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https://issues.apache.org/jira/browse/CSV-121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028719#comment-14028719
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Gary Gregory commented on CSV-121:
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Playing devil's advocate here. The only case where I have seen empty column
names is when looking at certain SQL result sets where a column value is the
result of a computation for example, SELECT 1+COLUMNX FROM SOMETABLE. In this
case, this result has one column but no column name. In SQL you can usually
assign a label to a column but you do not have to. Therefore, if your CSV file
is the result of a database export, it is quite possible to end up with empty
column names mixed with real column names.
> Exception that the header contains duplicate names when the column names are
> empty.
> -----------------------------------------------------------------------------------
>
> Key: CSV-121
> URL: https://issues.apache.org/jira/browse/CSV-121
> Project: Commons CSV
> Issue Type: Bug
> Reporter: Sebastian Hardt
>
> When having a header like a,,c,d,, an IllegalArgumentException("The header
> contains duplicate names: " +Arrays.toString(header) is thrown because empty
> header names are treated as a header with name. I sended in a pullrequest at
> github: https://github.com/apache/commons-csv/pull/2
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