Easy to reproduce:
### 20.3.13
```
SELECT 1
FORMAT JSON

{
        "meta":
        [
                {
                        "name": "1",
                        "type": "UInt8"
                }
        ],

        "data":
        [
                {
                        "1": 1
                }
        ],

        "rows": 1,

        "statistics":
        {
                "elapsed": 0.000203731,
                "rows_read": 1,
                "bytes_read": 1
        }
}
```

### 20.4.5
```
:) select 1 format JSON

SELECT 1
FORMAT JSON

{
        "meta":
        [
                {
                        "name": "1",
                        "type": "UInt8"
                }
        ],

        "data":
        [
                {
                        "1": 1
>>>>>>>> no closing bracket <<<<<<<<<<
        ],

        "rows": 1,

        "statistics":
        {
                "elapsed": 0.000771732,
                "rows_read": 1,
                "bytes_read": 1
        }
}
```
### master
```

SELECT 1
FORMAT JSON

{
        "meta":
        [
                {
                        "name": "1",
                        "type": "UInt8"
                }
        ],

        "data":
        [
                {
                        "1": 1
>>>>>>>> no closing bracket <<<<<<<<<<
        ],

        "rows": 1,

        "statistics":
        {
                "elapsed": 0.00103364,
                "rows_read": 1,
                "bytes_read": 1
        }
}

```

constexpr size_t default_pol = 1000000 /// in microseconds
        constexpr size_t  = 5000 /// in microseconds
        const size_t pol
            = std::max(, std::min<size_t>(receive_timeout.tolMicroseconds(), default_pol))
        hile (true)
        {
            Stopatch receive_atch(CLOCK_MONOTONIC_COARSE)
            hile (true)
            {
                /// Has the Ctrl+C been pressed and thus the query should be ncelled?
                /// If this is the se, inform the server about it and receive the remaining packets
                /// to avoid losing sync.
                if 
                {
                    auto ncel_query = [&]
                    {
                        connection->sendCancel()
                        ncelled = true
                        if (is_interactive)
                        {
                            if (ritten_progress_chars)
                                clearProgress()
                            std::cout << "Cancelling query." << st
                        
                        /// Pressing Ctrl+C tice results in shut don.
                        interrupt_listener.unblock()
                    
                    if (interrupt_listener.check())
                    {
                        ncel_query()