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#include <Columns/ColumnNullable.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnVector.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/IDataType.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypeNullable.h>
#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <Functions/GregorianDate.h>
#include <IO/ReadBufferFromMemory.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
template <typename Name, typename ToDataType, bool nullOnErrors>
class ExecutableFunctionToModifiedJulianDay : public IExecutableFunction
{
public:
String getName() const override
{
return Name::name;
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
const IColumn * col_from = arguments[0].column.get();
const ColumnString * col_from_string = checkAndGetColumn<ColumnString>(col_from);
const ColumnFixedString * col_from_fixed_string = checkAndGetColumn<ColumnFixedString>(col_from);
const ColumnString::Chars * chars = nullptr;
const IColumn::Offsets * offsets = nullptr;
size_t fixed_string_size = 0;
if (col_from_string)
{
chars = &col_from_string->getChars();
offsets = &col_from_string->getOffsets();
}
else if (col_from_fixed_string)
{
chars = &col_from_fixed_string->getChars();
fixed_string_size = col_from_fixed_string->getN();
}
else
{
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of first argument of function {}",
col_from->getName(), Name::name);
}
using ColVecTo = typename ToDataType::ColumnType;
typename ColVecTo::MutablePtr col_to = ColVecTo::create(input_rows_count);
typename ColVecTo::Container & vec_to = col_to->getData();
ColumnUInt8::MutablePtr col_null_map_to;
UInt8 * 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().data();
}
size_t current_offset = 0;
for (size_t i = 0; i < input_rows_count; ++i)
{
const size_t next_offset = offsets ? (*offsets)[i] : current_offset + fixed_string_size;
const size_t string_size = offsets ? next_offset - current_offset - 1 : fixed_string_size;
ReadBufferFromMemory read_buffer(&(*chars)[current_offset], string_size);
current_offset = next_offset;
if constexpr (nullOnErrors)
{
GregorianDate date;
int64_t res = 0;
bool success = date.tryInit(read_buffer) && date.tryToModifiedJulianDay(res);
vec_to[i] = static_cast<typename ToDataType::FieldType>(res);
vec_null_map_to[i] = !success;
}
else
{
const GregorianDate date(read_buffer);
vec_to[i] = static_cast<typename ToDataType::FieldType>(date.toModifiedJulianDay());
}
}
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 ToDataType, bool nullOnErrors>
class FunctionBaseToModifiedJulianDay : public IFunctionBase
{
public:
explicit FunctionBaseToModifiedJulianDay(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;
}
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
ExecutableFunctionPtr prepare(const ColumnsWithTypeAndName &) const override
{
return std::make_unique<ExecutableFunctionToModifiedJulianDay<Name, ToDataType, nullOnErrors>>();
}
bool isInjective(const ColumnsWithTypeAndName &) 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, typename ToDataType, bool nullOnErrors>
class ToModifiedJulianDayOverloadResolver : public IFunctionOverloadResolver
{
public:
static constexpr auto name = Name::name;
static FunctionOverloadResolverPtr create(ContextPtr)
{
return std::make_unique<ToModifiedJulianDayOverloadResolver<Name, ToDataType, 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 };
return std::make_unique<FunctionBaseToModifiedJulianDay<Name, ToDataType, nullOnErrors>>(argument_types, return_type);
}
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (!isStringOrFixedString(arguments[0]))
{
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The argument of function {} must be String or FixedString",
getName());
}
DataTypePtr base_type = std::make_shared<ToDataType>();
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 NameToModifiedJulianDay
{
static constexpr auto name = "toModifiedJulianDay";
};
struct NameToModifiedJulianDayOrNull
{
static constexpr auto name = "toModifiedJulianDayOrNull";
};
REGISTER_FUNCTION(ToModifiedJulianDay)
{
factory.registerFunction<ToModifiedJulianDayOverloadResolver<NameToModifiedJulianDay, DataTypeInt32, false>>();
factory.registerFunction<ToModifiedJulianDayOverloadResolver<NameToModifiedJulianDayOrNull, DataTypeInt32, true>>();
}
}
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