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datatype_fixedwidth.go
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datatype_fixedwidth.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package arrow
import (
"fmt"
"strconv"
"time"
"github.com/apache/arrow/go/v14/internal/json"
"golang.org/x/xerrors"
)
type BooleanType struct{}
func (t *BooleanType) ID() Type { return BOOL }
func (t *BooleanType) Name() string { return "bool" }
func (t *BooleanType) String() string { return "bool" }
func (t *BooleanType) Fingerprint() string { return typeFingerprint(t) }
func (BooleanType) Bytes() int { return 1 }
// BitWidth returns the number of bits required to store a single element of this data type in memory.
func (t *BooleanType) BitWidth() int { return 1 }
func (BooleanType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecBitmap()}}
}
type FixedSizeBinaryType struct {
ByteWidth int
}
func (*FixedSizeBinaryType) ID() Type { return FIXED_SIZE_BINARY }
func (*FixedSizeBinaryType) Name() string { return "fixed_size_binary" }
func (t *FixedSizeBinaryType) BitWidth() int { return 8 * t.ByteWidth }
func (t *FixedSizeBinaryType) Bytes() int { return t.ByteWidth }
func (t *FixedSizeBinaryType) Fingerprint() string { return typeFingerprint(t) }
func (t *FixedSizeBinaryType) String() string {
return "fixed_size_binary[" + strconv.Itoa(t.ByteWidth) + "]"
}
func (t *FixedSizeBinaryType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(t.ByteWidth)}}
}
type (
Timestamp int64
Time32 int32
Time64 int64
TimeUnit int
Date32 int32
Date64 int64
Duration int64
)
// Date32FromTime returns a Date32 value from a time object
func Date32FromTime(t time.Time) Date32 {
if _, offset := t.Zone(); offset != 0 {
// properly account for timezone adjustments before we calculate
// the number of days by adjusting the time and converting to UTC
t = t.Add(time.Duration(offset) * time.Second).UTC()
}
return Date32(t.Truncate(24*time.Hour).Unix() / int64((time.Hour * 24).Seconds()))
}
func (d Date32) ToTime() time.Time {
return time.Unix(0, 0).UTC().AddDate(0, 0, int(d))
}
func (d Date32) FormattedString() string {
return d.ToTime().Format("2006-01-02")
}
// Date64FromTime returns a Date64 value from a time object
func Date64FromTime(t time.Time) Date64 {
if _, offset := t.Zone(); offset != 0 {
// properly account for timezone adjustments before we calculate
// the actual value by adjusting the time and converting to UTC
t = t.Add(time.Duration(offset) * time.Second).UTC()
}
// truncate to the start of the day to get the correct value
t = t.Truncate(24 * time.Hour)
return Date64(t.Unix()*1e3 + int64(t.Nanosecond())/1e6)
}
func (d Date64) ToTime() time.Time {
days := int(int64(d) / (time.Hour * 24).Milliseconds())
return time.Unix(0, 0).UTC().AddDate(0, 0, days)
}
func (d Date64) FormattedString() string {
return d.ToTime().Format("2006-01-02")
}
// TimestampFromStringInLocation is like TimestampFromString, but treats the time instant
// as if it were in the provided timezone before converting to UTC for internal representation.
