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literals.go
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literals.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 iceberg
import (
"bytes"
"cmp"
"encoding"
"encoding/binary"
"errors"
"fmt"
"math"
"math/big"
"reflect"
"strconv"
"time"
"unsafe"
"github.com/apache/arrow/go/v16/arrow"
"github.com/apache/arrow/go/v16/arrow/decimal128"
"github.com/google/uuid"
)
// LiteralType is a generic type constraint for the explicit Go types that we allow
// for literal values. This represents the actual primitive types that exist in Iceberg
type LiteralType interface {
bool | int32 | int64 | float32 | float64 | Date |
Time | Timestamp | string | []byte | uuid.UUID | Decimal
}
// Comparator is a comparison function for specific literal types:
//
// returns 0 if v1 == v2
// returns <0 if v1 < v2
// returns >0 if v1 > v2
type Comparator[T LiteralType] func(v1, v2 T) int
// Literal is a non-null literal value. It can be casted using To and be checked for
// equality against other literals.
type Literal interface {
fmt.Stringer
encoding.BinaryMarshaler
Type() Type
To(Type) (Literal, error)
Equals(Literal) bool
}
// TypedLiteral is a generic interface for Literals so that you can retrieve the value.
// This is based on the physical representative type, which means that FixedLiteral and
// BinaryLiteral will both return []byte, etc.
type TypedLiteral[T LiteralType] interface {
Literal
Value() T
Comparator() Comparator[T]
}
type NumericLiteral interface {
Literal
Increment() Literal
Decrement() Literal
}
// NewLiteral provides a literal based on the type of T
func NewLiteral[T LiteralType](val T) Literal {
switch v := any(val).(type) {
case bool:
return BoolLiteral(v)
case int32:
return Int32Literal(v)
case int64:
return Int64Literal(v)
case float32:
return Float32Literal(v)
case float64:
return Float64Literal(v)
case Date:
return DateLiteral(v)
case Time:
return TimeLiteral(v)
case Timestamp:
return TimestampLiteral(v)
case string:
return StringLiteral(v)
case []byte:
return BinaryLiteral(v)
case uuid.UUID:
return UUIDLiteral(v)
case Decimal:
return DecimalLiteral(v)
}
panic("can't happen due to literal type constraint")
}
// LiteralFromBytes uses the defined Iceberg spec for how to serialize a value of
// a the provided type and returns the appropriate Literal value from it.
//
// If you already have a value of the desired Literal type, you could alternatively
// call UnmarshalBinary on it yourself manually.
//
// This is primarily used for retrieving stat values.
func LiteralFromBytes(typ Type, data []byte) (Literal, error) {
if data == nil {
return nil, ErrInvalidBinSerialization
}
switch t := typ.(type) {
case BooleanType:
var v BoolLiteral
err := v.UnmarshalBinary(data)
return v, err
case Int32Type:
var v Int32Literal
err := v.UnmarshalBinary(data)
return v, err
case Int64Type:
var v Int64Literal
err := v.UnmarshalBinary(data)
return v, err
case Float32Type:
var v Float32Literal
err := v.UnmarshalBinary(data)
return v, err
case Float64Type:
var v Float64Literal
err := v.UnmarshalBinary(data)
return v, err
case StringType:
var v StringLiteral
err := v.UnmarshalBinary(data)
return v, err
case BinaryType:
var v BinaryLiteral
err := v.UnmarshalBinary(data)
return v, err
case FixedType:
if len(data) != t.Len() {
return nil, fmt.Errorf("%w: expected length %d for type %s, got %d",
ErrInvalidBinSerialization, t.Len(), t, len(data))
}
var v FixedLiteral
err := v.UnmarshalBinary(data)
