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https://issues.apache.org/jira/browse/DRILL-5556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16028684#comment-16028684
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Paul Rogers commented on DRILL-5556:
------------------------------------
[~amansinha100], perhaps you are right. Seems that the duplication is handled
via the Project operator, not the reader. So, if Project can handle the double
*, and the reader is isolated, then the issue may not be a problem.
The plan passed to the scan operator is:
{code}
"columns" : [ "`*`" ],
{code}
That is just one star. So, duplication is handled elsewhere, probably a Project.
> Drill allows "SELECT *, *" query
> --------------------------------
>
> Key: DRILL-5556
> URL: https://issues.apache.org/jira/browse/DRILL-5556
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.10.0
> Reporter: Paul Rogers
> Priority: Minor
>
> Configure the CSV storage plugin to not read the header row. Create a simple
> CSV file:
> {code}
> 10,foo,bar
> {code}
> Issue the following nonsensical query:
> {code}
> SELECT *, * FROM `dfs.data`.`example.csv`
> {code}
> Get the following results:
> {code}
> columns,columns0
> ["10","foo","bar"],["10","foo","bar"]
> {code}
> Expected an error as using two unqualified *'s is not valid SQL.
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