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