**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))



}
namespace DB
{
struct SubqueryForSet;
class InterpreterSelectWithUnionQuery;
class Context;
class QueryPlan;
struct TreeRewriterResult;
using TreeRewriterResultPtr = std::shared_ptr<const TreeRewriterResult>;
/** Interprets the SELECT query. Returns the stream of blocks with the results of the query before `to_stage` stage.
  */
class InterpreterSelectQuery : public IInterpreterUnionOrSelectQuery
{
public:
    /**
     * query_ptr
     * - A query AST to interpret.
     *
     * required_result_column_names
     * - don't calculate all columns except the specified ones from the query
     *  - it is used to remove calculation (and reading) of unnecessary columns from subqueries.
     *   empty means - use all columns.
     */
    InterpreterSelectQuery(
        const ASTPtr & query_ptr_,
        ContextPtr context_,
        const SelectQueryOptions &,