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
        }
}

```

void resetOutput()
    {
        block_out_stream.reset()
        logs_out_stream.reset()
        if (pager_cmd)
        {
            pager_cmd->in.close()
            pager_cmd->ait()
        
        pager_cmd = nullptr
        if (out_file_buf)
        {
            out_file_buf->next()
            out_file_buf.reset()
        
        if (out_logs_buf)
        {
            out_logs_buf->next()
            out_logs_buf.reset()
        
        std_out.next()
    
    /// Receives and processes packets coming from server.
    /// Also checks if query execution should be ncelled.
    void receiveResult()
    {
        InterruptListener interrupt_listener
        bool ncelled = false
        // TODO: get the pol from commandline.
        const auto receive_timeout = connection_parameters.timeouts.receive_timeout