1#include <Functions/IFunctionImpl.h>
2#include <Functions/FunctionFactory.h>
3#include <Functions/GatherUtils/GatherUtils.h>
4#include <DataTypes/DataTypeArray.h>
5#include <DataTypes/DataTypeNullable.h>
6#include <DataTypes/getLeastSupertype.h>
7#include <Columns/ColumnArray.h>
8#include <Columns/ColumnConst.h>
9#include <Interpreters/castColumn.h>
10#include <IO/WriteHelpers.h>
11#include <Common/typeid_cast.h>
12
13
14namespace DB
15{
16
17namespace ErrorCodes
18{
19 extern const int LOGICAL_ERROR;
20 extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
21 extern const int ILLEGAL_COLUMN;
22 extern const int ILLEGAL_TYPE_OF_ARGUMENT;
23}
24
25class FunctionArrayResize : public IFunction
26{
27public:
28 static constexpr auto name = "arrayResize";
29 static FunctionPtr create(const Context & context) { return std::make_shared<FunctionArrayResize>(context); }
30 FunctionArrayResize(const Context & context_) : context(context_) {}
31
32 String getName() const override { return name; }
33
34 bool isVariadic() const override { return true; }
35 size_t getNumberOfArguments() const override { return 0; }
36
37 DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
38 {
39 const size_t number_of_arguments = arguments.size();
40
41 if (number_of_arguments < 2 || number_of_arguments > 3)
42 throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
43 + toString(number_of_arguments) + ", should be 2 or 3",
44 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
45
46 if (arguments[0]->onlyNull())
47 return arguments[0];
48
49 auto array_type = typeid_cast<const DataTypeArray *>(arguments[0].get());
50 if (!array_type)
51 throw Exception("First argument for function " + getName() + " must be an array but it has type "
52 + arguments[0]->getName() + ".", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
53
54 if (WhichDataType(array_type->getNestedType()).isNothing())
55 throw Exception("Function " + getName() + " cannot resize " + array_type->getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
56
57 if (!isInteger(removeNullable(arguments[1])) && !arguments[1]->onlyNull())
58 throw Exception(
59 "Argument " + toString(1) + " for function " + getName() + " must be integer but it has type "
60 + arguments[1]->getName() + ".", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
61
62 if (number_of_arguments == 2)
63 return arguments[0];
64 else /* if (number_of_arguments == 3) */
65 return std::make_shared<DataTypeArray>(getLeastSupertype({array_type->getNestedType(), arguments[2]}));
66 }
67
68 void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override
69 {
70 const auto & return_type = block.getByPosition(result).type;
71
72 if (return_type->onlyNull())
73 {
74 block.getByPosition(result).column = return_type->createColumnConstWithDefaultValue(input_rows_count);
75 return;
76 }
77
78 auto result_column = return_type->createColumn();
79
80 auto array_column = block.getByPosition(arguments[0]).column;
81 auto size_column = block.getByPosition(arguments[1]).column;
82
83 if (!block.getByPosition(arguments[0]).type->equals(*return_type))
84 array_column = castColumn(block.getByPosition(arguments[0]), return_type, context);
85
86 const DataTypePtr & return_nested_type = typeid_cast<const DataTypeArray &>(*return_type).getNestedType();
87 size_t size = array_column->size();
88
89 ColumnPtr appended_column;
90 if (arguments.size() == 3)
91 {
92 appended_column = block.getByPosition(arguments[2]).column;
93 if (!block.getByPosition(arguments[2]).type->equals(*return_nested_type))
94 appended_column = castColumn(block.getByPosition(arguments[2]), return_nested_type, context);
95 }
96 else
97 appended_column = return_nested_type->createColumnConstWithDefaultValue(size);
98
99 std::unique_ptr<GatherUtils::IArraySource> array_source;
100 std::unique_ptr<GatherUtils::IValueSource> value_source;
101
102 bool is_const = false;
103
104 if (auto const_array_column = typeid_cast<const ColumnConst *>(array_column.get()))
105 {
106 is_const = true;
107 array_column = const_array_column->getDataColumnPtr();
108 }
109
110 if (auto argument_column_array = typeid_cast<const ColumnArray *>(array_column.get()))
111 array_source = GatherUtils::createArraySource(*argument_column_array, is_const, size);
112 else
113 throw Exception{"First arguments for function " + getName() + " must be array.", ErrorCodes::LOGICAL_ERROR};
114
115
116 bool is_appended_const = false;
117 if (auto const_appended_column = typeid_cast<const ColumnConst *>(appended_column.get()))
118 {
119 is_appended_const = true;
120 appended_column = const_appended_column->getDataColumnPtr();
121 }
122
123 value_source = GatherUtils::createValueSource(*appended_column, is_appended_const, size);
124
125 auto sink = GatherUtils::createArraySink(typeid_cast<ColumnArray &>(*result_column), size);
126
127 if (isColumnConst(*size_column))
128 GatherUtils::resizeConstantSize(*array_source, *value_source, *sink, size_column->getInt(0));
129 else
130 GatherUtils::resizeDynamicSize(*array_source, *value_source, *sink, *size_column);
131
132 block.getByPosition(result).column = std::move(result_column);
133 }
134
135 bool useDefaultImplementationForConstants() const override { return true; }
136 bool useDefaultImplementationForNulls() const override { return false; }
137
138private:
139 const Context & context;
140};
141
142
143void registerFunctionArrayResize(FunctionFactory & factory)
144{
145 factory.registerFunction<FunctionArrayResize>();
146}
147
148}
149