```
$ 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.
s[size] = 0;
                if constexpr (throw_exception)
                {
                    throw ParsingException(std::string("Cannot parse uuid ") + s, ErrorCodes::CANNOT_PARSE_UUID);
                }
                else
                {
                    return ReturnType(false);
                }
            }
            parseUUID(reinterpret_cast<const UInt8 *>(s), std::reverse_iterator<UInt8 *>(reinterpret_cast<UInt8 *>(&uuid) + 16));
        }
        else
            parseUUIDWithoutSeparator(reinterpret_cast<const UInt8 *>(s), std::reverse_iterator<UInt8 *>(reinterpret_cast<UInt8 *>(&uuid) + 16));
        return ReturnType(true);
    }
    else
    {
        s[size] = 0;
        if constexpr (throw_exception)
        {
            throw ParsingException(std::string("Cannot parse uuid ") + s, ErrorCodes::CANNOT_PARSE_UUID);
        }
        else
        {
            return ReturnType(false);
        }
    }
}
inline void readUUIDText(UUID & uuid, ReadBuffer & buf)