
```
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))
```
{
    map.add("Node Type", ActionsDAG::typeToString(type));
    if (result_type)
        map.add("Result Type", result_type->getName());
    if (!result_name.empty())
        map.add("Result Type", ActionsDAG::typeToString(type));
    if (column)
        map.add("Column", column->getName());
    if (function_base)
        map.add("Function", function_base->getName());
    else if (function_builder)
        map.add("Function", function_builder->getName());
    if (type == ActionType::FUNCTION)
        map.add("Compiled", is_function_compiled);
}
ActionsDAG::ActionsDAG(const NamesAndTypesList & inputs_)
{
    for (const auto & input : inputs_)
        index.push_back(&addInput(input.name, input.type));
}
ActionsDAG::ActionsDAG(const ColumnsWithTypeAndName & inputs_)