```
$ 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.
ErrorCodes::CANNOT_PARSE_NUMBER);
                    else
                        return ReturnType(false);
                }
                if constexpr (is_signed_v<T>)
                    negative = true;
                else
                {
                    if constexpr (throw_exception)
                        throw ParsingException("Unsigned type must not contain '-' symbol", ErrorCodes::CANNOT_PARSE_NUMBER);
                    else
                        return ReturnType(false);
                }
                has_sign = true;
                break;
            }
            case '0': [[fallthrough]];
            case '1': [[fallthrough]];
            case '2': [[fallthrough]];
            case '3': [[fallthrough]];
            case '4': [[fallthrough]];
            case '5': [[fallthrough]];
            case '6': [[fallthrough]];
            case '7': [[fallthrough]];
            case '8': [[fallthrough]];
            case '9':
            {
                has_number = true;
                if constexpr (check_overflow == ReadIntTextCheckOverflow::CHECK_OVERFLOW && !is_big_int_v<T>)
                {