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https://issues.apache.org/jira/browse/DRILL-1248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15107044#comment-15107044
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Matt Keranen commented on DRILL-1248:
-------------------------------------
Is this by chance planned in a near term version?
Grouping and ordering by column aliases results in much cleaner queries by not
having to repeat CASTs in column definitions, as this is a common approach in
Drill for data loading.
> Add support for using aliases in group by
> -----------------------------------------
>
> Key: DRILL-1248
> URL: https://issues.apache.org/jira/browse/DRILL-1248
> Project: Apache Drill
> Issue Type: Improvement
> Components: SQL Parser
> Reporter: Jim Scott
> Fix For: Future
>
>
> when I select using a function and alias the resultant function value it
> won't parse properly saying the alias is ambiguous. I know that this is a
> debatable / questionable topic, but with this engine being so flexible it
> seems that in order to support all of the formatting, casting, etc.. that
> will likely occur having the group by support an alias would be a big deal.
> This in my opinion is nothing like an ordinal group by.
> This works:
> select extract(year from to_date(crimes.datetime, 'MM/DD/YYYY hh:mm:ss a'))
> from BLAH group by extract(year from to_date(crimes.datetime, 'MM/DD/YYYY
> hh:mm:ss a'));
> This doesn't:
> select extract(year from to_date(crimes.datetime, 'MM/DD/YYYY hh:mm:ss a'))
> as mygroup from BLAH group by mygroup
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