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https://issues.apache.org/jira/browse/CSV-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15019133#comment-15019133
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Romain Manni-Bucau commented on CSV-164:
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yep:
{code}
A,B,C,A,b2,C
1,2,3,4,5,6
{code}
A is twice a column but it is a valid CSV file - actually just renamed an
export from a proprietary tool.
> support duplicate headers
> -------------------------
>
> Key: CSV-164
> URL: https://issues.apache.org/jira/browse/CSV-164
> Project: Commons CSV
> Issue Type: Bug
> Reporter: Romain Manni-Bucau
>
> nothing prevents a CSV to have the same time the same header name so
> validation at the end of org.apache.commons.csv.CSVFormat#validate should
> likely disappear or should support a flag to disable it
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