[jira] [Work logged] (CSV-239) Cannot get headers in column order from CSVRecord

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[jira] [Work logged] (CSV-239) Cannot get headers in column order from CSVRecord

JIRA jira@apache.org

     [ https://issues.apache.org/jira/browse/CSV-239?focusedWorklogId=248396&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-248396 ]

ASF GitHub Bot logged work on CSV-239:
--------------------------------------

                Author: ASF GitHub Bot
            Created on: 25/May/19 05:56
            Start Date: 25/May/19 05:56
    Worklog Time Spent: 10m
      Work Description: davidmoten commented on issue #41: [CSV-239] Add CSVRecord.getHeaderNames and allow duplicate headers
URL: https://github.com/apache/commons-csv/pull/41#issuecomment-495862040
 
 
   Yeah no problem with the warnings. Not sure how I provoked them! Thanks for the merge. The next obvious question is when will you build a release?
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 248396)
    Time Spent: 2.5h  (was: 2h 20m)

> Cannot get headers in column order from CSVRecord
> -------------------------------------------------
>
>                 Key: CSV-239
>                 URL: https://issues.apache.org/jira/browse/CSV-239
>             Project: Commons CSV
>          Issue Type: Improvement
>          Components: Parser
>    Affects Versions: 1.6
>            Reporter: Dave Moten
>            Priority: Minor
>             Fix For: 1.7
>
>          Time Spent: 2.5h
>  Remaining Estimate: 0h
>
> I have a use case where I read many lines from an arbitrary csv file with a given CSVFormat as List<CSVRecord>, transform that list and then want to write the transformed list to another file. 
> When I specify the format as CSVFormat.DEFAULT.withFirstRecordAsHeader() the headers from the first line are available in the CSVRecord object via the CSVRecord.toMap object but their column positions are not (the iteration of the returned map does not reflect column order). Consequently I cannot write a header line in the correct order to the output csv file (which I do when the first CSVRecord is to be written).
> Another option would be to be to ensure that the CSVPrinter object writes the header on the first call to CSVPrinter.printRecord but we should also be able to cover the user case where we are writing to a non-csv format and we still want to write the headers in the correct order. 
> My preference at minimum is that the headers with column order are available from CSVRecord (after all the data to supply this is already present in CVSRecord). The addition of a method `getHeaders` returning a `List<String>` would do the job. I'm happy to submit a PR if desired.
> I've marked this as of minor importance but I think it's a pretty important flaw in the library at the moment that prevents event the simplest of round-trip (read then write) scenarios when the headers are read from the file rather than known up-front.



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