**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))



break;
                    }
            }
            bool apply_limit = options.to_stage != QueryProcessingStage::WithMergeableStateAfterAggregation;
            bool apply_prelimit = apply_limit &&
                                  query.limitLength() && !query.limit_with_ties &&
                                  !hasWithTotalsInAnySubqueryInFromClause(query) &&
                                  !query.arrayJoinExpressionList().first &&
                                  !query.distinct &&
                                  !expressions.hasLimitBy() &&
                                  !settings.extremes &&
                                  !has_withfill;
            bool apply_offset = options.to_stage != QueryProcessingStage::WithMergeableStateAfterAggregationAndLimit;
            if (apply_prelimit)
            {
                executePreLimit(query_plan, !apply_offset);
            }
            /** If there was more than one stream,
              * then DISTINCT needs to be performed once again after merging all streams.
              */
            if (!from_aggregation_stage && query.distinct)
                executeDistinct(query_plan, false, expressions.selected_columns, false);
            if (!from_aggregation_stage && expressions.hasLimitBy())
            {
                executeExpression(query_plan, expressions.before_limit_by, "Before LIMIT BY");
                executeLimitBy(query_plan);
            }
            executeWithFill(query_plan);