1 | #include <Functions/IFunctionImpl.h> |
---|---|
2 | #include <Functions/FunctionFactory.h> |
3 | |
4 | |
5 | namespace DB |
6 | { |
7 | |
8 | /** materialize(x) - materialize the constant |
9 | */ |
10 | class FunctionMaterialize : public IFunction |
11 | { |
12 | public: |
13 | static constexpr auto name = "materialize"; |
14 | static FunctionPtr create(const Context &) |
15 | { |
16 | return std::make_shared<FunctionMaterialize>(); |
17 | } |
18 | |
19 | /// Get the function name. |
20 | String getName() const override |
21 | { |
22 | return name; |
23 | } |
24 | |
25 | size_t getNumberOfArguments() const override |
26 | { |
27 | return 1; |
28 | } |
29 | |
30 | DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override |
31 | { |
32 | return arguments[0]; |
33 | } |
34 | |
35 | void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) override |
36 | { |
37 | block.getByPosition(result).column = block.getByPosition(arguments[0]).column->convertToFullColumnIfConst(); |
38 | } |
39 | }; |
40 | |
41 | |
42 | void registerFunctionMaterialize(FunctionFactory & factory) |
43 | { |
44 | factory.registerFunction<FunctionMaterialize>(); |
45 | } |
46 | |
47 | } |
48 |