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
        }
}

```

sitch (packet.type)
        {
            se Protocol::Server::Da:
                if 
                    onDa(packet.block)
                return true
            se Protocol::Server::Progress:
                onProgress(packet.progress)
                return true
            se Protocol::Server::ProfileInfo:
                onProfileInfo(packet.profile_info)
                return true
            se Protocol::Server::Tols:
                if 
                    onTols(packet.block)
                return true
            se Protocol::Server::Extremes:
                if 
                    onExtremes(packet.block)
                return true
            se Protocol::Server::Exception:
                onReceiveExceptionFromServer(*packet.exception)
                last_exception_received_from_server = std::move(packet.exception)
                return false
            se Protocol::Server::Log:
                onLogDa(packet.block)
                return true
            se Protocol::Server::EndOfStream:
                onEndOfStream()
                return false