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74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
#include <Functions/IFunctionImpl.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionHelpers.h>
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#include <DataTypes/DataTypeArray.h>
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#include <Columns/ColumnArray.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int ILLEGAL_COLUMN;
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}
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/** Creates an array, multiplying the column (the first argument) by the number of elements in the array (the second argument).
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*/
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class FunctionReplicate : public IFunction
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{
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public:
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static constexpr auto name = "replicate";
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static FunctionPtr create(const Context &)
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{
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return std::make_shared<FunctionReplicate>();
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}
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String getName() const override
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{
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return name;
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}
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size_t getNumberOfArguments() const override
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{
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return 2;
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}
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bool useDefaultImplementationForNulls() const override { return false; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[1].get());
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if (!array_type)
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throw Exception("Second argument for function " + getName() + " must be array.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeArray>(arguments[0]);
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t) const override
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{
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ColumnPtr first_column = block.getByPosition(arguments[0]).column;
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const ColumnArray * array_column = checkAndGetColumn<ColumnArray>(block.getByPosition(arguments[1]).column.get());
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ColumnPtr temp_column;
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if (!array_column)
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{
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const auto * const_array_column = checkAndGetColumnConst<ColumnArray>(block.getByPosition(arguments[1]).column.get());
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if (!const_array_column)
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throw Exception("Unexpected column for replicate", ErrorCodes::ILLEGAL_COLUMN);
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temp_column = const_array_column->convertToFullColumn();
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array_column = checkAndGetColumn<ColumnArray>(temp_column.get());
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}
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block.getByPosition(result).column
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= ColumnArray::create(first_column->replicate(array_column->getOffsets())->convertToFullColumnIfConst(), array_column->getOffsetsPtr());
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}
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};
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void registerFunctionReplicate(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionReplicate>();
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}
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}
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