
```
select *
from (
select 'table' as table, toInt64(10) as rows, toInt64(101) as elements
union all
select 'another table' as table, toInt64(0) as rows, toInt64(0) as elements
)
where rows - elements <> 0

DB::Exception: Block structure mismatch in Pipe::unitePipes stream: different number of columns:
table String String(size = 0), rows Int64 Int64(size = 0), elements Int64 Int64(size = 0)
table String String(size = 0), rows Int64 Int64(size = 0), elements Int64 Int64(size = 0), dummy UInt8 UInt8(size = 0) (version 21.5.3.1 (official build))
```
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
            {