**Describe the bug**
ClickHouse doesn't return affected rows via MySQL protocol for INSERT queries after 20.5+

**How to reproduce**
i create clear docker-compose environment for reproduce behavior MySQL + clickhouse + php + python
https://gist.github.com/Slach/aa67440ce856a3a53f64f92eeddfbc1b

**Queries to run that lead to unexpected result**
```
INSERT INTO default.t1(n) SELECT * FROM numbers(1000)
```

**Expected behavior**
MySQL protocol shall return affected rows field for INSERT queries (it works successful in 20.3 and 20.4)
![image](https://user-images.githubusercontent.com/105560/97867431-aa22ae00-1d2f-11eb-8caf-05431ffd29b3.png)

**Actual behavior**
![image](https://user-images.githubusercontent.com/105560/97867401-9f681900-1d2f-11eb-93cc-5ae6f1f5981b.png)
{
    std::ignore = query;
    return "select ''";
}
static String showTableStatusReplacementQuery(const String & query)
{
    const String prefix = "SHOW TABLE STATUS LIKE ";
    if (query.size() > prefix.size())
    {
        String suffix = query.data() + prefix.length();
        return (
            "SELECT"
            " name AS Name,"
            " engine AS Engine,"
            " '10' AS Version,"
            " 'Dynamic' AS Row_format,"
            " 0 AS Rows,"
            " 0 AS Avg_row_length,"
            " 0 AS Data_length,"
            " 0 AS Max_data_length,"
            " 0 AS Index_length,"
            " 0 AS Data_free,"
            " 'NULL' AS Auto_increment,"