return v, err
case DecimalType:
v := DecimalLiteral{Scale: t.scale}
err := v.UnmarshalBinary(data)
return v, err
case DateType:
var v DateLiteral
err := v.UnmarshalBinary(data)
return v, err
case TimeType:
var v TimeLiteral
err := v.UnmarshalBinary(data)
return v, err
case TimestampType, TimestampTzType:
var v TimestampLiteral
err := v.UnmarshalBinary(data)
return v, err
case UUIDType:
var v UUIDLiteral
err := v.UnmarshalBinary(data)
return v, err
}
return nil, ErrType
}
// convenience to avoid repreating this pattern for primitive types
func literalEq[L interface {
comparable
LiteralType
}, T TypedLiteral[L]](lhs T, other Literal) bool {
rhs, ok := other.(T)
if !ok {
return false
}
return lhs.Value() == rhs.Value()
}
// AboveMaxLiteral represents values that are above the maximum for their type
// such as values > math.MaxInt32 for an Int32Literal
type AboveMaxLiteral interface {
Literal
aboveMax()
}
// BelowMinLiteral represents values that are below the minimum for their type
// such as values < math.MinInt32 for an Int32Literal
type BelowMinLiteral interface {
Literal
belowMin()
}
type aboveMaxLiteral[T int32 | int64 | float32 | float64] struct {
value T
}
func (ab aboveMaxLiteral[T]) MarshalBinary() (data []byte, err error) {
return nil, fmt.Errorf("%w: cannot marshal above max literal",
ErrInvalidBinSerialization)
}
func (ab aboveMaxLiteral[T]) aboveMax() {}
func (ab aboveMaxLiteral[T]) Type() Type {
var z T
switch any(z).(type) {
case int32:
return PrimitiveTypes.Int32
case int64:
return PrimitiveTypes.Int64
case float32:
return PrimitiveTypes.Float32
case float64:
return PrimitiveTypes.Float64
default:
panic("should never happen")
}
}
func (ab aboveMaxLiteral[T]) To(t Type) (Literal, error) {
if ab.Type().Equals(t) {
return ab, nil
}
return nil, fmt.Errorf("%w: cannot change type of AboveMax%sLiteral",
ErrBadCast, reflect.TypeOf(T(0)).String())
}
func (ab aboveMaxLiteral[T]) Value() T { return ab.value }
func (ab aboveMaxLiteral[T]) String() string { return "AboveMax" }
func (ab aboveMaxLiteral[T]) Equals(other Literal) bool {
// AboveMaxLiteral isn't comparable and thus isn't even equal to itself
return false
}
type belowMinLiteral[T int32 | int64 | float32 | float64] struct {
value T
}
func (bm belowMinLiteral[T]) MarshalBinary() (data []byte, err error) {
return nil, fmt.Errorf("%w: cannot marshal above max literal",
ErrInvalidBinSerialization)
}
func (bm belowMinLiteral[T]) belowMin() {}
func (bm belowMinLiteral[T]) Type() Type {
var z T
switch any(z).(type) {
case int32:
return PrimitiveTypes.Int32
case int64:
return PrimitiveTypes.Int64
case float32:
return PrimitiveTypes.Float32
case float64:
return PrimitiveTypes.Float64
default:
panic("should never happen")
}
}
func (bm belowMinLiteral[T]) To(t Type) (Literal, error) {
if bm.Type().Equals(t) {
return bm, nil
}
return nil, fmt.Errorf("%w: cannot change type of BelowMin%sLiteral",
ErrBadCast, reflect.TypeOf(T(0)).String())
}
func (bm belowMinLiteral[T]) Value() T { return bm.value }
func (bm belowMinLiteral[T]) String() string { return "BelowMin" }
func (bm belowMinLiteral[T]) Equals(other Literal) bool {
// BelowMinLiteral isn't comparable and thus isn't even equal to itself
return false
}
func Int32AboveMaxLiteral() Literal {
return aboveMaxLiteral[int32]{value: math.MaxInt32}
}
func Int64AboveMaxLiteral() Literal {
return aboveMaxLiteral[int64]{value: math.MaxInt64}
}
func Float32AboveMaxLiteral() Literal {
return aboveMaxLiteral[float32]{value: math.MaxFloat32}
