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https://issues.apache.org/jira/browse/DRILL-5556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16029842#comment-16029842
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Jinfeng Ni commented on DRILL-5556:
-----------------------------------
Agreed with [~amansinha100] that *, * is correct in postgres. I think in most
RDBMS, two * in a select list works same as "select col1, col1" since planer
would expand each * into a column list, based on metadata from catalog.
The duplication is handled in Project operator, before the query result is
returned to Screen operator.
> 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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