine feature request here. That feature would be 
case-insensitive columns. (I don't think it makes sense to make the CHAR or 
VARCHAR data type case-insensitive for the whole database. A bunch of things 
would break, including the catalog.)

It would be a big task, because we'd need to change the behavior of every 
method that compares strings, including regex, LIKE, ORDER BY. A practical 
approach to manage this would be to add a new data type.

> 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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