}
func Float64AboveMaxLiteral() Literal {
return aboveMaxLiteral[float64]{value: math.MaxFloat64}
}
func Int32BelowMinLiteral() Literal {
return belowMinLiteral[int32]{value: math.MinInt32}
}
func Int64BelowMinLiteral() Literal {
return belowMinLiteral[int64]{value: math.MinInt64}
}
func Float32BelowMinLiteral() Literal {
return belowMinLiteral[float32]{value: -math.MaxFloat32}
}
func Float64BelowMinLiteral() Literal {
return belowMinLiteral[float64]{value: -math.MaxFloat64}
}
type BoolLiteral bool
func (BoolLiteral) Comparator() Comparator[bool] {
return func(v1, v2 bool) int {
if v1 {
if v2 {
return 0
}
return 1
}
return -1
}
}
func (b BoolLiteral) Type() Type { return PrimitiveTypes.Bool }
func (b BoolLiteral) Value() bool { return bool(b) }
func (b BoolLiteral) String() string { return strconv.FormatBool(bool(b)) }
func (b BoolLiteral) To(t Type) (Literal, error) {
switch t.(type) {
case BooleanType:
return b, nil
}
return nil, fmt.Errorf("%w: BoolLiteral to %s", ErrBadCast, t)
}
func (b BoolLiteral) Equals(l Literal) bool {
return literalEq(b, l)
}
var (
falseBin, trueBin = [1]byte{0x0}, [1]byte{0x1}
)
func (b BoolLiteral) MarshalBinary() (data []byte, err error) {
// stored as 0x00 for false, and anything non-zero for True
if b {
return trueBin[:], nil
}
return falseBin[:], nil
}
func (b *BoolLiteral) UnmarshalBinary(data []byte) error {
// stored as 0x00 for false and anything non-zero for True
if len(data) < 1 {
return fmt.Errorf("%w: expected at least 1 byte for bool", ErrInvalidBinSerialization)
}
*b = data[0] != 0
return nil
}
type Int32Literal int32
func (Int32Literal) Comparator() Comparator[int32] { return cmp.Compare[int32] }
func (i Int32Literal) Type() Type { return PrimitiveTypes.Int32 }
func (i Int32Literal) Value() int32 { return int32(i) }
func (i Int32Literal) String() string { return strconv.FormatInt(int64(i), 10) }
func (i Int32Literal) To(t Type) (Literal, error) {
switch t := t.(type) {
case Int32Type:
return i, nil
case Int64Type:
return Int64Literal(i), nil
case Float32Type:
return Float32Literal(i), nil
case Float64Type:
return Float64Literal(i), nil
case DateType:
return DateLiteral(i), nil
case TimeType:
return TimeLiteral(i), nil
case TimestampType:
return TimestampLiteral(i), nil
case TimestampTzType:
return TimestampLiteral(i), nil
case DecimalType:
unscaled := Decimal{Val: decimal128.FromI64(int64(i)), Scale: 0}
if t.scale == 0 {
return DecimalLiteral(unscaled), nil
}
out, err := unscaled.Val.Rescale(0, int32(t.scale))
if err != nil {
return nil, fmt.Errorf("%w: failed to cast to DecimalType: %s", ErrBadCast, err.Error())
}
return DecimalLiteral{Val: out, Scale: t.scale}, nil
}
return nil, fmt.Errorf("%w: Int32Literal to %s", ErrBadCast, t)
}
func (i Int32Literal) Equals(other Literal) bool {
return literalEq(i, other)
}
func (i Int32Literal) Increment() Literal {
if i == math.MaxInt32 {
return Int32AboveMaxLiteral()
}
return Int32Literal(i + 1)
}
func (i Int32Literal) Decrement() Literal {
if i == math.MinInt32 {
return Int32BelowMinLiteral()
}
return Int32Literal(i - 1)
}
func (i Int32Literal) MarshalBinary() (data []byte, err error) {
// stored as 4 bytes in little endian order
data = make([]byte, 4)
binary.LittleEndian.PutUint32(data, uint32(i))
return
}
func (i *Int32Literal) UnmarshalBinary(data []byte) error {
// stored as 4 bytes little endian
if len(data) != 4 {
return fmt.Errorf("%w: expected 4 bytes for int32 value, got %d",
ErrInvalidBinSerialization, len(data))
