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https://issues.apache.org/jira/browse/IMPALA-1285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118864#comment-17118864
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Shant Hovsepian commented on IMPALA-1285:
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More complex subqueries such as this one can be determined to be scalar at plan
time instead of runtime.
> Subquery with group by and where could realize the result has one row.
> ----------------------------------------------------------------------
>
> Key: IMPALA-1285
> URL: https://issues.apache.org/jira/browse/IMPALA-1285
> Project: IMPALA
> Issue Type: Task
> Components: Frontend
> Affects Versions: Impala 2.0
> Reporter: Nong Li
> Priority: Minor
> Labels: planner
>
> An example is tpcds q44,
> {code}
> group by ss_item_sk
> -- having avg(ss_net_profit) > 0.9*(select avg(ss_net_profit) rank_col
> -- from store_sales
> -- where ss_store_sk = 4
> -- group by ss_store_sk)
> {code}
> We should recognize that there is a single eq predicate and a single grouping
> column.
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