**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 (overflow_aggregates)
    {
        if (totals_mode == TotalsMode::BEFORE_HAVING
            || totals_mode == TotalsMode::AFTER_HAVING_INCLUSIVE
            || (totals_mode == TotalsMode::AFTER_HAVING_AUTO
                && static_cast<double>(passed_keys) / total_keys >= auto_include_threshold))
            addToTotals(overflow_aggregates, nullptr);
    }
    totals = Chunk(std::move(current_totals), 1);
    finalizeChunk(totals);
    if (expression)
    {
        size_t num_rows = totals.getNumRows();
        auto block = finalized_header.cloneWithColumns(totals.detachColumns());
        expression->execute(block, num_rows);
        
        totals = Chunk(block.getColumns(), num_rows);
    }
}
}