Regression when referencing outer joined column from correlated subquery

[lukaseder]

This query used to work just fine in 1.4.200:

with t (a, b, c) as (select 1, 1, 1)
select t1.a 
from t t1 
  left outer join t t2 
  on t1.b = t2.a
where (select t2.c) is not null
order by t1.A

Producing

|A  |
|---|
|1  |

In H2 2.0.202, it produces the following error:

SQL Error [90016] [90016]: Column "T2.C" must be in the GROUP BY list;

[katzyn]

This issue is caused by a single-row subquery optimization. (SELECT T2.C) is replaced with T2.C and replacement expression doesn't work because ExpressionColumn.queryLevel also needs to be decremented by 1.