**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))



"Derived window definition '{}' is not allowed to override PARTITION BY",
                definition.formatForErrorMessage());
        }
        if (definition.order_by && !parent.order_by.empty())
        {
            throw Exception(ErrorCodes::BAD_ARGUMENTS,
                "Derived window definition '{}' is not allowed to override a non-empty ORDER BY",
                definition.formatForErrorMessage());
        }
        if (!parent.frame.is_default)
        {
            throw Exception(ErrorCodes::BAD_ARGUMENTS,
                "Parent window '{}' is not allowed to define a frame: while processing derived window definition '{}'",
                definition.parent_window_name,
                definition.formatForErrorMessage());
        }
    }
    if (definition.partition_by)
    {
        for (const auto & column_ast : definition.partition_by->children)
        {
            const auto * with_alias = dynamic_cast<const ASTWithAlias *>(
                column_ast.get());
            if (!with_alias)
            {
                throw Exception(ErrorCodes::BAD_ARGUMENTS,
                    "Expected a column in PARTITION BY in window definition,"
                    " got '{}'",
                    column_ast->formatForErrorMessage());
            }