func TimestampFromStringInLocation(val string, unit TimeUnit, loc *time.Location) (Timestamp, bool, error) {
if len(val) < 10 {
return 0, false, fmt.Errorf("%w: invalid timestamp string", ErrInvalid)
}
var (
format = "2006-01-02"
zoneFmt string
lenWithoutZone = len(val)
)
if lenWithoutZone > 10 {
switch {
case val[len(val)-1] == 'Z':
zoneFmt = "Z"
lenWithoutZone--
case val[len(val)-3] == '+' || val[len(val)-3] == '-':
zoneFmt = "-07"
lenWithoutZone -= 3
case val[len(val)-5] == '+' || val[len(val)-5] == '-':
zoneFmt = "-0700"
lenWithoutZone -= 5
case val[len(val)-6] == '+' || val[len(val)-6] == '-':
zoneFmt = "-07:00"
lenWithoutZone -= 6
}
}
switch {
case lenWithoutZone == 13:
format += string(val[10]) + "15"
case lenWithoutZone == 16:
format += string(val[10]) + "15:04"
case lenWithoutZone >= 19:
format += string(val[10]) + "15:04:05.999999999"
}
// error if we're truncating precision
// don't need a case for nano as time.Parse will already error if
// more than nanosecond precision is provided
switch {
case unit == Second && lenWithoutZone > 19:
return 0, zoneFmt != "", xerrors.New("provided more than second precision for timestamp[s]")
case unit == Millisecond && lenWithoutZone > 23:
return 0, zoneFmt != "", xerrors.New("provided more than millisecond precision for timestamp[ms]")
case unit == Microsecond && lenWithoutZone > 26:
return 0, zoneFmt != "", xerrors.New("provided more than microsecond precision for timestamp[us]")
}
format += zoneFmt
out, err := time.Parse(format, val)
if err != nil {
return 0, zoneFmt != "", fmt.Errorf("%w: %s", ErrInvalid, err)
}
if loc != time.UTC {
// convert to UTC by putting the same time instant in the desired location
// before converting to UTC
out = out.In(loc).UTC()
}
ts, err := TimestampFromTime(out, unit)
return ts, zoneFmt != "", err
}
// TimestampFromString parses a string and returns a timestamp for the given unit
// level.
//
// The timestamp should be in one of the following forms, [T] can be either T
// or a space, and [.zzzzzzzzz] can be either left out or up to 9 digits of
// fractions of a second.
//
// YYYY-MM-DD
// YYYY-MM-DD[T]HH
// YYYY-MM-DD[T]HH:MM
// YYYY-MM-DD[T]HH:MM:SS[.zzzzzzzz]
//
// You can also optionally have an ending Z to indicate UTC or indicate a specific
// timezone using ±HH, ±HHMM or ±HH:MM at the end of the string.
func TimestampFromString(val string, unit TimeUnit) (Timestamp, error) {
tm, _, err := TimestampFromStringInLocation(val, unit, time.UTC)
return tm, err
}
func (t Timestamp) ToTime(unit TimeUnit) time.Time {
switch unit {
case Second:
return time.Unix(int64(t), 0).UTC()
case Millisecond:
return time.UnixMilli(int64(t)).UTC()
case Microsecond:
return time.UnixMicro(int64(t)).UTC()
default:
return time.Unix(0, int64(t)).UTC()
}
}
// TimestampFromTime allows converting time.Time to Timestamp
func TimestampFromTime(val time.Time, unit TimeUnit) (Timestamp, error) {
switch unit {
case Second:
return Timestamp(val.Unix()), nil
case Millisecond:
return Timestamp(val.Unix()*1e3 + int64(val.Nanosecond())/1e6), nil
case Microsecond:
return Timestamp(val.Unix()*1e6 + int64(val.Nanosecond())/1e3), nil
case Nanosecond:
return Timestamp(val.UnixNano()), nil
default:
return 0, fmt.Errorf("%w: unexpected timestamp unit: %s", ErrInvalid, unit)
}
}
// Time32FromString parses a string to return a Time32 value in the given unit,
// unit needs to be only seconds or milliseconds and the string should be in the
// form of HH:MM or HH:MM:SS[.zzz] where the fractions of a second are optional.
func Time32FromString(val string, unit TimeUnit) (Time32, error) {
switch unit {
case Second:
if len(val) > 8 {
return 0, xerrors.New("cannot convert larger than second precision to time32s")
}
case Millisecond:
if len(val) > 12 {
return 0, xerrors.New("cannot convert larger than millisecond precision to time32ms")
}
case Microsecond, Nanosecond:
return 0, xerrors.New("time32 can only be seconds or milliseconds")
}
var (
out time.Time
err error
)
switch {
case len(val) == 5:
out, err = time.Parse("15:04", val)
default:
out, err = time.Parse("15:04:05.999", val)
}
if err != nil {
return 0, err
}
t := out.Sub(time.Date(0, 1, 1, 0, 0, 0, 0, time.UTC))
if unit == Second {
return Time32(t.Seconds()), nil
}
return Time32(t.Milliseconds()), nil
}
func (t Time32) ToTime(unit TimeUnit) time.Time {
return time.Unix(0, int64(t)*int64(unit.Multiplier())).UTC()
}
func (t Time32) FormattedString(unit TimeUnit) string {
const baseFmt = "15:04:05"
tm := t.ToTime(unit)
switch unit {
case Second:
return tm.Format(baseFmt)
case Millisecond:
return tm.Format(baseFmt + ".000")
}
return ""
}
// Time64FromString parses a string to return a Time64 value in the given unit,
// unit needs to be only microseconds or nanoseconds and the string should be in the
// form of HH:MM or HH:MM:SS[.zzzzzzzzz] where the fractions of a second are optional.
