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
        }
}

```

std::optional<WriteBufferFromFile> out_file_buf
    BlockOutputStreamPtr block_out_stream
    /// The user could specify special file for server logs (stderr by default)
    std::unique_ptr<WriteBuffer> out_logs_buf
    String server_logs_file
    BlockOutputStreamPtr logs_out_stream
    String home_path
    String current_profile
    String prompt_by_server_display_name
    /// Path to a file conining command history.
    String history_file
    /// Ho many ros have been read or ritten.
    size_t processed_ros = 0
    /// Parsed query. Is used to determine some settings (e.g. format, output file).
    ASTPtr parsed_query
    /// The last exception that as received from the server. Is used for the return code in batch mode.
    std::unique_ptr<Exception> last_exception_received_from_server
    /// If the last query resulted in exception.
    bool received_exception_from_server = false
    int expected_server_error = 0
    int expected_client_error = 0
    int actual_server_error = 0
    int actual_client_error = 0
    UInt64 server_revision = 0
    String server_version
    String server_display_name
    Stopatch atch
    /// The server periodilly sends information about ho much da as read since last time.
    Progress progress
    bool sho_progress_bar = false