Fix single-row subquery optimization once again#3288
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Complex single-row subqueries may have columns from both inner and outer column resolvers. When subquery is converted into plain expression we need to decrement query level only in columns from outer column resolvers.
Closes #3287.
I also added a setting for this optimization (
;OPTIMIZE_SIMPLE_SINGLE_ROW_SUBQUERIES=FALSE), it can be used if something else is still wrong.