```
$ echo '20210101,A' | clickhouse-local --input-format CSV --structure 'd Date, s String' --query "SELECT * FROM table"
Code: 27. DB::Exception: Cannot parse input: expected ',' before: '20210101,A\n': 
Row 1:
Column 0,   name: d, type: Date,   ERROR: text "20210101,A" is not like Date

: While executing ParallelParsingBlockInputFormat: While executing File. (CANNOT_PARSE_INPUT_ASSERTION_FAILED)
```

**How to solve**

Disambiguate while parsing by absense of separators between YYYY-MM-DD.
case 'M':
            finish(1000000, 20);
            break;
        case 'G':
            finish(1000000000, 30);
            break;
        case 'T':
            finish(1000000000000ULL, 40);
            break;
        default:
            return;
    }
    return;
}
template <typename T>
inline T parseWithSizeSuffix(const char * data, size_t size)
{
    T res;
    ReadBufferFromMemory buf(data, size);
    readTextWithSizeSuffix(res, buf);
    assertEOF(buf);
    return res;
}
template <typename T>
inline T parseWithSizeSuffix(const std::string_view & s)
{
    return parseWithSizeSuffix<T>(s.data(), s.size());
}
template <typename T>
inline T parseWithSizeSuffix(const char * data)