**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))



{
    auto num_columns = chunk.getNumColumns();
    for (size_t col = 0; col < num_columns; ++col)
    {
        const auto & current = chunk.getColumns()[col];
        if (const auto * column = typeid_cast<const ColumnAggregateFunction *>(current.get()))
        {
            auto & totals_column = typeid_cast<ColumnAggregateFunction &>(*current_totals[col]);
            assert(totals_column.size() == 1);
            
            
            const ColumnAggregateFunction::Container & vec = column->getData();
            size_t size = vec.size();
            if (filter && filter->size() != size)
                throw Exception("Filter has size which differs from column size", ErrorCodes::LOGICAL_ERROR);
            if (filter)
            {
                for (size_t row = 0; row < size; ++row)
                    if ((*filter)[row])
                        totals_column.insertMergeFrom(vec[row]);
            }
            else
            {
                for (size_t row = 0; row < size; ++row)
                    totals_column.insertMergeFrom(vec[row]);
            }
        }
    }
}
void TotalsHavingTransform::prepareTotals()