```
$ 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.
else
            {
                
                components.fractional *= 10;
            }
        }
        
        while (!buf.eof() && isNumericASCII(*buf.position()))
            ++buf.position();
    }
    
    else if (whole >= 9908870400LL)
    {
        
        
        for (size_t i = 0; i < scale; ++i)
        {
            components.fractional *= 10;
            components.fractional += components.whole % 10;
            components.whole /= 10;
        }
    }
    datetime64 = DecimalUtils::decimalFromComponents<DateTime64>(components, scale);
    return ReturnType(true);
}
inline void readDateTimeText(time_t & datetime, ReadBuffer & buf, const DateLUTImpl & time_zone = DateLUT::instance())
{
    readDateTimeTextImpl<void>(datetime, buf, time_zone);
}
inline void readDateTime64Text(DateTime64 & datetime64, UInt32 scale, ReadBuffer & buf, const DateLUTImpl & date_lut = DateLUT::instance())