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Posted to issues@hive.apache.org by "Pengcheng Xiong (JIRA)" <ji...@apache.org> on 2015/06/01 20:06:17 UTC
[jira] [Assigned] (HIVE-9897) Issue a warning when using an
existing table/view name as an alias in a with statement.
[ https://issues.apache.org/jira/browse/HIVE-9897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Pengcheng Xiong reassigned HIVE-9897:
-------------------------------------
Assignee: Pengcheng Xiong
> 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
> Assignee: Pengcheng Xiong
> 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.
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