Always reproduced:

```
milovidov-desktop :) create table table_map (a Map(String, String), b String) engine = MergeTree() order by a;

CREATE TABLE table_map
(
    `a` Map(String, String),
    `b` String
)
ENGINE = MergeTree
ORDER BY a

Query id: 8f8120c1-c165-452a-815f-2bcae3957e2a

Ok.

0 rows in set. Elapsed: 0.002 sec. 

milovidov-desktop :) SELECT b FROM table_map WHERE a = map('name', NULL, '', NULL)

SELECT b
FROM table_map
WHERE a = {'name', NULL, '', NULL}
```
if constexpr (std::is_same_v<Additions, AccurateOrNullConvertStrategyAdditions>)
            {
                col_null_map_to = ColumnUInt8::create(size, false);
                vec_null_map_to = &col_null_map_to->getData();
            }
            for (size_t i = 0; i < size; ++i)
            {
                if constexpr ((is_big_int_v<FromFieldType> || is_big_int_v<ToFieldType>) &&
                    (std::is_same_v<FromFieldType, UInt128> || std::is_same_v<ToFieldType, UInt128>))
                {
                    if constexpr (std::is_same_v<Additions, AccurateOrNullConvertStrategyAdditions>)
                    {
                        vec_to[i] = 0;
                        (*vec_null_map_to)[i] = true;
                    }
                    else
                        throw Exception("Unexpected UInt128 to big int conversion", ErrorCodes::NOT_IMPLEMENTED);
                }
                else if constexpr (std::is_same_v<FromDataType, DataTypeUUID> != std::is_same_v<ToDataType, DataTypeUUID>)
                {
                    throw Exception("Conversion between numeric types and UUID is not supported", ErrorCodes::NOT_IMPLEMENTED);
                }
                else
                {
                    if constexpr (IsDataTypeDecimal<FromDataType> || IsDataTypeDecimal<ToDataType>)
                    {
                        if constexpr (std::is_same_v<Additions, AccurateOrNullConvertStrategyAdditions>)
                        {
                            ToFieldType result;
                            bool convert_result = false;