ClickHouse/src/Functions/FunctionCustomWeekToSomething.h

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#pragma once
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypeDateTime64.h>
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#include <Functions/CustomWeekTransforms.h>
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#include <Functions/IFunction.h>
Extended range of DateTime64 to years 1925 - 2238 The Year 1925 is a starting point because most of the timezones switched to saner (mostly 15-minutes based) offsets somewhere during 1924 or before. And that significantly simplifies implementation. 2238 is to simplify arithmetics for sanitizing LUT index access; there are less than 0x1ffff days from 1925. * Extended DateLUTImpl internal LUT to 0x1ffff items, some of which represent negative (pre-1970) time values. As a collateral benefit, Date now correctly supports dates up to 2149 (instead of 2106). * Added a new strong typedef ExtendedDayNum, which represents dates pre-1970 and post 2149. * Functions that used to return DayNum now return ExtendedDayNum. * Refactored DateLUTImpl to untie DayNum from the dual role of being a value and an index (due to negative time). Index is now a different type LUTIndex with explicit conversion functions from DatNum, time_t, and ExtendedDayNum. * Updated DateLUTImpl to properly support values close to epoch start (1970-01-01 00:00), including negative ones. * Reduced resolution of DateLUTImpl::Values::time_at_offset_change to multiple of 15-minutes to allow storing 64-bits of time_t in DateLUTImpl::Value while keeping same size. * Minor performance updates to DateLUTImpl when building month LUT by skipping non-start-of-month days. * Fixed extractTimeZoneFromFunctionArguments to work correctly with DateTime64. * New unit-tests and stateless integration tests for both DateTime and DateTime64.
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#include <Functions/TransformDateTime64.h>
#include <IO/WriteHelpers.h>
namespace DB
{
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namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
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/// See CustomWeekTransforms.h
template <typename ToDataType, typename Transform>
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class FunctionCustomWeekToSomething : public IFunction
{
public:
static constexpr auto name = Transform::name;
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionCustomWeekToSomething>(); }
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String getName() const override { return name; }
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
if (arguments.size() == 1)
{
if (!isDate(arguments[0].type) && !isDateTime(arguments[0].type) && !isDateTime64(arguments[0].type))
throw Exception(
"Illegal type " + arguments[0].type->getName() + " of argument of function " + getName()
+ ". Should be a date or a date with time",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
else if (arguments.size() == 2)
{
if (!isDate(arguments[0].type) && !isDateTime(arguments[0].type) && !isDateTime64(arguments[0].type))
throw Exception(
"Illegal type " + arguments[0].type->getName() + " of argument of function " + getName()
+ ". Should be a date or a date with time",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (!isUInt8(arguments[1].type))
throw Exception(
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"Function " + getName()
+ " supports 1 or 2 or 3 arguments. The 1st argument "
"must be of type Date or DateTime. The 2nd argument (optional) must be "
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"a constant UInt8 with week mode. The 3rd argument (optional) must be "
"a constant string with timezone name",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
else if (arguments.size() == 3)
{
if (!isDate(arguments[0].type) && !isDateTime(arguments[0].type) && !isDateTime64(arguments[0].type))
throw Exception(
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"Illegal type " + arguments[0].type->getName() + " of argument of function " + getName()
+ ". Should be a date or a date with time",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (!isUInt8(arguments[1].type))
throw Exception(
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"Function " + getName()
+ " supports 1 or 2 or 3 arguments. The 1st argument "
"must be of type Date or DateTime. The 2nd argument (optional) must be "
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"a constant UInt8 with week mode. The 3rd argument (optional) must be "
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"a constant string with timezone name",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
if (!isString(arguments[2].type))
throw Exception(
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"Function " + getName()
+ " supports 1 or 2 or 3 arguments. The 1st argument "
"must be of type Date or DateTime. The 2nd argument (optional) must be "
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"a constant UInt8 with week mode. The 3rd argument (optional) must be "
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"a constant string with timezone name",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
if (isDate(arguments[0].type) && std::is_same_v<ToDataType, DataTypeDate>)
throw Exception(
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"The timezone argument of function " + getName() + " is allowed only when the 1st argument has the type DateTime",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
else
throw Exception(
"Number of arguments for function " + getName() + " doesn't match: passed " + toString(arguments.size())
+ ", should be 1 or 2 or 3",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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return std::make_shared<ToDataType>();
}
bool useDefaultImplementationForConstants() const override { return true; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1, 2}; }
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
{
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const IDataType * from_type = arguments[0].type.get();
WhichDataType which(from_type);
if (which.isDate())
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return CustomWeekTransformImpl<DataTypeDate, ToDataType>::execute(
arguments, result_type, input_rows_count, Transform{});
else if (which.isDateTime())
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return CustomWeekTransformImpl<DataTypeDateTime, ToDataType>::execute(
arguments, result_type, input_rows_count, Transform{});
else if (which.isDateTime64())
{
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return CustomWeekTransformImpl<DataTypeDateTime64, ToDataType>::execute(
arguments, result_type, input_rows_count,
TransformDateTime64<Transform>{assert_cast<const DataTypeDateTime64 *>(from_type)->getScale()});
}
else
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throw Exception(
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"Illegal type " + arguments[0].type->getName() + " of argument of function " + getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
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bool hasInformationAboutMonotonicity() const override { return true; }
Monotonicity getMonotonicityForRange(const IDataType & type, const Field & left, const Field & right) const override
{
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IFunction::Monotonicity is_monotonic{true};
IFunction::Monotonicity is_not_monotonic;
if (std::is_same_v<typename Transform::FactorTransform, ZeroTransform>)
{
is_monotonic.is_always_monotonic = true;
return is_monotonic;
}
/// This method is called only if the function has one argument. Therefore, we do not care about the non-local time zone.
const DateLUTImpl & date_lut = DateLUT::instance();
if (left.isNull() || right.isNull())
return is_not_monotonic;
/// The function is monotonous on the [left, right] segment, if the factor transformation returns the same values for them.
if (checkAndGetDataType<DataTypeDate>(&type))
{
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return Transform::FactorTransform::execute(UInt16(left.get<UInt64>()), date_lut)
== Transform::FactorTransform::execute(UInt16(right.get<UInt64>()), date_lut)
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? is_monotonic
: is_not_monotonic;
}
else
{
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return Transform::FactorTransform::execute(UInt32(left.get<UInt64>()), date_lut)
== Transform::FactorTransform::execute(UInt32(right.get<UInt64>()), date_lut)
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? is_monotonic
: is_not_monotonic;
}
}
};
}