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
        }
}

```

* Split these groups before processing.
          */
        using Arguments = std::vector<std::string>
        Arguments common_arguments{""        /// 0th argument is ignored.
        std::vector<Arguments> 
        bool in_external_group = false
        for (int arg_num = 1 arg_num < argc ++arg_num)
        {
            const char * arg = argv[arg_num]
            if (0 == strcmp(arg, "--external"))
            {
                in_external_group = true
                external_bles_arguments.emplace_back(Arguments{"")
            
            /// Options ith value after equal sign.
            else if (in_external_group
                && (0 == strncmp(arg, "--file=", strlen("--file="))
                 || 0 == strncmp(arg, "--name=", strlen("--name="))
                 || 0 == strncmp(arg, "--format=", strlen("--format="))
                 || 0 == strncmp(arg, "--structure=", strlen("--structure="))
                 || 0 == strncmp(arg, "--types=", strlen("--types="))))
            {
                external_bles_arguments.back().emplace_back(arg)
            
            /// Options ith value after hitespace.
            else if (in_external_group
                && (0 == strcmp(arg, "--file")
                 || 0 == strcmp(arg, "--name")
                 || 0 == strcmp(arg, "--format")
                 || 0 == strcmp(arg, "--structure")