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#include <Columns/ColumnNullable.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnVector.h>
#include <Columns/ColumnsNumber.h>
#include <Core/callOnTypeIndex.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypeNullable.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/IDataType.h>
#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <Functions/GregorianDate.h>
#include <IO/WriteBufferFromVector.h>
#include <IO/WriteHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
template <typename Name, typename FromDataType, bool nullOnErrors>
class ExecutableFunctionFromModifiedJulianDay : public IExecutableFunction
{
public:
String getName() const override
{
return Name::name;
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
using ColVecType = typename FromDataType::ColumnType;
const ColVecType * col_from = checkAndGetColumn<ColVecType>(arguments[0].column.get());
const typename ColVecType::Container & vec_from = col_from->getData();
auto col_to = ColumnString::create();
ColumnString::Chars & data_to = col_to->getChars();
ColumnString::Offsets & offsets_to = col_to->getOffsets();
data_to.resize(input_rows_count * strlen("YYYY-MM-DD") + 1);
offsets_to.resize(input_rows_count);
ColumnUInt8::MutablePtr col_null_map_to;
ColumnUInt8::Container * vec_null_map_to [[maybe_unused]] = nullptr;
if constexpr (nullOnErrors)
{
col_null_map_to = ColumnUInt8::create(input_rows_count);
vec_null_map_to = &col_null_map_to->getData();
}
WriteBufferFromVector<ColumnString::Chars> write_buffer(data_to);
for (size_t i = 0; i < input_rows_count; ++i)
{
if constexpr (nullOnErrors)
{
GregorianDate gd;
(*vec_null_map_to)[i] = !(gd.tryInit(vec_from[i]) && gd.tryWrite(write_buffer));
writeChar(0, write_buffer);
offsets_to[i] = write_buffer.count();
}
else
{
GregorianDate gd(vec_from[i]);
gd.write(write_buffer);
writeChar(0, write_buffer);
offsets_to[i] = write_buffer.count();
}
}
write_buffer.finalize();
if constexpr (nullOnErrors)
return ColumnNullable::create(std::move(col_to), std::move(col_null_map_to));
else
return col_to;
}
bool useDefaultImplementationForConstants() const override
{
return true;
}
};
template <typename Name, typename FromDataType, bool nullOnErrors>
class FunctionBaseFromModifiedJulianDay : public IFunctionBase
{
public:
explicit FunctionBaseFromModifiedJulianDay(DataTypes argument_types_, DataTypePtr return_type_)
: argument_types(std::move(argument_types_))
, return_type(std::move(return_type_)) {}
String getName() const override
{
return Name::name;
}
const DataTypes & getArgumentTypes() const override
{
return argument_types;
}
const DataTypePtr & getResultType() const override
{
return return_type;
}
ExecutableFunctionPtr prepare(const ColumnsWithTypeAndName &) const override
{
return std::make_unique<ExecutableFunctionFromModifiedJulianDay<Name, FromDataType, nullOnErrors>>();
}
bool isInjective(const ColumnsWithTypeAndName &) const override
{
return true;
}
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override
{
return true;
}
bool hasInformationAboutMonotonicity() const override
{
return true;
}
Monotonicity getMonotonicityForRange(const IDataType &, const Field &, const Field &) const override
{
return { .is_monotonic = true, .is_always_monotonic = true, .is_strict = true, };
}
private:
DataTypes argument_types;
DataTypePtr return_type;
};
template <typename Name, bool nullOnErrors>
class FromModifiedJulianDayOverloadResolver : public IFunctionOverloadResolver
{
public:
static constexpr auto name = Name::name;
static FunctionOverloadResolverPtr create(ContextPtr)
{
return std::make_unique<FromModifiedJulianDayOverloadResolver<Name, nullOnErrors>>();
}
String getName() const override
{
return Name::name;
}
FunctionBasePtr buildImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & return_type) const override
{
DataTypes argument_types = { arguments[0].type };
const DataTypePtr & from_type_not_null = removeNullable(arguments[0].type);
FunctionBasePtr base;
auto call = [&](const auto & types) -> bool
{
using Types = std::decay_t<decltype(types)>;
using FromIntType = typename Types::RightType;
using FromDataType = DataTypeNumber<FromIntType>;
base = std::make_unique<FunctionBaseFromModifiedJulianDay<Name, FromDataType, nullOnErrors>>(argument_types, return_type);
return true;
};
bool built = callOnBasicType<void, true, false, false, false>(from_type_not_null->getTypeId(), call);
if (built)
return base;
/* When the argument is a NULL constant, the resulting
* function base will not be actually called but it
* will still be inspected. Returning a NULL pointer
* here causes a SEGV. So we must somehow create a
* dummy implementation and return it.
*/
if (WhichDataType(from_type_not_null).isNothing()) // Nullable(Nothing)
return std::make_unique<FunctionBaseFromModifiedJulianDay<Name, DataTypeInt32, nullOnErrors>>(argument_types, return_type);
else
// Should not happen.
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The argument of function {} must be integral", getName());
}
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (!isInteger(arguments[0]))
{
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The argument of function {} must be integral", getName());
}
DataTypePtr base_type = std::make_shared<DataTypeString>();
if constexpr (nullOnErrors)
return std::make_shared<DataTypeNullable>(base_type);
else
return base_type;
}
size_t getNumberOfArguments() const override
{
return 1;
}
bool isInjective(const ColumnsWithTypeAndName &) const override
{
return true;
}
};
struct NameFromModifiedJulianDay
{
static constexpr auto name = "fromModifiedJulianDay";
};
struct NameFromModifiedJulianDayOrNull
{
static constexpr auto name = "fromModifiedJulianDayOrNull";
};
REGISTER_FUNCTION(FromModifiedJulianDay)
{
factory.registerFunction<FromModifiedJulianDayOverloadResolver<NameFromModifiedJulianDay, false>>();
factory.registerFunction<FromModifiedJulianDayOverloadResolver<NameFromModifiedJulianDayOrNull, true>>();
}
}
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