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From "Keegan Mosley (JIRA)" <>
Subject [jira] [Updated] (HIVE-3236) allow column names to be prefixed by table alias in select all queries
Date Fri, 06 Jul 2012 01:08:34 GMT


Keegan Mosley updated HIVE-3236:

    Fix Version/s: 0.10.0
           Status: Patch Available  (was: Open)
> allow column names to be prefixed by table alias in select all queries
> ----------------------------------------------------------------------
>                 Key: HIVE-3236
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.10.0, 0.9.1
>            Reporter: Keegan Mosley
>            Priority: Minor
>             Fix For: 0.10.0
>         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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