```
$ 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.
readCSV(T & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(String & x, ReadBuffer & buf, const FormatSettings::CSV & settings) { readCSVString(x, buf, settings); }
inline void readCSV(LocalDate & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(LocalDateTime & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(UUID & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(UInt128 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(Int128 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(UInt256 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(Int256 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
template <typename T>
void readBinary(std::vector<T> & x, ReadBuffer & buf)
{
    size_t size = 0;
    readVarUInt(size, buf);
    if (size > DEFAULT_MAX_STRING_SIZE)
        throw Poco::Exception("Too large vector size.");
    x.resize(size);
    for (size_t i = 0; i < size; ++i)
        readBinary(x[i], buf);
}
template <typename T>
void readQuoted(std::vector<T> & x, ReadBuffer & buf)