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 FunctionOverloadResolverPtr & function,
        NodeRawConstPtrs children,
        std::string result_name)
{
    size_t num_arguments = children.size();
    Node node;
    node.type = ActionType::FUNCTION;
    node.function_builder = function;
    node.children = std::move(children);
    bool all_const = true;
    ColumnsWithTypeAndName arguments(num_arguments);
    for (size_t i = 0; i < num_arguments; ++i)
    {
        const auto & child = *node.children[i];
        ColumnWithTypeAndName argument;
        argument.column = child.column;
        argument.type = child.result_type;
        argument.name = child.result_name;
        if (!argument.column || !isColumnConst(*argument.column))
            all_const = false;
        arguments[i] = std::move(argument);
    }
    node.function_base = function->build(arguments);
    node.result_type = node.function_base->getResultType();
    node.function = node.function_base->prepare(arguments);
    
    if (node.function_base->isSuitableForConstantFolding())
    {
        ColumnPtr column;