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From "Keegan Mosley (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-3236) allow column names to be prefixed by table alias in select all queries
Date Fri, 06 Jul 2012 01:00:54 GMT
Keegan Mosley created HIVE-3236:
-----------------------------------

             Summary: 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: 0.10.0, 0.9.1
            Reporter: Keegan Mosley
            Priority: Minor


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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