1 | #include <Functions/IFunctionImpl.h> |
---|---|
2 | #include <Functions/FunctionFactory.h> |
3 | #include <DataTypes/DataTypeArray.h> |
4 | #include <DataTypes/DataTypesNumber.h> |
5 | #include <DataTypes/DataTypeDate.h> |
6 | #include <DataTypes/DataTypeDateTime.h> |
7 | #include <DataTypes/DataTypeDateTime64.h> |
8 | #include <DataTypes/DataTypeString.h> |
9 | #include <Columns/ColumnArray.h> |
10 | #include <Columns/ColumnString.h> |
11 | #include <Columns/ColumnsNumber.h> |
12 | |
13 | |
14 | namespace DB |
15 | { |
16 | |
17 | /// TODO Make it simple. |
18 | |
19 | template <typename Type> struct TypeToColumnType { using ColumnType = ColumnVector<Type>; }; |
20 | template <> struct TypeToColumnType<String> { using ColumnType = ColumnString; }; |
21 | |
22 | template <typename DataType> struct DataTypeToName : TypeName<typename DataType::FieldType> { }; |
23 | template <> struct DataTypeToName<DataTypeDate> { static std::string get() { return "Date"; } }; |
24 | template <> struct DataTypeToName<DataTypeDateTime> { static std::string get() { return "DateTime"; } }; |
25 | |
26 | |
27 | template <typename DataType> |
28 | struct FunctionEmptyArray : public IFunction |
29 | { |
30 | static constexpr auto base_name = "emptyArray"; |
31 | static const String name; |
32 | static FunctionPtr create(const Context &) { return std::make_shared<FunctionEmptyArray>(); } |
33 | |
34 | private: |
35 | String getName() const override |
36 | { |
37 | return name; |
38 | } |
39 | |
40 | size_t getNumberOfArguments() const override { return 0; } |
41 | |
42 | DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override |
43 | { |
44 | return std::make_shared<DataTypeArray>(std::make_shared<DataType>()); |
45 | } |
46 | |
47 | void executeImpl(Block & block, const ColumnNumbers &, size_t result, size_t input_rows_count) override |
48 | { |
49 | using UnderlyingColumnType = typename TypeToColumnType<typename DataType::FieldType>::ColumnType; |
50 | |
51 | block.getByPosition(result).column = ColumnArray::create( |
52 | UnderlyingColumnType::create(), |
53 | ColumnArray::ColumnOffsets::create(input_rows_count, 0)); |
54 | } |
55 | }; |
56 | |
57 | |
58 | template <typename DataType> |
59 | const String FunctionEmptyArray<DataType>::name = FunctionEmptyArray::base_name + String(DataTypeToName<DataType>::get()); |
60 | |
61 | using FunctionEmptyArrayUInt8 = FunctionEmptyArray<DataTypeUInt8>; |
62 | using FunctionEmptyArrayUInt16 = FunctionEmptyArray<DataTypeUInt16>; |
63 | using FunctionEmptyArrayUInt32 = FunctionEmptyArray<DataTypeUInt32>; |
64 | using FunctionEmptyArrayUInt64 = FunctionEmptyArray<DataTypeUInt64>; |
65 | using FunctionEmptyArrayInt8 = FunctionEmptyArray<DataTypeInt8>; |
66 | using FunctionEmptyArrayInt16 = FunctionEmptyArray<DataTypeInt16>; |
67 | using FunctionEmptyArrayInt32 = FunctionEmptyArray<DataTypeInt32>; |
68 | using FunctionEmptyArrayInt64 = FunctionEmptyArray<DataTypeInt64>; |
69 | using FunctionEmptyArrayFloat32 = FunctionEmptyArray<DataTypeFloat32>; |
70 | using FunctionEmptyArrayFloat64 = FunctionEmptyArray<DataTypeFloat64>; |
71 | using FunctionEmptyArrayDate = FunctionEmptyArray<DataTypeDate>; |
72 | using FunctionEmptyArrayDateTime = FunctionEmptyArray<DataTypeDateTime>; |
73 | using FunctionEmptyArrayString = FunctionEmptyArray<DataTypeString>; |
74 | |
75 | |
76 | void registerFunctionsEmptyArray(FunctionFactory & factory) |
77 | { |
78 | factory.registerFunction<FunctionEmptyArrayUInt8>(); |
79 | factory.registerFunction<FunctionEmptyArrayUInt16>(); |
80 | factory.registerFunction<FunctionEmptyArrayUInt32>(); |
81 | factory.registerFunction<FunctionEmptyArrayUInt64>(); |
82 | factory.registerFunction<FunctionEmptyArrayInt8>(); |
83 | factory.registerFunction<FunctionEmptyArrayInt16>(); |
84 | factory.registerFunction<FunctionEmptyArrayInt32>(); |
85 | factory.registerFunction<FunctionEmptyArrayInt64>(); |
86 | factory.registerFunction<FunctionEmptyArrayFloat32>(); |
87 | factory.registerFunction<FunctionEmptyArrayFloat64>(); |
88 | factory.registerFunction<FunctionEmptyArrayDate>(); |
89 | factory.registerFunction<FunctionEmptyArrayDateTime>(); |
90 | factory.registerFunction<FunctionEmptyArrayString>(); |
91 | } |
92 | |
93 | } |
94 |