}
*i = Int32Literal(binary.LittleEndian.Uint32(data))
return nil
}
type Int64Literal int64
func (Int64Literal) Comparator() Comparator[int64] { return cmp.Compare[int64] }
func (i Int64Literal) Type() Type { return PrimitiveTypes.Int64 }
func (i Int64Literal) Value() int64 { return int64(i) }
func (i Int64Literal) String() string { return strconv.FormatInt(int64(i), 10) }
func (i Int64Literal) To(t Type) (Literal, error) {
switch t := t.(type) {
case Int32Type:
if math.MaxInt32 < i {
return Int32AboveMaxLiteral(), nil
} else if math.MinInt32 > i {
return Int32BelowMinLiteral(), nil
}
return Int32Literal(i), nil
case Int64Type:
return i, nil
case Float32Type:
return Float32Literal(i), nil
case Float64Type:
return Float64Literal(i), nil
case DateType:
return DateLiteral(i), nil
case TimeType:
return TimeLiteral(i), nil
case TimestampType:
return TimestampLiteral(i), nil
case TimestampTzType:
return TimestampLiteral(i), nil
case DecimalType:
unscaled := Decimal{Val: decimal128.FromI64(int64(i)), Scale: 0}
if t.scale == 0 {
return DecimalLiteral(unscaled), nil
}
out, err := unscaled.Val.Rescale(0, int32(t.scale))
if err != nil {
return nil, fmt.Errorf("%w: failed to cast to DecimalType: %s", ErrBadCast, err.Error())
}
return DecimalLiteral{Val: out, Scale: t.scale}, nil
}
return nil, fmt.Errorf("%w: Int64Literal to %s", ErrBadCast, t)
}
func (i Int64Literal) Equals(other Literal) bool {
return literalEq(i, other)
}
func (i Int64Literal) Increment() Literal {
if i == math.MaxInt64 {
return Int64AboveMaxLiteral()
}
return Int64Literal(i + 1)
}
func (i Int64Literal) Decrement() Literal {
if i == math.MinInt64 {
return Int64BelowMinLiteral()
}
return Int64Literal(i - 1)
}
func (i Int64Literal) MarshalBinary() (data []byte, err error) {
// stored as 8 byte little-endian
data = make([]byte, 8)
binary.LittleEndian.PutUint64(data, uint64(i))
return
}
func (i *Int64Literal) UnmarshalBinary(data []byte) error {
// stored as 8 byte little-endian
if len(data) != 8 {
return fmt.Errorf("%w: expected 8 bytes for int64 value, got %d",
ErrInvalidBinSerialization, len(data))
}
*i = Int64Literal(binary.LittleEndian.Uint64(data))
return nil
}
type Float32Literal float32
func (Float32Literal) Comparator() Comparator[float32] { return cmp.Compare[float32] }
func (f Float32Literal) Type() Type { return PrimitiveTypes.Float32 }
func (f Float32Literal) Value() float32 { return float32(f) }
func (f Float32Literal) String() string { return strconv.FormatFloat(float64(f), 'g', -1, 32) }
func (f Float32Literal) To(t Type) (Literal, error) {
switch t := t.(type) {
case Float32Type:
return f, nil
case Float64Type:
return Float64Literal(f), nil
case DecimalType:
v, err := decimal128.FromFloat32(float32(f), int32(t.precision), int32(t.scale))
if err != nil {
return nil, err
}
return DecimalLiteral{Val: v, Scale: t.scale}, nil
}
return nil, fmt.Errorf("%w: Float32Literal to %s", ErrBadCast, t)
}
func (f Float32Literal) Equals(other Literal) bool {
return literalEq(f, other)
}
func (f Float32Literal) MarshalBinary() (data []byte, err error) {
// stored as 4 bytes little endian
data = make([]byte, 4)
binary.LittleEndian.PutUint32(data, math.Float32bits(float32(f)))
return
}
func (f *Float32Literal) UnmarshalBinary(data []byte) error {
// stored as 4 bytes little endian
if len(data) != 4 {
return fmt.Errorf("%w: expected 4 bytes for float32 value, got %d",
ErrInvalidBinSerialization, len(data))
}
*f = Float32Literal(math.Float32frombits(binary.LittleEndian.Uint32(data)))
