Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/10706
@kamalcoursera you could use a predicate scalar subquery here, i.e.:
```sql
select runon as runon
case
when (select max(true) from sqltesttable b where b.key = a.key
and group = 'vowels') then 'vowels'
else 'consonants'
end as group,
key as key,
someint as someint
from sqltesttable a;
```
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