func Time64FromString(val string, unit TimeUnit) (Time64, error) {
// don't need to check length for nanoseconds as Parse will already error
// if more than 9 digits are provided for the fractional second
switch unit {
case Microsecond:
if len(val) > 15 {
return 0, xerrors.New("cannot convert larger than microsecond precision to time64us")
}
case Second, Millisecond:
return 0, xerrors.New("time64 should only be microseconds or nanoseconds")
}
var (
out time.Time
err error
)
switch {
case len(val) == 5:
out, err = time.Parse("15:04", val)
default:
out, err = time.Parse("15:04:05.999999999", val)
}
if err != nil {
return 0, err
}
t := out.Sub(time.Date(0, 1, 1, 0, 0, 0, 0, time.UTC))
if unit == Microsecond {
return Time64(t.Microseconds()), nil
}
return Time64(t.Nanoseconds()), nil
}
func (t Time64) ToTime(unit TimeUnit) time.Time {
return time.Unix(0, int64(t)*int64(unit.Multiplier())).UTC()
}
func (t Time64) FormattedString(unit TimeUnit) string {
const baseFmt = "15:04:05.000000"
tm := t.ToTime(unit)
switch unit {
case Microsecond:
return tm.Format(baseFmt)
case Nanosecond:
return tm.Format(baseFmt + "000")
}
return ""
}
const (
Second TimeUnit = iota
Millisecond
Microsecond
Nanosecond
)
var TimeUnitValues = []TimeUnit{Second, Millisecond, Microsecond, Nanosecond}
// Multiplier returns a time.Duration value to multiply by in order to
// convert the value into nanoseconds
func (u TimeUnit) Multiplier() time.Duration {
return [...]time.Duration{time.Second, time.Millisecond, time.Microsecond, time.Nanosecond}[uint(u)&3]
}
func (u TimeUnit) String() string { return [...]string{"s", "ms", "us", "ns"}[uint(u)&3] }
type TemporalWithUnit interface {
FixedWidthDataType
TimeUnit() TimeUnit
}
// TimestampType is encoded as a 64-bit signed integer since the UNIX epoch (2017-01-01T00:00:00Z).
// The zero-value is a second and time zone neutral. Time zone neutral can be
// considered UTC without having "UTC" as a time zone.
type TimestampType struct {
Unit TimeUnit
TimeZone string
loc *time.Location
}
func (*TimestampType) ID() Type { return TIMESTAMP }
func (*TimestampType) Name() string { return "timestamp" }
func (t *TimestampType) String() string {
switch len(t.TimeZone) {
case 0:
return "timestamp[" + t.Unit.String() + "]"
default:
return "timestamp[" + t.Unit.String() + ", tz=" + t.TimeZone + "]"
}
}
func (t *TimestampType) Fingerprint() string {
return fmt.Sprintf("%s%d:%s", typeFingerprint(t)+string(timeUnitFingerprint(t.Unit)), len(t.TimeZone), t.TimeZone)
}
// BitWidth returns the number of bits required to store a single element of this data type in memory.
func (*TimestampType) BitWidth() int { return 64 }
func (*TimestampType) Bytes() int { return Int64SizeBytes }
func (*TimestampType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(TimestampSizeBytes)}}
}
func (t *TimestampType) TimeUnit() TimeUnit { return t.Unit }
// ClearCachedLocation clears the cached time.Location object in the type.
// This should be called if you change the value of the TimeZone after having
// potentially called GetZone.
func (t *TimestampType) ClearCachedLocation() {
t.loc = nil
}
// GetZone returns a *time.Location that represents the current TimeZone member
// of the TimestampType. If it is "", "UTC", or "utc", you'll get time.UTC.
