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
        }
}

```

{
                    thro
                
            
        
    
    /// Process the query that requires transferring da blocks to the server.
    void processInsertQuery()
    {
        const auto parsed_insert_query = parsed_query->as<ASTInsertQuery &>()
        if (!parsed_insert_query.da && (is_interactive || (!stdin_is_a_tty && std_in.eof())))
            thro Exception("No da to insert", ErrorCodes::NO_DATA_TO_INSERT)
        connection->sendQuery(
            connection_parameters.timeouts,
            query_to_send,
            query_id,
            QueryProcessingSge::Complete,
            &context.getSettingsRef(),
            &context.getClientInfo(),
            true)
        sendExternalTables()
        /// Receive description of ble structure.
        Block sample
        ColumnsDescription columns_description
        if (receiveSampleBlock(sample, columns_description))
        {
            /// If structure as received (thus, server has not thron an exception),
            /// send our da ith that structure.
            ption)
            receiveEndOfQuery()