```
$ 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();
        }
        else
            break;
    }
    
    x = is_signed_v<T> && negative ? -res : res;
}
template <typename T>
void tryReadIntTextUnsafe(T & x, ReadBuffer & buf)
{
    return readIntTextUnsafe<T, false>(x, buf);
}
template <typename T> void readFloatText(T & x, ReadBuffer & in);
template <typename T> bool tryReadFloatText(T & x, ReadBuffer & in);
void readString(String & s, ReadBuffer & buf);
void readEscapedString(String & s, ReadBuffer & buf);
void readQuotedString(String & s, ReadBuffer & buf);
void readQuotedStringWithSQLStyle(String & s, ReadBuffer & buf);
void readDoubleQuotedString(String & s, ReadBuffer & buf);
void readDoubleQuotedStringWithSQLStyle(String & s, ReadBuffer & buf);
void readJSONString(String & s, ReadBuffer & buf);
void readBackQuotedString(String & s, ReadBuffer & buf);
void readBackQuotedStringWithSQLStyle(String & s, ReadBuffer & buf);
void readStringUntilEOF(String & s, ReadBuffer & buf);
void readEscapedStringUntilEOL(String & s, ReadBuffer & buf);
void readStringUntilWhitespace(String & s, ReadBuffer & buf);
/** Read string in CSV format.
  * Parsing rules:
  * - string could be placed in quotes; quotes could be single: ' if FormatSettings::CSV::allow_single_quotes is true