**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))



const auto * select_query = query_analyzer.getSelectQuery();
            for (const auto & child : select_query->select()->children)
            {
                step.addRequiredOutput(child->getColumnName());
            }
        }
        selected_columns.clear();
        selected_columns.reserve(chain.getLastStep().required_output.size());
        for (const auto & it : chain.getLastStep().required_output)
            selected_columns.emplace_back(it.first);
        has_order_by = query.orderBy() != nullptr;
        before_order_by = query_analyzer.appendOrderBy(
                chain,
                only_types || (need_aggregate ? !second_stage : !first_stage),
                optimize_read_in_order,
                order_by_elements_actions);
        if (query_analyzer.appendLimitBy(chain, only_types || !second_stage))
        {
            before_limit_by = chain.getLastActions();
            chain.addStep();
        }
        final_projection = query_analyzer.appendProjectResult(chain);
        finalize_chain(chain);
    }
    
    removeExtraColumns();
    checkActions();
}
void ExpressionAnalysisResult::finalize(const ExpressionActionsChain & chain, size_t where_step_num, const ASTSelectQuery & query)