You have to provide the following information whenever possible.

**Describe the bug**
This query fails with the latest stable version 21.5.5.12. It worked with the last stable version 21.4.7.3.

**Does it reproduce on recent release?**
yes

**How to reproduce**
21.5.5.12

```
SELECT
    label,
    number
FROM
(
    SELECT
        'a' AS label,
        number
    FROM
    (
        SELECT number
        FROM numbers(10)
    )
    UNION ALL
    SELECT
        'b' AS label,
        number
    FROM
    (
        SELECT number
        FROM numbers(10)
    )
)
WHERE number IN
(
    SELECT number
    FROM numbers(5)
)
```

**Expected behavior**
Query should run without errors

**Error message and/or stacktrace**
```
Received exception from server (version 21.5.5):
Code: 49. DB::Exception: Received from localhost:9000. DB::Exception: Block structure mismatch in Pipe::unitePipes stream: different names of columns:
label String String(size = 0), number UInt64 UInt64(size = 0), 'b' String Const(size = 0, String(size = 1))
label String String(size = 0), number UInt64 UInt64(size = 0), 'a' String Const(size = 0, String(size = 1)).
```

const auto * new_predicate = &addNode(node);
                for (auto & index_node : index)
                    if (index_node == predicate)
                        index_node = new_predicate;
            }
        }
        removeUnusedActions(false);
    }
    else
    {
        
        
        NodeRawConstPtrs new_children = std::move(conjunction.rejected);
        if (new_children.size() == 1)
        {
            
            if (new_children.front()->result_type->equals(*predicate->result_type))
            {
                
                Node node;
                node.type = ActionType::ALIAS;
                node.result_name = predicate->result_name;
                node.result_type = predicate->result_type;
                node.children.swap(new_children);
                *predicate = std::move(node);
            }
            else
            {