1#include <Functions/IFunctionImpl.h>
2#include <Functions/FunctionFactory.h>
3#include <Functions/FunctionHelpers.h>
4#include <DataTypes/DataTypeArray.h>
5#include <Columns/ColumnArray.h>
6
7
8namespace DB
9{
10
11namespace ErrorCodes
12{
13 extern const int ILLEGAL_COLUMN;
14}
15
16/** Creates an array, multiplying the column (the first argument) by the number of elements in the array (the second argument).
17 */
18class FunctionReplicate : public IFunction
19{
20public:
21 static constexpr auto name = "replicate";
22
23 static FunctionPtr create(const Context &)
24 {
25 return std::make_shared<FunctionReplicate>();
26 }
27
28 String getName() const override
29 {
30 return name;
31 }
32
33 size_t getNumberOfArguments() const override
34 {
35 return 2;
36 }
37
38 bool useDefaultImplementationForNulls() const override { return false; }
39
40 DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
41 {
42 const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[1].get());
43 if (!array_type)
44 throw Exception("Second argument for function " + getName() + " must be array.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
45 return std::make_shared<DataTypeArray>(arguments[0]);
46 }
47
48 void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t) override
49 {
50 ColumnPtr first_column = block.getByPosition(arguments[0]).column;
51 const ColumnArray * array_column = checkAndGetColumn<ColumnArray>(block.getByPosition(arguments[1]).column.get());
52 ColumnPtr temp_column;
53 if (!array_column)
54 {
55 auto const_array_column = checkAndGetColumnConst<ColumnArray>(block.getByPosition(arguments[1]).column.get());
56 if (!const_array_column)
57 throw Exception("Unexpected column for replicate", ErrorCodes::ILLEGAL_COLUMN);
58 temp_column = const_array_column->convertToFullColumn();
59 array_column = checkAndGetColumn<ColumnArray>(temp_column.get());
60 }
61 block.getByPosition(result).column
62 = ColumnArray::create(first_column->replicate(array_column->getOffsets())->convertToFullColumnIfConst(), array_column->getOffsetsPtr());
63 }
64};
65
66
67void registerFunctionReplicate(FunctionFactory & factory)
68{
69 factory.registerFunction<FunctionReplicate>();
70}
71
72}
73