```
$ 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.clear();
    readQuotedStringInto<true>(s, buf);
}
template void readQuotedStringInto<true>(PaddedPODArray<UInt8> & s, ReadBuffer & buf);
template void readDoubleQuotedStringInto<false>(NullOutput & s, ReadBuffer & buf);
void readDoubleQuotedString(String & s, ReadBuffer & buf)
{
    s.clear();
    readDoubleQuotedStringInto<false>(s, buf);
}
void readDoubleQuotedStringWithSQLStyle(String & s, ReadBuffer & buf)
{
    s.clear();
    readDoubleQuotedStringInto<true>(s, buf);
}
void readBackQuotedString(String & s, ReadBuffer & buf)
{
    s.clear();
    readBackQuotedStringInto<false>(s, buf);
}
void readBackQuotedStringWithSQLStyle(String & s, ReadBuffer & buf)
{
    s.clear();
    readBackQuotedStringInto<true>(s, buf);
}
template <typename Vector>
void readCSVStringInto(Vector & s, ReadBuffer & buf, const FormatSettings::CSV & settings)