**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))



*   ExpressionActionsChain chain;
      *   analyzer.appendWhere(chain);
      *   chain.addStep();
      *   analyzer.appendSelect(chain);
      *   analyzer.appendOrderBy(chain);
      *   chain.finalize();
      *
      * If only_types = true set, does not execute subqueries in the relevant parts of the query. The actions got this way
      *  shouldn't be executed, they are only needed to get a list of columns with their types.
      */
    
    ArrayJoinActionPtr appendArrayJoin(ExpressionActionsChain & chain, ActionsDAGPtr & before_array_join, bool only_types);
    bool appendJoinLeftKeys(ExpressionActionsChain & chain, bool only_types);
    JoinPtr appendJoin(ExpressionActionsChain & chain, ActionsDAGPtr & converting_join_columns);
    
    
    ActionsDAGPtr appendPrewhere(ExpressionActionsChain & chain, bool only_types, const Names & additional_required_columns);
    bool appendWhere(ExpressionActionsChain & chain, bool only_types);
    bool appendGroupBy(ExpressionActionsChain & chain, bool only_types, bool optimize_aggregation_in_order, ManyExpressionActions &);
    void appendAggregateFunctionsArguments(ExpressionActionsChain & chain, bool only_types);
    void appendWindowFunctionsArguments(ExpressionActionsChain & chain, bool only_types);
    
    bool appendHaving(ExpressionActionsChain & chain, bool only_types);
    
    ActionsDAGPtr appendOrderBy(ExpressionActionsChain & chain, bool only_types, bool optimize_read_in_order, ManyExpressionActions &);
    bool appendLimitBy(ExpressionActionsChain & chain, bool only_types);
    
};
}