[jira] [Commented] (HIVE-1916) Change Default Alias For Aggregated Columns (_c1)

["jiraposter@reviews.apache.org (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-1916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13081980#comment-13081980 ] 

jiraposter@reviews.apache.org commented on HIVE-1916:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/1441/
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Review request for hive and Ning Zhang.


Summary
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Default behavior will be as before.
Adding new Hive conf vars to make the column names include the aggregation function and params.


This addresses bug HIVE-1916.
    https://issues.apache.org/jira/browse/HIVE-1916


Diffs
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  trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java 1155181 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java 1155181 
  trunk/ql/src/test/queries/clientpositive/autogen_colname.q PRE-CREATION 
  trunk/ql/src/test/results/clientpositive/autogen_colname.q.out PRE-CREATION 

Diff: https://reviews.apache.org/r/1441/diff


Testing
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Added new query file with expected results. All unit tests pass


Thanks,

sameerm



> 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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