**Describe what's wrong**

Query with rollup using same selected field name as the name of underlying column reports structure mismatch

**Does it reproduce on recent release?**

yes

**How to reproduce**

`21.9.2.17`

```sql
CREATE TABLE test
(
    `d` DateTime,
    `a` LowCardinality(String),
    `b` UInt64
)
ENGINE = MergeTree
PARTITION BY toDate(d)
ORDER BY d;

SELECT *
FROM (
    SELECT
        a,
        max((d, b)).2 AS value
    FROM test
    GROUP BY rollup(a)
)
WHERE a <> '';
```

**Expected behavior**

This used to return an ok result on v21.8

**Error message and/or stacktrace**

> Code: 352. DB::Exception: Block structure mismatch in (columns with identical name must have identical structure) stream: different columns:
> notEquals(a, '') LowCardinality(UInt8) ColumnLowCardinality(size = 0, UInt8(size = 0), ColumnUnique(size = 1, UInt8(size = 1)))
> notEquals(a, '') LowCardinality(UInt8) Const(size = 0, ColumnLowCardinality(size = 1, UInt8(size = 1), ColumnUnique(size = 2, UInt8(size = 2)))). (AMBIGUOUS_COLUMN_NAME) (version 21.9.2.17 (official build))



if (query.limit_with_ties && apply_offset)
            {
                executeLimit(query_plan);
            }
            
            
            if (!to_aggregation_stage)
            {
                
                executeProjection(query_plan, expressions.final_projection);
            }
            
            executeExtremes(query_plan);
            bool limit_applied = apply_prelimit || (query.limit_with_ties && apply_offset);
            
            
            
            
            
            
            if (apply_limit && !limit_applied && apply_offset)
                executeLimit(query_plan);
            if (apply_offset)
                executeOffset(query_plan);
        }
    }
    if (!subqueries_for_sets.empty() && (expressions.hasHaving() || query_analyzer->hasGlobalSubqueries()))
        executeSubqueriesInSetsAndJoins(query_plan, subqueries_for_sets);
}
static StreamLocalLimits getLimitsForStorage(const Settings & settings, const SelectQueryOptions & options)