**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))



if (storage)
    {
        table_lock = storage->lockForShare(context->getInitialQueryId(), context->getSettingsRef().lock_acquire_timeout);
        table_id = storage->getStorageID();
        if (!metadata_snapshot)
            metadata_snapshot = storage->getInMemoryMetadataPtr();
    }
    if (has_input || !joined_tables.resolveTables())
        joined_tables.makeFakeTable(storage, metadata_snapshot, source_header);
    
    if (!has_input && joined_tables.tablesCount() > 1)
    {
        rewriteMultipleJoins(query_ptr, joined_tables.tablesWithColumns(), context->getCurrentDatabase(), context->getSettingsRef());
        joined_tables.reset(getSelectQuery());
        joined_tables.resolveTables();
        if (storage && joined_tables.isLeftTableSubquery())
        {
            
            storage = nullptr;
            table_lock.reset();
            table_id = StorageID::createEmpty();
            metadata_snapshot = nullptr;
        }
    }
    if (!has_input)
    {
        interpreter_subquery = joined_tables.makeLeftTableSubquery(options.subquery());
        if (interpreter_subquery)
            source_header = interpreter_subquery->getSampleBlock();
    }