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https://issues.apache.org/jira/browse/PIG-4689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14975131#comment-14975131
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Daniel Dai commented on PIG-4689:
---------------------------------
Can you add your test case to TestCSVExcelStorage?
> CSV Writes incorrect header if two CSV files are created in one script
> ----------------------------------------------------------------------
>
> Key: PIG-4689
> URL: https://issues.apache.org/jira/browse/PIG-4689
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.14.0, 0.15.0
> Reporter: Niels Basjes
> Assignee: Niels Basjes
> Attachments: PIG-4689-2015-10-06.patch, PIG-4689-20151016.patch
>
>
> From a single Pig script I write two completely different and unrelated CSV
> files; both with the flag 'WRITE_OUTPUT_HEADER'.
> The bug is that both files get the SAME header at the top of the output file
> even though the data is different.
> *Reproduction:*
> {code:title=foo.txt}
> 1
> {code}
> {code:title=bar.txt (Tab separated)}
> 1 a
> {code}
> {code:title=WriteTwoCSV.pig}
> FOO =
> LOAD 'foo.txt'
> USING PigStorage('\t')
> AS (a:chararray);
> BAR =
> LOAD 'bar.txt'
> USING PigStorage('\t')
> AS (b:chararray, c:chararray);
> STORE FOO into 'Foo'
> USING org.apache.pig.piggybank.storage.CSVExcelStorage('\t','NO_MULTILINE',
> 'UNIX', 'WRITE_OUTPUT_HEADER');
> STORE BAR into 'Bar'
> USING org.apache.pig.piggybank.storage.CSVExcelStorage('\t','NO_MULTILINE',
> 'UNIX', 'WRITE_OUTPUT_HEADER');
> {code}
> *Command:*
> {quote}pig -x local WriteTwoCSV.pig{quote}
> *Result:*
> {quote}cat Bar/part-*{quote}
> {code}
> b c
> 1 a
> {code}
> {quote}cat Foo/part-*{quote}
> {code}
> b c
> 1
> {code}
> *The error is that the {{Foo}} output has a the two column header from the
> {{Bar}} output.*
> *One of the effects is that parsing the {{Foo}} data will probably fail due
> to the varying number of columns*
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