**How to reproduce**

```
:) CREATE TABLE `test` (`data` Int64) ENGINE=MergeTree() ORDER BY(`data`);

CREATE TABLE test
(
    `data` Int64
)
ENGINE = MergeTree()
ORDER BY data

Ok.

0 rows in set. Elapsed: 0.007 sec. 
```

```
:) INSERT INTO `test` VALUES(100);

INSERT INTO test VALUES

Ok.

1 rows in set. Elapsed: 0.002 sec. 
```

```
:) SELECT * FROM `test`;

SELECT *
FROM test

┌─data─┐
│  100 │
└──────┘

1 rows in set. Elapsed: 0.002 sec. 
```

```
:) SELECT * FROM `test` FORMAT JSON;

SELECT *
FROM test
FORMAT JSON

{
	"meta":
	[
		{
			"name": "data",
			"type": "Int64"
		}
	],

	"data":
	[
		{
			"data": "100"

	],

	"rows": 1,

	"statistics":
	{
		"elapsed": 0.001765624,
		"rows_read": 1,
		"bytes_read": 8
	}
}

1 rows in set. Elapsed: 0.005 sec. 
```

---

**Which ClickHouse server version to use**

I am using the clickhouse-server docker image. Image ID: `3aa412f816ec`

```
# clickhouse-client
ClickHouse client version 20.6.3.28 (official build).
Connecting to localhost:9000 as user default.
Connected to ClickHouse server version 20.6.3 revision 54436.
```

---

**Expected behavior**

In the `FORMAT JSON` output, I expected the `data` field to be a valid JSON. But it is not. The closing curly bracket for the object is missing.

**Error message and/or stacktrace**

![Screenshot from 2020-08-10 20-18-21](https://user-images.githubusercontent.com/12874561/89796005-b8a16500-db46-11ea-840f-b98b4210d76b.png)

exit(0)
        
        /// Output of help message.
        if (options.count("help")
            || (options.count("host") && options["host"].as<std::string>() == "elp"))    /// If user rites -help instead of --help.
        {
            
            std::cout << external_description << "\n"
            std::cout << "In addition, --param_name=value n be specified for substitution of parameters for parametrized queries.\n"
            exit(0)
        
        if (options.count("log-level"))
            Poco::Logger::root().setLevel(options["log-level"].as<std::string>())
        size_t number_of_external_bles_ith_stdin_source = 0
        for (size_t i = 0 i < external_bles_arguments.size() ++i)
        {
            /// Parse commandline options related to external bles.
            line_parser(external_bles_arguments[i]).options(external_description).run()
            po::variables_map external_options
            po::store(parsed_bles, external_options)
            try
            {
                external_bles.emplace_back(external_options)
                if (external_bles.back().file == "-")
                    ++number_of_external_bles_ith_stdin_source
                if (number_of_external_bles_ith_stdin_source > 1)
                    thro Exception("To or more external bles has stdin (-) set as --file field", ErrorCodes::BAD_ARGUMENTS)
            
            tch (const Exception & e)
            {