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https://issues.apache.org/jira/browse/CALCITE-2507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16599453#comment-16599453
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Hanumath Rao Maduri commented on CALCITE-2507:
----------------------------------------------

I have opened a pull request for this issue. 

[https://github.com/apache/calcite/pull/812]

Please let me know if it is looks fine. 

> Aliasing a star in select list should throw a parsing error. 
> -------------------------------------------------------------
>
>                 Key: CALCITE-2507
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2507
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.17.0
>            Reporter: Hanumath Rao Maduri
>            Assignee: Julian Hyde
>            Priority: Minor
>             Fix For: 1.18.0
>
>
> Currently aliasing a Star column is not throwing an exception in parser. 
> There is a TODO for a simple test case (in SqlParserTest.java) to throw an 
> error in parser phase itself. 
> Change the parser grammar so as to report an error in parsing phase itself. 
> {code:java}
> // TODO: should fail in parser
> @Test public void testStarAsFails() {
> sql("select * as x from emp")
> .ok("SELECT * AS `X`\n"
> + "FROM `EMP`");
> }
> {code}



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