**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 (!options.only_analyze || options.modify_inplace)
        {
            if (syntax_analyzer_result->rewrite_subqueries)
            {
                
                interpreter_subquery = joined_tables.makeLeftTableSubquery(options.subquery());
            }
        }
        if (interpreter_subquery)
        {
            
            if (query_analyzer->hasAggregation())
                interpreter_subquery->ignoreWithTotals();
        }
        required_columns = syntax_analyzer_result->requiredSourceColumns();
        if (storage)
        {
            
            if (row_policy_filter)
            {
                filter_info = std::make_shared<FilterDAGInfo>();
                filter_info->column_name = generateFilterActions(filter_info->actions, required_columns);
                auto required_columns_from_filter = filter_info->actions->getRequiredColumns();
                for (const auto & column : required_columns_from_filter)
                {
                    if (required_columns.end() == std::find(required_columns.begin(), required_columns.end(), column.name))
                        required_columns.push_back(column.name);
                }
            }
            source_header = metadata_snapshot->getSampleBlockForColumns(required_columns, storage->getVirtuals(), storage->getStorageID());