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4abc36774e
In cases where the implementation simply repeates the implementation inherited from the base class, it can be omitted.
74 lines
1.5 KiB
C++
74 lines
1.5 KiB
C++
#include <Functions/IFunction.h>
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#include <Functions/FunctionFactory.h>
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#include <Columns/ColumnsNumber.h>
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#include <DataTypes/DataTypesNumber.h>
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namespace DB
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{
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namespace
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{
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class FunctionRowNumberInBlock : public IFunction
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{
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public:
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static constexpr auto name = "rowNumberInBlock";
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static FunctionPtr create(ContextPtr)
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{
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return std::make_shared<FunctionRowNumberInBlock>();
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}
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/// Get the name of the function.
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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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bool isStateful() const override
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{
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return true;
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}
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size_t getNumberOfArguments() const override
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{
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return 0;
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}
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bool isDeterministic() const override
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{
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return false;
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}
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bool isDeterministicInScopeOfQuery() const override
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{
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return false;
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}
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
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{
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return std::make_shared<DataTypeUInt64>();
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
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{
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auto column = ColumnUInt64::create();
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auto & data = column->getData();
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data.resize(input_rows_count);
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for (size_t i = 0; i < input_rows_count; ++i)
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data[i] = i;
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return column;
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}
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};
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}
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REGISTER_FUNCTION(RowNumberInBlock)
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{
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factory.registerFunction<FunctionRowNumberInBlock>();
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}
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}
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