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https://issues.apache.org/jira/browse/HIVE-1916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085592#comment-13085592
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Hudson commented on HIVE-1916:
------------------------------
Integrated in Hive-trunk-h0.21 #898 (See
[https://builds.apache.org/job/Hive-trunk-h0.21/898/])
HIVE-1916. Change Default Alias For Aggregated Columns (_c1) (sameerm via
nzhang)
nzhang : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1158104
Files :
* /hive/trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java
* /hive/trunk/ql/src/test/results/clientpositive/autogen_colalias.q.out
* /hive/trunk/ql/src/test/queries/clientpositive/autogen_colalias.q
* /hive/trunk/conf/hive-default.xml
> 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
> Assignee: Sameer M
> Priority: Minor
> Fix For: 0.8.0
>
> Attachments: HIVE-1916.3.patch.txt
>
>
> 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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