**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))



const ASTPtr & query_,
    const TreeRewriterResultPtr & syntax_analyzer_result_,
    ContextPtr context_,
    size_t subquery_depth_,
    bool do_global,
    SubqueriesForSets subqueries_for_sets_,
    PreparedSets prepared_sets_)
    : WithContext(context_)
    , query(query_), settings(getContext()->getSettings())
    , subquery_depth(subquery_depth_)
    , syntax(syntax_analyzer_result_)
{
    
    subqueries_for_sets = std::move(subqueries_for_sets_);
    prepared_sets = std::move(prepared_sets_);
    
    
    initGlobalSubqueriesAndExternalTables(do_global);
    auto temp_actions = std::make_shared<ActionsDAG>(sourceColumns());
    columns_after_array_join = getColumnsAfterArrayJoin(temp_actions, sourceColumns());
    columns_after_join = analyzeJoin(temp_actions, columns_after_array_join);
    
    
    
    
    
    
    
    analyzeAggregation(temp_actions);
}