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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9897) Issue a warning when using an existing table/view name as an alias in a with statement.
Date Mon, 09 Mar 2015 17:42:38 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14353251#comment-14353251
] 

Gunther Hagleitner commented on HIVE-9897:
------------------------------------------

This sounds like a bug. I don't think it should use the table over the CTE. I'd suggest the
right behavior is either to either fail the query or to prefer the cte if there's conflict.
[~rhbutani] thoughts?

> Issue a warning when using an existing table/view name as an alias in a with statement.

> ----------------------------------------------------------------------------------------
>
>                 Key: HIVE-9897
>                 URL: https://issues.apache.org/jira/browse/HIVE-9897
>             Project: Hive
>          Issue Type: Improvement
>          Components: Hive
>    Affects Versions: 0.13.1
>         Environment: cdh5.3.0
>            Reporter: Mario Konschake
>            Priority: Minor
>
> Consider the following query:
> WITH
> table_a AS (
>     SELECT
>         'johndoe' AS name
>     FROM
>         my_table
> )
> SELECT
>     DISTINCT name
> FROM
>     table_a;
> Observation: 
> If a table or a view with name `table_a` exists it is used instead of the one defined
in the WITH statement.
> Expectation:
> As the expectation is ambiguous (using the alias in the WITH statement vs. using the
existing table) issuing a warning when using a existing name in a WITH statement is recommended.



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