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#pragma once
#include <Common/DateLUT.h>
#include <DataTypes/DataTypeInterval.h>
#include <Functions/IFunction.h>
namespace DB
{
/** Time window functions:
*
* tumble(time_attr, interval [, timezone])
*
* tumbleStart(window_id)
*
* tumbleStart(time_attr, interval [, timezone])
*
* tumbleEnd(window_id)
*
* tumbleEnd(time_attr, interval [, timezone])
*
* hop(time_attr, hop_interval, window_interval [, timezone])
*
* hopStart(window_id)
*
* hopStart(time_attr, hop_interval, window_interval [, timezone])
*
* hopEnd(window_id)
*
* hopEnd(time_attr, hop_interval, window_interval [, timezone])
*
*/
enum TimeWindowFunctionName
{
TUMBLE,
TUMBLE_START,
TUMBLE_END,
HOP,
HOP_START,
HOP_END,
WINDOW_ID
};
template <IntervalKind::Kind unit>
struct ToStartOfTransform;
#define TRANSFORM_DATE(INTERVAL_KIND) \
template <> \
struct ToStartOfTransform<IntervalKind::INTERVAL_KIND> \
{ \
static auto execute(UInt32 t, UInt64 delta, const DateLUTImpl & time_zone) \
{ \
return time_zone.toStartOf##INTERVAL_KIND##Interval(time_zone.toDayNum(t), delta); \
} \
};
TRANSFORM_DATE(Year)
TRANSFORM_DATE(Quarter)
TRANSFORM_DATE(Month)
TRANSFORM_DATE(Week)
#undef TRANSFORM_DATE
template <>
struct ToStartOfTransform<IntervalKind::Day>
{
static UInt32 execute(UInt32 t, UInt64 delta, const DateLUTImpl & time_zone)
{
return static_cast<UInt32>(time_zone.toStartOfDayInterval(time_zone.toDayNum(t), delta));
}
};
#define TRANSFORM_TIME(INTERVAL_KIND) \
template <> \
struct ToStartOfTransform<IntervalKind::INTERVAL_KIND> \
{ \
static UInt32 execute(UInt32 t, UInt64 delta, const DateLUTImpl & time_zone) \
{ \
return static_cast<UInt32>(time_zone.toStartOf##INTERVAL_KIND##Interval(t, delta)); \
} \
};
TRANSFORM_TIME(Hour)
TRANSFORM_TIME(Minute)
TRANSFORM_TIME(Second)
#undef TRANSFORM_TIME
#define TRANSFORM_SUBSECONDS(INTERVAL_KIND, DEF_SCALE) \
template<> \
struct ToStartOfTransform<IntervalKind::INTERVAL_KIND> \
{ \
static Int64 execute(Int64 t, UInt64 delta, const UInt32 scale) \
{ \
if (scale <= DEF_SCALE) \
{ \
auto val = t * DecimalUtils::scaleMultiplier<DateTime64>(DEF_SCALE - scale); \
if (delta == 1) \
return val; \
else \
return val - (val % delta); \
} \
else \
{ \
return t - (t % (delta * DecimalUtils::scaleMultiplier<DateTime64>(scale - DEF_SCALE))) ; \
} \
} \
};
TRANSFORM_SUBSECONDS(Millisecond, 3)
TRANSFORM_SUBSECONDS(Microsecond, 6)
TRANSFORM_SUBSECONDS(Nanosecond, 9)
#undef TRANSFORM_SUBSECONDS
template <IntervalKind::Kind unit>
struct AddTime;
#define ADD_DATE(INTERVAL_KIND) \
template <> \
struct AddTime<IntervalKind::INTERVAL_KIND> \
{ \
static inline auto execute(UInt16 d, Int64 delta, const DateLUTImpl & time_zone) \
{ \
return time_zone.add##INTERVAL_KIND##s(ExtendedDayNum(d), delta); \
} \
};
ADD_DATE(Year)
ADD_DATE(Quarter)
ADD_DATE(Month)
#undef ADD_DATE
template <>
struct AddTime<IntervalKind::Week>
{
static inline NO_SANITIZE_UNDEFINED ExtendedDayNum execute(UInt16 d, UInt64 delta, const DateLUTImpl &)
{
return ExtendedDayNum(static_cast<Int32>(d + delta * 7));
}
};
#define ADD_TIME(INTERVAL_KIND, INTERVAL) \
template <> \
struct AddTime<IntervalKind::INTERVAL_KIND> \
{ \
static inline NO_SANITIZE_UNDEFINED UInt32 execute(UInt32 t, Int64 delta, const DateLUTImpl &) \
{ return static_cast<UInt32>(t + delta * INTERVAL); } \
};
ADD_TIME(Day, 86400)
ADD_TIME(Hour, 3600)
ADD_TIME(Minute, 60)
ADD_TIME(Second, 1)
#undef ADD_TIME
#define ADD_SUBSECONDS(INTERVAL_KIND, DEF_SCALE) \
template <> \
struct AddTime<IntervalKind::INTERVAL_KIND> \
{ \
static inline NO_SANITIZE_UNDEFINED Int64 execute(Int64 t, UInt64 delta, const UInt32 scale) \
{ \
if (scale < DEF_SCALE) \
{ \
return t + delta * DecimalUtils::scaleMultiplier<DateTime64>(DEF_SCALE - scale); \
} \
else \
return t + delta * DecimalUtils::scaleMultiplier<DateTime64>(scale - DEF_SCALE); \
} \
};
ADD_SUBSECONDS(Millisecond, 3)
ADD_SUBSECONDS(Microsecond, 6)
ADD_SUBSECONDS(Nanosecond, 9)
#undef ADD_SUBSECONDS
template <TimeWindowFunctionName type>
struct TimeWindowImpl
{
static constexpr auto name = "UNKNOWN";
static DataTypePtr getReturnType(const ColumnsWithTypeAndName & arguments, const String & function_name);
static ColumnPtr dispatchForColumns(const ColumnsWithTypeAndName & arguments, const String & function_name);
};
template <TimeWindowFunctionName type>
class FunctionTimeWindow : public IFunction
{
public:
static constexpr auto name = TimeWindowImpl<type>::name;
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionTimeWindow>(); }
String getName() const override { return name; }
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool useDefaultImplementationForConstants() const override { return true; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1, 2, 3}; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo &) const override { return true; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override;
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & /*result_type*/, size_t /*input_rows_count*/) const override;
};
using FunctionTumble = FunctionTimeWindow<TUMBLE>;
using FunctionTumbleStart = FunctionTimeWindow<TUMBLE_START>;
using FunctionTumbleEnd = FunctionTimeWindow<TUMBLE_END>;
using FunctionHop = FunctionTimeWindow<HOP>;
using FunctionWindowId = FunctionTimeWindow<WINDOW_ID>;
using FunctionHopStart = FunctionTimeWindow<HOP_START>;
using FunctionHopEnd = FunctionTimeWindow<HOP_END>;
}
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