// Otherwise it must either be a valid tzdata string such as "America/New_York"
// or of the format +HH:MM or -HH:MM indicating an absolute offset.
//
// The location object will be cached in the TimestampType for subsequent calls
// so if you change the value of TimeZone after calling this, make sure to call
// ClearCachedLocation.
func (t *TimestampType) GetZone() (*time.Location, error) {
if t.loc != nil {
return t.loc, nil
}
// the TimeZone string is allowed to be either a valid tzdata string
// such as "America/New_York" or an absolute offset of the form -XX:XX
// or +XX:XX
//
// As such we have two methods we can try, first we'll try LoadLocation
// and if that fails, we'll test for an absolute offset.
if t.TimeZone == "" || t.TimeZone == "UTC" || t.TimeZone == "utc" {
t.loc = time.UTC
return time.UTC, nil
}
if loc, err := time.LoadLocation(t.TimeZone); err == nil {
t.loc = loc
return t.loc, err
}
// at this point we know that the timezone isn't empty, and didn't match
// anything in the tzdata names. So either it's an absolute offset
// or it's invalid.
timetz, err := time.Parse("-07:00", t.TimeZone)
if err != nil {
return time.UTC, fmt.Errorf("could not find timezone location for '%s'", t.TimeZone)
}
_, offset := timetz.Zone()
t.loc = time.FixedZone(t.TimeZone, offset)
return t.loc, nil
}
// GetToTimeFunc returns a function for converting an arrow.Timestamp value into a
// time.Time object with proper TimeZone and precision. If the TimeZone is invalid
// this will return an error. It calls GetZone to get the timezone for consistency.
func (t *TimestampType) GetToTimeFunc() (func(Timestamp) time.Time, error) {
tz, err := t.GetZone()
if err != nil {
return nil, err
}
switch t.Unit {
case Second:
return func(v Timestamp) time.Time { return time.Unix(int64(v), 0).In(tz) }, nil
case Millisecond:
return func(v Timestamp) time.Time { return time.UnixMilli(int64(v)).In(tz) }, nil
case Microsecond:
return func(v Timestamp) time.Time { return time.UnixMicro(int64(v)).In(tz) }, nil
case Nanosecond:
return func(v Timestamp) time.Time { return time.Unix(0, int64(v)).In(tz) }, nil
}
return nil, fmt.Errorf("invalid timestamp unit: %s", t.Unit)
}
// Time32Type is encoded as a 32-bit signed integer, representing either seconds or milliseconds since midnight.
type Time32Type struct {
Unit TimeUnit
}
func (*Time32Type) ID() Type { return TIME32 }
func (*Time32Type) Name() string { return "time32" }
func (*Time32Type) BitWidth() int { return 32 }
func (*Time32Type) Bytes() int { return Int32SizeBytes }
func (t *Time32Type) String() string { return "time32[" + t.Unit.String() + "]" }
func (t *Time32Type) Fingerprint() string {
return typeFingerprint(t) + string(timeUnitFingerprint(t.Unit))
}
func (Time32Type) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(Time32SizeBytes)}}
}
func (t *Time32Type) TimeUnit() TimeUnit { return t.Unit }
// Time64Type is encoded as a 64-bit signed integer, representing either microseconds or nanoseconds since midnight.
type Time64Type struct {
Unit TimeUnit
}
func (*Time64Type) ID() Type { return TIME64 }
func (*Time64Type) Name() string { return "time64" }
func (*Time64Type) BitWidth() int { return 64 }
func (*Time64Type) Bytes() int { return Int64SizeBytes }
func (t *Time64Type) String() string { return "time64[" + t.Unit.String() + "]" }
func (t *Time64Type) Fingerprint() string {
return typeFingerprint(t) + string(timeUnitFingerprint(t.Unit))
}
func (Time64Type) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(Time64SizeBytes)}}
}
func (t *Time64Type) TimeUnit() TimeUnit { return t.Unit }
// DurationType is encoded as a 64-bit signed integer, representing an amount
// of elapsed time without any relation to a calendar artifact.
