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https://issues.apache.org/jira/browse/DRILL-3258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14612531#comment-14612531
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Sean Hsuan-Yi Chu commented on DRILL-3258:
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The error message makes sense. "Non-scalar sub-query used in an expression"
The user tried to apply a comparator ">" on a non-scalar (i.e., the result from
sub-query).
> Add support for non-scalar subqueries in expressions within HAVING clause
> -------------------------------------------------------------------------
>
> Key: DRILL-3258
> URL: https://issues.apache.org/jira/browse/DRILL-3258
> Project: Apache Drill
> Issue Type: Improvement
> Components: Query Planning & Optimization
> Reporter: Abhishek Girish
> Assignee: Sean Hsuan-Yi Chu
> Fix For: 1.2.0
>
>
> Drill currently does not support queries with non-scalar sub-queries (which
> return more than one row) used within expressions.
> {code:sql}
> SELECT ss_item_sk
> FROM store_sales
> GROUP BY ss_item_sk
> HAVING Avg(ss_net_profit) > 2 *
> (SELECT avg(ss_net_profit)
> FROM store_sales
> GROUP BY ss_store_sk);
> {code}
> Such queries should be supported by Drill.
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