hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Mario Konschake (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-9897) Issue a warning when using an existing table/view name as an alias in a with statement.
Date Mon, 09 Mar 2015 18:11:38 GMT

     [ https://issues.apache.org/jira/browse/HIVE-9897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mario Konschake updated HIVE-9897:
----------------------------------
    Description: 
Consider the following query:

{code:sql}
WITH
table_a AS (
    SELECT
        'johndoe' AS name
    FROM
        my_table
)

SELECT
    DISTINCT name
FROM
    table_a;
{code}

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.

  was:
Consider the following query:

{code:sql}
WITH
table_a AS (
    SELECT
        'johndoe' AS name
    FROM
        my_table
)

SELECT
    DISTINCT name
FROM
    table_a;
{code:sql}

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.


> 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:
> {code:sql}
> WITH
> table_a AS (
>     SELECT
>         'johndoe' AS name
>     FROM
>         my_table
> )
> SELECT
>     DISTINCT name
> FROM
>     table_a;
> {code}
> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message