type DurationType struct {
Unit TimeUnit
}
func (*DurationType) ID() Type { return DURATION }
func (*DurationType) Name() string { return "duration" }
func (*DurationType) BitWidth() int { return 64 }
func (*DurationType) Bytes() int { return Int64SizeBytes }
func (t *DurationType) String() string { return "duration[" + t.Unit.String() + "]" }
func (t *DurationType) Fingerprint() string {
return typeFingerprint(t) + string(timeUnitFingerprint(t.Unit))
}
func (DurationType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(DurationSizeBytes)}}
}
func (t *DurationType) TimeUnit() TimeUnit { return t.Unit }
// Float16Type represents a floating point value encoded with a 16-bit precision.
type Float16Type struct{}
func (t *Float16Type) ID() Type { return FLOAT16 }
func (t *Float16Type) Name() string { return "float16" }
func (t *Float16Type) String() string { return "float16" }
func (t *Float16Type) Fingerprint() string { return typeFingerprint(t) }
// BitWidth returns the number of bits required to store a single element of this data type in memory.
func (t *Float16Type) BitWidth() int { return 16 }
func (Float16Type) Bytes() int { return Float16SizeBytes }
func (Float16Type) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(Float16SizeBytes)}}
}
type DecimalType interface {
DataType
GetPrecision() int32
GetScale() int32
}
func NewDecimalType(id Type, prec, scale int32) (DecimalType, error) {
switch id {
case DECIMAL128:
return &Decimal128Type{Precision: prec, Scale: scale}, nil
case DECIMAL256:
return &Decimal256Type{Precision: prec, Scale: scale}, nil
default:
return nil, fmt.Errorf("%w: must use DECIMAL128 or DECIMAL256 to create a DecimalType", ErrInvalid)
}
}
// Decimal128Type represents a fixed-size 128-bit decimal type.
type Decimal128Type struct {
Precision int32
Scale int32
}
func (*Decimal128Type) ID() Type { return DECIMAL128 }
func (*Decimal128Type) Name() string { return "decimal" }
func (*Decimal128Type) BitWidth() int { return 128 }
func (*Decimal128Type) Bytes() int { return Decimal128SizeBytes }
func (t *Decimal128Type) String() string {
return fmt.Sprintf("%s(%d, %d)", t.Name(), t.Precision, t.Scale)
}
func (t *Decimal128Type) Fingerprint() string {
return fmt.Sprintf("%s[%d,%d,%d]", typeFingerprint(t), t.BitWidth(), t.Precision, t.Scale)
}
func (t *Decimal128Type) GetPrecision() int32 { return t.Precision }
func (t *Decimal128Type) GetScale() int32 { return t.Scale }
func (Decimal128Type) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(Decimal128SizeBytes)}}
}
// Decimal256Type represents a fixed-size 256-bit decimal type.
type Decimal256Type struct {
Precision int32
Scale int32
}
func (*Decimal256Type) ID() Type { return DECIMAL256 }
func (*Decimal256Type) Name() string { return "decimal256" }
func (*Decimal256Type) BitWidth() int { return 256 }
func (*Decimal256Type) Bytes() int { return Decimal256SizeBytes }
func (t *Decimal256Type) String() string {
return fmt.Sprintf("%s(%d, %d)", t.Name(), t.Precision, t.Scale)
}
func (t *Decimal256Type) Fingerprint() string {
return fmt.Sprintf("%s[%d,%d,%d]", typeFingerprint(t), t.BitWidth(), t.Precision, t.Scale)
}
func (t *Decimal256Type) GetPrecision() int32 { return t.Precision }
func (t *Decimal256Type) GetScale() int32 { return t.Scale }
func (Decimal256Type) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(Decimal256SizeBytes)}}
}
// MonthInterval represents a number of months.
type MonthInterval int32
func (m *MonthInterval) UnmarshalJSON(data []byte) error {
var val struct {
Months int32 `json:"months"`
}
if err := json.Unmarshal(data, &val); err != nil {
return err
}
*m = MonthInterval(val.Months)
return nil
}
func (m MonthInterval) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Months int32 `json:"months"`
}{int32(m)})
}
// MonthIntervalType is encoded as a 32-bit signed integer,
// representing a number of months.
