1 | #include <Common/typeid_cast.h> |
---|---|
2 | #include <DataTypes/DataTypeNothing.h> |
3 | #include <DataTypes/DataTypeFactory.h> |
4 | #include <Columns/ColumnNothing.h> |
5 | #include <IO/ReadBuffer.h> |
6 | #include <IO/WriteBuffer.h> |
7 | |
8 | |
9 | namespace DB |
10 | { |
11 | |
12 | MutableColumnPtr DataTypeNothing::createColumn() const |
13 | { |
14 | return ColumnNothing::create(0); |
15 | } |
16 | |
17 | void DataTypeNothing::serializeBinaryBulk(const IColumn & column, WriteBuffer & ostr, size_t offset, size_t limit) const |
18 | { |
19 | size_t size = column.size(); |
20 | |
21 | if (limit == 0 || offset + limit > size) |
22 | limit = size - offset; |
23 | |
24 | for (size_t i = 0; i < limit; ++i) |
25 | ostr.write('0'); |
26 | } |
27 | |
28 | void DataTypeNothing::deserializeBinaryBulk(IColumn & column, ReadBuffer & istr, size_t limit, double /*avg_value_size_hint*/) const |
29 | { |
30 | typeid_cast<ColumnNothing &>(column).addSize(istr.tryIgnore(limit)); |
31 | } |
32 | |
33 | bool DataTypeNothing::equals(const IDataType & rhs) const |
34 | { |
35 | return typeid(rhs) == typeid(*this); |
36 | } |
37 | |
38 | |
39 | void registerDataTypeNothing(DataTypeFactory & factory) |
40 | { |
41 | const auto & creator = [&](const String & /*type_name*/) { return DataTypePtr(std::make_shared<DataTypeNothing>()); }; |
42 | |
43 | factory.registerSimpleDataType("Nothing", creator); |
44 | } |
45 | |
46 | } |
47 |