[ https://issues.apache.org/jira/browse/DRILL-1248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16727111#comment-16727111 ]
Bridget Bevens commented on DRILL-1248: --------------------------------------- Added info and an example to GROUP BY page: https://drill.apache.org/docs/group-by-clause/ > 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 > Assignee: Arina Ielchiieva > Priority: Major > Labels: doc-complete, ready-to-commit > Fix For: 1.15.0 > > > 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 > *For documentation* > Positional / named alias are allowed in group by / order by / having clauses: > {noformat} > select length(n_name), n_regionkey from cp.`tpch/nation.parquet` group by 1, > 2; > select length(n_name) as len, n_regionkey as key from > cp.`tpch/nation.parquet` group by len, key; > select length(n_name) as len, count(*) as cnt from cp.`tpch/nation.parquet` > group by length(n_name) having cnt > 1; > select n_regionkey, n_name from cp.`tpch/nation.parquet` order by 1, 2; > select n_regionkey as r, n_name as n from cp.`tpch/nation.parquet` order by > r, n; > {noformat} -- This message was sent by Atlassian JIRA (v7.6.3#76005)