```
$ 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.
}
        ++buf.position();
    }
end:
    if (has_sign && !has_number)
    {
        if constexpr (throw_exception)
            throw ParsingException(
                "Cannot parse number with a sign character but without any numeric character", ErrorCodes::CANNOT_PARSE_NUMBER);
        else
            return ReturnType(false);
    }
    x = res;
    if constexpr (is_signed_v<T>)
    {
        if (negative)
        {
            if constexpr (check_overflow == ReadIntTextCheckOverflow::CHECK_OVERFLOW)
            {
                if (common::mulOverflow<UnsignedT, Int8, T>(res, -1, x))
                    return ReturnType(false);
            }
            else
                x = -res;
        }
    }
    return ReturnType(true);
}
template <ReadIntTextCheckOverflow check_overflow = ReadIntTextCheckOverflow::DO_NOT_CHECK_OVERFLOW, typename T>
void readIntText(T & x, ReadBuffer & buf)