type MonthIntervalType struct{}
func (*MonthIntervalType) ID() Type { return INTERVAL_MONTHS }
func (*MonthIntervalType) Name() string { return "month_interval" }
func (*MonthIntervalType) String() string { return "month_interval" }
func (*MonthIntervalType) Fingerprint() string { return typeIDFingerprint(INTERVAL_MONTHS) + "M" }
// BitWidth returns the number of bits required to store a single element of this data type in memory.
func (t *MonthIntervalType) BitWidth() int { return 32 }
func (MonthIntervalType) Bytes() int { return Int32SizeBytes }
func (MonthIntervalType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(MonthIntervalSizeBytes)}}
}
// DayTimeInterval represents a number of days and milliseconds (fraction of day).
type DayTimeInterval struct {
Days int32 `json:"days"`
Milliseconds int32 `json:"milliseconds"`
}
// DayTimeIntervalType is encoded as a pair of 32-bit signed integer,
// representing a number of days and milliseconds (fraction of day).
type DayTimeIntervalType struct{}
func (*DayTimeIntervalType) ID() Type { return INTERVAL_DAY_TIME }
func (*DayTimeIntervalType) Name() string { return "day_time_interval" }
func (*DayTimeIntervalType) String() string { return "day_time_interval" }
func (*DayTimeIntervalType) Fingerprint() string { return typeIDFingerprint(INTERVAL_DAY_TIME) + "d" }
// BitWidth returns the number of bits required to store a single element of this data type in memory.
func (t *DayTimeIntervalType) BitWidth() int { return 64 }
func (DayTimeIntervalType) Bytes() int { return DayTimeIntervalSizeBytes }
func (DayTimeIntervalType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(DayTimeIntervalSizeBytes)}}
}
// MonthDayNanoInterval represents a number of months, days and nanoseconds (fraction of day).
type MonthDayNanoInterval struct {
Months int32 `json:"months"`
Days int32 `json:"days"`
Nanoseconds int64 `json:"nanoseconds"`
}
// MonthDayNanoIntervalType is encoded as two signed 32-bit integers representing
// a number of months and a number of days, followed by a 64-bit integer representing
// the number of nanoseconds since midnight for fractions of a day.
type MonthDayNanoIntervalType struct{}
func (*MonthDayNanoIntervalType) ID() Type { return INTERVAL_MONTH_DAY_NANO }
func (*MonthDayNanoIntervalType) Name() string { return "month_day_nano_interval" }
func (*MonthDayNanoIntervalType) String() string { return "month_day_nano_interval" }
func (*MonthDayNanoIntervalType) Fingerprint() string {
return typeIDFingerprint(INTERVAL_MONTH_DAY_NANO) + "N"
}
// BitWidth returns the number of bits required to store a single element of this data type in memory.
func (*MonthDayNanoIntervalType) BitWidth() int { return 128 }
func (*MonthDayNanoIntervalType) Bytes() int { return MonthDayNanoIntervalSizeBytes }
func (MonthDayNanoIntervalType) Layout() DataTypeLayout {
return DataTypeLayout{Buffers: []BufferSpec{SpecBitmap(), SpecFixedWidth(MonthDayNanoIntervalSizeBytes)}}
}
type TimestampConvertOp int8
const (
ConvDIVIDE = iota
ConvMULTIPLY
)
var timestampConversion = [...][4]struct {
op TimestampConvertOp
factor int64
}{
Nanosecond: {
Nanosecond: {ConvMULTIPLY, int64(time.Nanosecond)},
Microsecond: {ConvDIVIDE, int64(time.Microsecond)},
Millisecond: {ConvDIVIDE, int64(time.Millisecond)},
Second: {ConvDIVIDE, int64(time.Second)},
},
Microsecond: {
Nanosecond: {ConvMULTIPLY, int64(time.Microsecond)},
Microsecond: {ConvMULTIPLY, 1},
Millisecond: {ConvDIVIDE, int64(time.Millisecond / time.Microsecond)},
Second: {ConvDIVIDE, int64(time.Second / time.Microsecond)},
},
Millisecond: {
Nanosecond: {ConvMULTIPLY, int64(time.Millisecond)},
Microsecond: {ConvMULTIPLY, int64(time.Millisecond / time.Microsecond)},
Millisecond: {ConvMULTIPLY, 1},
Second: {ConvDIVIDE, int64(time.Second / time.Millisecond)},
},
Second: {
Nanosecond: {ConvMULTIPLY, int64(time.Second)},
Microsecond: {ConvMULTIPLY, int64(time.Second / time.Microsecond)},
Millisecond: {ConvMULTIPLY, int64(time.Second / time.Millisecond)},
Second: {ConvMULTIPLY, 1},
},
}
func GetTimestampConvert(in, out TimeUnit) (op TimestampConvertOp, factor int64) {
conv := timestampConversion[int(in)][int(out)]
return conv.op, conv.factor
}
func ConvertTimestampValue(in, out TimeUnit, value int64) int64 {
conv := timestampConversion[int(in)][int(out)]
switch conv.op {
case ConvMULTIPLY:
return value * conv.factor
case ConvDIVIDE:
return value / conv.factor
}
return 0
}
// DictionaryType represents categorical or dictionary-encoded in-memory data
// It contains a dictionary-encoded value type (any type) and an index type
// (any integer type).
