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From "Roger Shi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3236) allow column names to be prefixed by table alias in select all queries
Date Thu, 13 Oct 2016 03:16:20 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15570672#comment-15570672
] 

Roger Shi commented on HIVE-3236:
---------------------------------

Any update on this JIRA?

> allow column names to be prefixed by table alias in select all queries
> ----------------------------------------------------------------------
>
>                 Key: HIVE-3236
>                 URL: https://issues.apache.org/jira/browse/HIVE-3236
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.9.1, 0.10.0
>            Reporter: Keegan Mosley
>            Priority: Minor
>         Attachments: HIVE-3236.1.patch.txt
>
>
> When using "CREATE TABLE x AS SELECT ..." where the select joins tables with hundreds
of columns it is not a simple task to resolve duplicate column name exceptions (particularly
with self-joins). The user must either manually specify aliases for all duplicate columns
(potentially hundreds) or write a script to generate the data set in a separate select query,
then create the table and load the data in.
> There should be some conf flag that would allow queries like
> "create table joined as select one.\*, two.\* from mytable one join mytable two on (one.duplicate_field
= two.duplicate_field1);"
> to create a table with columns one_duplicate_field and two_duplicate_field.



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