**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 auto * select_query = query->as<ASTSelectQuery>();
    if (!select_query)
        return {};
    auto [array_join_expression_list, is_array_join_left] = select_query->arrayJoinExpressionList();
    if (!array_join_expression_list)
        return src_columns;
    getRootActionsNoMakeSet(array_join_expression_list, true, actions, false);
    auto array_join = addMultipleArrayJoinAction(actions, is_array_join_left);
    auto sample_columns = actions->getResultColumns();
    array_join->prepare(sample_columns);
    actions = std::make_shared<ActionsDAG>(sample_columns);
    NamesAndTypesList new_columns_after_array_join;
    NameSet added_columns;
    for (auto & column : actions->getResultColumns())
    {
        if (syntax->array_join_result_to_source.count(column.name))
        {
            new_columns_after_array_join.emplace_back(column.name, column.type);
            added_columns.emplace(column.name);
        }
    }
    for (const auto & column : src_columns)
        if (added_columns.count(column.name) == 0)
            new_columns_after_array_join.emplace_back(column.name, column.type);
    return new_columns_after_array_join;
}
NamesAndTypesList ExpressionAnalyzer::analyzeJoin(ActionsDAGPtr & actions, const NamesAndTypesList & src_columns)