ClickHouse/dbms/src/Functions/FunctionsExternalModels.h

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#pragma once
#include <Functions/IFunction.h>
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namespace DB
{
class ExternalModels;
/// Evaluate external model.
/// First argument - model name, the others - model arguments.
/// * for CatBoost model - float features first, then categorical
/// Result - Float64.
class FunctionModelEvaluate final : public IFunction
{
public:
static constexpr auto name = "modelEvaluate";
static FunctionPtr create(const Context & context);
explicit FunctionModelEvaluate(const ExternalModels & models) : models(models) {}
String getName() const override { return name; }
bool isVariadic() const override { return true; }
bool isDeterministic() const override { return false; }
bool useDefaultImplementationForNulls() const override { return false; }
size_t getNumberOfArguments() const override { return 0; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override;
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override;
private:
const ExternalModels & models;
};
}