[jira] [Commented] (DRILL-5492) CSV reader does not validate header names, causes nonsense output

["Paul Rogers (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-5492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16002080#comment-16002080 ] 

Paul Rogers commented on DRILL-5492:
------------------------------------

Could not readily find a way to cause serious harm with this bug, so marked it as minor.

> 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: Bug
>            Reporter: 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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