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89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
#include <Functions/IFunction.h>
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#include <Functions/FunctionHelpers.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Columns/ColumnsNumber.h>
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#include <ext/range.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_COLUMN;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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template <typename Impl>
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class FunctionNumericPredicate : public IFunction
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{
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public:
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static constexpr auto name = Impl::name;
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static FunctionPtr create(const Context &)
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{
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return std::make_shared<FunctionNumericPredicate>();
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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 1;
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}
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (!isNumber(arguments.front()))
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throw Exception{"Argument for function " + getName() + " must be number", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
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return std::make_shared<DataTypeUInt8>();
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}
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bool useDefaultImplementationForConstants() const override { return true; }
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) override
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{
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const auto in = block.getByPosition(arguments.front()).column.get();
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if ( !execute<UInt8>(block, in, result)
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&& !execute<UInt16>(block, in, result)
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&& !execute<UInt32>(block, in, result)
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&& !execute<UInt64>(block, in, result)
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&& !execute<Int8>(block, in, result)
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&& !execute<Int16>(block, in, result)
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&& !execute<Int32>(block, in, result)
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&& !execute<Int64>(block, in, result)
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&& !execute<Float32>(block, in, result)
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&& !execute<Float64>(block, in, result))
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throw Exception{"Illegal column " + in->getName() + " of first argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN};
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}
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template <typename T>
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bool execute(Block & block, const IColumn * in_untyped, const size_t result)
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{
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if (const auto in = checkAndGetColumn<ColumnVector<T>>(in_untyped))
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{
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const auto size = in->size();
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auto out = ColumnUInt8::create(size);
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const auto & in_data = in->getData();
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auto & out_data = out->getData();
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for (const auto i : ext::range(0, size))
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out_data[i] = Impl::execute(in_data[i]);
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block.getByPosition(result).column = std::move(out);
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return true;
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}
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return false;
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}
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};
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}
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