Shant Hovsepian created IMPALA-9905:
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Summary: Allow runtime scalar subquery check when group by clause
is present
Key: IMPALA-9905
URL: https://issues.apache.org/jira/browse/IMPALA-9905
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Reporter: Shant Hovsepian
Assignee: Shant Hovsepian
We can also use a runtime scalar subquery check for subqueries that have a
scalar return type and also contain a grouping expression.
For example the following query would pass a runtime scalar check, given the
predicate on the grouping expression.
{{select * from functional.alltypes where id < (select count(bool_col) from
functional.alltypes where int_col=1 group by int_col);}}
Ideally we could detect situation like the above at plan time and avoid the
runtime scalar check all together with
[IMPALA-1285|https://issues.apache.org/jira/browse/IMPALA-1285]
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