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https://issues.apache.org/jira/browse/DRILL-5492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arina Ielchiieva resolved DRILL-5492.
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Resolution: Fixed
> CSV reader does not validate header names, causes nonsense output
> -----------------------------------------------------------------
>
> Key: DRILL-5492
> URL: https://issues.apache.org/jira/browse/DRILL-5492
> Project: Apache Drill
> Issue Type: Sub-task
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Priority: Minor
>
> Consider the same test case as in DRILL-5491, but with a slightly different
> input file:
> {code}
> ___
> a,b,c
> d,e,f
> {code}
> The underscores represent three spaces: use spaces in the real test.
> In this case, the code discussed in DRILL-5491 finds some characters and
> happily returns the following array:
> {code}
> [" "]
> {code}
> The field name of three blanks is returned to the client to produce the
> following bizarre output:
> {code}
> 2 row(s):
>
> a
> d
> {code}
> The blank line is normally the header, but the header here was considered to
> be three blanks. (In fact, the blanks are actually printed.)
> Since the blanks were considered to be a field, the file is assumed to have
> only one field, so only the first column was returned.
> The expected behavior is that spaces are trimmed from field names, so the
> field name list would be empty and a User Error thrown. (That is, it is
> confusing to the user why a blank line produces NPE, some produce the
> {{ExecutionSetupException}} shown in DRILL-5491, and some produce blank
> headings. Behavior should be consistent.
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