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 sendDa(Block & sample, const ColumnsDescription & columns_description)
    {
        /// If INSERT da must be sent.
        con parsed_query->as<ASTInsertQuery>()
        if (!parsed_insert_query)
            return
        if (parsed_insert_query->da)
        {
            /// Send da conined in the query.
            rsed_insert_query->da, parsed_insert_query->end - parsed_insert_query->da)
            sendDaFrom(da_in, sample, columns_description)
        
        else if (!is_interactive)
        {
            /// Send da read from stdin.
            slumns_description)
        
        else
            thro Exception("No da to insert", ErrorCodes::NO_DATA_TO_INSERT)
    
    void sendDaFrom(ReadBuffer & buf, Block & sample, const ColumnsDescription & columns_description)
    {
        String current_format = insert_format
        /// Da format n be specified in the INSERT query.
        if (const auto * insert = parsed_query->as<ASTInsertQuery>())
        {
            if (!insert->format.empty())
                current_format = insert->format
        
        BlockInputStreamPtr block_input = context.getInputFormat(