**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 (finished_transform)
        prepareTotals();
    else
        ISimpleTransform::work();
}
void TotalsHavingTransform::transform(Chunk & chunk)
{
    
    if (overflow_row)
    {
        const auto & info = chunk.getChunkInfo();
        if (!info)
            throw Exception("Chunk info was not set for chunk in TotalsHavingTransform.", ErrorCodes::LOGICAL_ERROR);
        const auto * agg_info = typeid_cast<const AggregatedChunkInfo *>(info.get());
        if (!agg_info)
            throw Exception("Chunk should have AggregatedChunkInfo in TotalsHavingTransform.", ErrorCodes::LOGICAL_ERROR);
        if (agg_info->is_overflows)
        {
            overflow_aggregates = std::move(chunk);
            return;
        }
    }
    if (!chunk)