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From "James Mayfield (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1916) Change Default Alias For Aggregated Columns (_c1)
Date Fri, 14 Jan 2011 23:47:47 GMT
Change Default Alias For Aggregated Columns (_c1)
-------------------------------------------------

                 Key: HIVE-1916
                 URL: https://issues.apache.org/jira/browse/HIVE-1916
             Project: Hive
          Issue Type: Improvement
          Components: Query Processor
         Environment: All
            Reporter: James Mayfield
            Priority: Minor


Problem:
When running a Hive query that aggregates (does a group by operation), Hive will automatically
name this column _c0, _c1, _c2, etc.. This is a problem because Hive will not then execute
a query against a column that begins with "_" and then the user has to manually input back-ticks
in order to get the query to run.

Potential Solution:
Hive should by default call these columns by their query assignment like "sum_active30day_users"
or if that is not possible, call it something simple like "column_1" so that users can then
query the new column without adding special back-ticks.

Example Query:
SELECT a.ds, COUNT(a.num_accounts)

Example Result:
ds, count_num_accounts OR ds, column_1

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