[jira] [Commented] (DRILL-1937) Disable internal function SINGLE_VALUE()

["Sean Hsuan-Yi Chu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-1937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14311488#comment-14311488 ] 

Sean Hsuan-Yi Chu commented on DRILL-1937:
------------------------------------------

A new patch due to rebasing; Passed all tests

> Disable internal function SINGLE_VALUE() 
> -----------------------------------------
>
>                 Key: DRILL-1937
>                 URL: https://issues.apache.org/jira/browse/DRILL-1937
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: SQL Parser
>    Affects Versions: 0.8.0
>            Reporter: Victoria Markman
>            Assignee: Aman Sinha
>             Fix For: 0.8.0
>
>         Attachments: DRILL-1937.1.patch
>
>
> {code}
> #Fri Jan 02 21:20:47 EST 2015
> git.commit.id.abbrev=b491cdb
> {code}
> It is dangerous to have an internal function be exposed to users.
> What if one day user decided to write a UDF with the same signature ?
> {code}
> 0: jdbc:drill:schema=dfs> select SINGLE_VALUE(1) from `t.json`;
> +--+
> |  |
> +--+
> +--+
> No rows selected (0.111 seconds)
> {code}



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