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https://issues.apache.org/jira/browse/PHOENIX-1768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14375319#comment-14375319
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Serhiy Bilousov commented on PHOENIX-1768:
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[~jamestaylor] I think it would be helpful if we align on what is the vision
here:
a) SQL standard (and if so what standard exactly)
b) specific database (PostgreSQL, Oracle, MSSQL, MySQL)
c) make a best of all world (pick the best and make it work in Phoenix)
If you ask me I would go with c). This particular JIRA was filed mostly because
I have an issue when I can not really use expression on GROUP by because it
changes see: [PHOENIX-1750|https://issues.apache.org/jira/browse/PHOENIX-1750]
+ it would make it close to PostgreSQL.
Thank you
> GROUP BY should support column position as well as column alias
> ---------------------------------------------------------------
>
> Key: PHOENIX-1768
> URL: https://issues.apache.org/jira/browse/PHOENIX-1768
> Project: Phoenix
> Issue Type: Bug
> Reporter: Serhiy Bilousov
>
> In postgreSQL (and many others DBs) you can specify not only column name for
> the GROUP BY but column number (position in SELECT part) as well as column
> alias.
> see:
> http://www.postgresql.org/docs/9.4/static/queries-order.html
> http://www.postgresql.org/docs/9.4/static/sql-select.html#SQL-GROUPBY
> Adding such support would be very helpful and sometimes necessary.
> I can provide real queries example if required but basically we want
> something like this
> given query
> SELECT a, b, TRUNC(current_date(),'HOUR') AS date_truncated FROM table
> we want
> GROUP BY 1, 2
> Having just column number would cover both but having column alias would make
> queries more readable and human friendly. Plus make it one little stem closer
> to postgreSQL and SQL standard.
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