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From "Mario Konschake (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-9897) Issue a warning when using an existing table/view name as an alias in a with statement.
Date Mon, 09 Mar 2015 14:22:38 GMT
Mario Konschake created HIVE-9897:
-------------------------------------

             Summary: 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 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 table name in a WITH statement is recommended.



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