1 | #include <Columns/ColumnTuple.h> |
2 | #include <Columns/ColumnArray.h> |
3 | #include <DataTypes/DataTypeTuple.h> |
4 | #include <DataTypes/DataTypeArray.h> |
5 | #include <Functions/FunctionFactory.h> |
6 | #include <Functions/FunctionHelpers.h> |
7 | #include <IO/WriteHelpers.h> |
8 | |
9 | |
10 | namespace DB |
11 | { |
12 | |
13 | namespace ErrorCodes |
14 | { |
15 | extern const int SIZES_OF_ARRAYS_DOESNT_MATCH; |
16 | extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH; |
17 | } |
18 | |
19 | /// arrayZip(['a', 'b', 'c'], ['d', 'e', 'f']) = [('a', 'd'), ('b', 'e'), ('c', 'f')] |
20 | class FunctionArrayZip : public IFunction |
21 | { |
22 | public: |
23 | static constexpr auto name = "arrayZip" ; |
24 | static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayZip>(); } |
25 | |
26 | String getName() const override |
27 | { |
28 | return name; |
29 | } |
30 | |
31 | bool isVariadic() const override { return true; } |
32 | size_t getNumberOfArguments() const override { return 0; } |
33 | bool useDefaultImplementationForConstants() const override { return true; } |
34 | |
35 | DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override |
36 | { |
37 | if (arguments.size() < 1) |
38 | throw Exception("Function " + getName() + " needs at least one argument; passed " + toString(arguments.size()) + "." |
39 | , ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH); |
40 | |
41 | DataTypes arguments_types; |
42 | for (size_t index = 0; index < arguments.size(); ++index) |
43 | { |
44 | const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[index].type.get()); |
45 | |
46 | if (!array_type) |
47 | throw Exception( |
48 | "Argument " + toString(index + 1) + " of function must be array. Found " + arguments[0].type->getName() + " instead." , |
49 | ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT); |
50 | |
51 | arguments_types.emplace_back(array_type->getNestedType()); |
52 | } |
53 | |
54 | return std::make_shared<DataTypeArray>(std::make_shared<DataTypeTuple>(arguments_types)); |
55 | } |
56 | |
57 | void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) override |
58 | { |
59 | auto first_argument = block.getByPosition(arguments[0]); |
60 | const auto & first_array_column = checkAndGetColumn<ColumnArray>(first_argument.column.get()); |
61 | |
62 | Columns res_tuple_columns(arguments.size()); |
63 | res_tuple_columns[0] = first_array_column->getDataPtr(); |
64 | |
65 | for (size_t index = 1; index < arguments.size(); ++index) |
66 | { |
67 | const auto & argument_type_and_column = block.getByPosition(arguments[index]); |
68 | const auto & argument_array_column = checkAndGetColumn<ColumnArray>(argument_type_and_column.column.get()); |
69 | |
70 | if (!first_array_column->hasEqualOffsets(*argument_array_column)) |
71 | throw Exception("The argument 1 and argument " + toString(index + 1) + " of function have different array sizes" , |
72 | ErrorCodes::SIZES_OF_ARRAYS_DOESNT_MATCH); |
73 | |
74 | res_tuple_columns[index] = argument_array_column->getDataPtr(); |
75 | } |
76 | |
77 | block.getByPosition(result).column = ColumnArray::create( |
78 | ColumnTuple::create(res_tuple_columns), first_array_column->getOffsetsPtr()); |
79 | } |
80 | }; |
81 | |
82 | void registerFunctionArrayZip(FunctionFactory & factory) |
83 | { |
84 | factory.registerFunction<FunctionArrayZip>(); |
85 | } |
86 | |
87 | } |
88 | |
89 | |