**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))



{
    for (auto & col : block)
    {
        if (!col.column)
        {
            if (isNotCreatable(col.type->getTypeId()))
            {
                if (throw_if_cannot_create_column)
                    throw Exception("Cannot create column of type " + col.type->getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
                return false;
            }
            col.column = col.type->createColumn();
        }
        else if (!col.column->empty())
            col.column = col.column->cloneEmpty();
    }
    return true;
}
ExpressionAnalyzerData::~ExpressionAnalyzerData() = default;
ExpressionAnalyzer::ExtractedSettings::ExtractedSettings(const Settings & settings_)
    : use_index_for_in_with_subqueries(settings_.use_index_for_in_with_subqueries)
    , size_limits_for_set(settings_.max_rows_in_set, settings_.max_bytes_in_set, settings_.set_overflow_mode)
    , distributed_group_by_no_merge(settings_.distributed_group_by_no_merge)
{}
ExpressionAnalyzer::~ExpressionAnalyzer() = default;
ExpressionAnalyzer::ExpressionAnalyzer(