```
$ 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.
#pragma once
#include <cmath>
#include <cstring>
#include <limits>
#include <algorithm>
#include <iterator>
#include <type_traits>
#include <base/DateLUT.h>
#include <base/LocalDate.h>
#include <base/LocalDateTime.h>
#include <base/StringRef.h>
#include <base/arithmeticOverflow.h>
#include <base/unit.h>