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#pragma once
#include <Functions/IFunction.h>
#include <Interpreters/Context.h>
#include <pcg_random.hpp>
namespace DB
{
class FunctionGenerateRandomStructure : public IFunction
{
public:
static constexpr auto name = "generateRandomStructure";
explicit FunctionGenerateRandomStructure(bool allow_suspicious_lc_types_) : allow_suspicious_lc_types(allow_suspicious_lc_types_)
{
}
static FunctionPtr create(ContextPtr context)
{
return std::make_shared<FunctionGenerateRandomStructure>(context->getSettingsRef().allow_suspicious_low_cardinality_types.value);
}
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 0; }
bool isVariadic() const override { return true; }
bool isDeterministic() const override { return false; }
bool isDeterministicInScopeOfQuery() const override { return false; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {0, 1}; }
bool useDefaultImplementationForConstants() const override { return false; }
bool useDefaultImplementationForNulls() const override { return false; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override;
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override;
static String generateRandomStructure(size_t seed, const ContextPtr & context);
private:
bool allow_suspicious_lc_types;
};
}
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