type DictionaryType struct {
IndexType DataType
ValueType DataType
Ordered bool
}
func (*DictionaryType) ID() Type { return DICTIONARY }
func (*DictionaryType) Name() string { return "dictionary" }
func (d *DictionaryType) BitWidth() int { return d.IndexType.(FixedWidthDataType).BitWidth() }
func (d *DictionaryType) Bytes() int { return d.IndexType.(FixedWidthDataType).Bytes() }
func (d *DictionaryType) String() string {
return fmt.Sprintf("%s<values=%s, indices=%s, ordered=%t>",
d.Name(), d.ValueType, d.IndexType, d.Ordered)
}
func (d *DictionaryType) Fingerprint() string {
indexFingerprint := d.IndexType.Fingerprint()
valueFingerprint := d.ValueType.Fingerprint()
ordered := "1"
if !d.Ordered {
ordered = "0"
}
if len(valueFingerprint) > 0 {
return typeFingerprint(d) + indexFingerprint + valueFingerprint + ordered
}
return ordered
}
func (d *DictionaryType) Layout() DataTypeLayout {
layout := d.IndexType.Layout()
layout.HasDict = true
return layout
}
var (
FixedWidthTypes = struct {
Boolean FixedWidthDataType
Date32 FixedWidthDataType
Date64 FixedWidthDataType
DayTimeInterval FixedWidthDataType
Duration_s FixedWidthDataType
Duration_ms FixedWidthDataType
Duration_us FixedWidthDataType
Duration_ns FixedWidthDataType
Float16 FixedWidthDataType
MonthInterval FixedWidthDataType
Time32s FixedWidthDataType
Time32ms FixedWidthDataType
Time64us FixedWidthDataType
Time64ns FixedWidthDataType
Timestamp_s FixedWidthDataType
Timestamp_ms FixedWidthDataType
Timestamp_us FixedWidthDataType
Timestamp_ns FixedWidthDataType
MonthDayNanoInterval FixedWidthDataType
}{
Boolean: &BooleanType{},
Date32: &Date32Type{},
Date64: &Date64Type{},
DayTimeInterval: &DayTimeIntervalType{},
Duration_s: &DurationType{Unit: Second},
Duration_ms: &DurationType{Unit: Millisecond},
Duration_us: &DurationType{Unit: Microsecond},
Duration_ns: &DurationType{Unit: Nanosecond},
Float16: &Float16Type{},
MonthInterval: &MonthIntervalType{},
Time32s: &Time32Type{Unit: Second},
Time32ms: &Time32Type{Unit: Millisecond},
Time64us: &Time64Type{Unit: Microsecond},
Time64ns: &Time64Type{Unit: Nanosecond},
Timestamp_s: &TimestampType{Unit: Second, TimeZone: "UTC"},
Timestamp_ms: &TimestampType{Unit: Millisecond, TimeZone: "UTC"},
Timestamp_us: &TimestampType{Unit: Microsecond, TimeZone: "UTC"},
Timestamp_ns: &TimestampType{Unit: Nanosecond, TimeZone: "UTC"},
MonthDayNanoInterval: &MonthDayNanoIntervalType{},
}
_ FixedWidthDataType = (*FixedSizeBinaryType)(nil)
)