return nil
}
type Float64Literal float64
func (Float64Literal) Comparator() Comparator[float64] { return cmp.Compare[float64] }
func (f Float64Literal) Type() Type { return PrimitiveTypes.Float64 }
func (f Float64Literal) Value() float64 { return float64(f) }
func (f Float64Literal) String() string { return strconv.FormatFloat(float64(f), 'g', -1, 64) }
func (f Float64Literal) To(t Type) (Literal, error) {
switch t := t.(type) {
case Float32Type:
if math.MaxFloat32 < f {
return Float32AboveMaxLiteral(), nil
} else if -math.MaxFloat32 > f {
return Float32BelowMinLiteral(), nil
}
return Float32Literal(f), nil
case Float64Type:
return f, nil
case DecimalType:
v, err := decimal128.FromFloat64(float64(f), int32(t.precision), int32(t.scale))
if err != nil {
return nil, err
}
return DecimalLiteral{Val: v, Scale: t.scale}, nil
}
return nil, fmt.Errorf("%w: Float64Literal to %s", ErrBadCast, t)
}
func (f Float64Literal) Equals(other Literal) bool {
return literalEq(f, other)
}
func (f Float64Literal) MarshalBinary() (data []byte, err error) {
// stored as 8 bytes little endian
data = make([]byte, 8)
binary.LittleEndian.PutUint64(data, math.Float64bits(float64(f)))
return
}
func (f *Float64Literal) UnmarshalBinary(data []byte) error {
// stored as 8 bytes in little endian
if len(data) != 8 {
return fmt.Errorf("%w: expected 8 bytes for float64 value, got %d",
ErrInvalidBinSerialization, len(data))
}
*f = Float64Literal(math.Float64frombits(binary.LittleEndian.Uint64(data)))
return nil
}
type DateLiteral Date
func (DateLiteral) Comparator() Comparator[Date] { return cmp.Compare[Date] }
func (d DateLiteral) Type() Type { return PrimitiveTypes.Date }
func (d DateLiteral) Value() Date { return Date(d) }
func (d DateLiteral) String() string {
t := Date(d).ToTime()
return t.Format("2006-01-02")
}
func (d DateLiteral) To(t Type) (Literal, error) {
switch t.(type) {
case DateType:
return d, nil
}
return nil, fmt.Errorf("%w: DateLiteral to %s", ErrBadCast, t)
}
func (d DateLiteral) Equals(other Literal) bool {
return literalEq(d, other)
}
func (d DateLiteral) Increment() Literal { return DateLiteral(d + 1) }
func (d DateLiteral) Decrement() Literal { return DateLiteral(d - 1) }
func (d DateLiteral) MarshalBinary() (data []byte, err error) {
// stored as 4 byte little endian
data = make([]byte, 4)
binary.LittleEndian.PutUint32(data, uint32(d))
return
}
func (d *DateLiteral) UnmarshalBinary(data []byte) error {
// stored as 4 byte little endian
if len(data) != 4 {
return fmt.Errorf("%w: expected 4 bytes for date value, got %d",
ErrInvalidBinSerialization, len(data))
}
*d = DateLiteral(binary.LittleEndian.Uint32(data))
return nil
}
type TimeLiteral Time
func (TimeLiteral) Comparator() Comparator[Time] { return cmp.Compare[Time] }
func (t TimeLiteral) Type() Type { return PrimitiveTypes.Time }
func (t TimeLiteral) Value() Time { return Time(t) }
func (t TimeLiteral) String() string {
tm := time.UnixMicro(int64(t)).UTC()
return tm.Format("15:04:05.000000")
}
func (t TimeLiteral) To(typ Type) (Literal, error) {
switch typ.(type) {
case TimeType:
return t, nil
}
return nil, fmt.Errorf("%w: TimeLiteral to %s", ErrBadCast, typ)
}
func (t TimeLiteral) Equals(other Literal) bool {
return literalEq(t, other)
}
func (t TimeLiteral) MarshalBinary() (data []byte, err error) {
// stored as 8 byte little-endian
data = make([]byte, 8)
binary.LittleEndian.PutUint64(data, uint64(t))
return
}
func (t *TimeLiteral) UnmarshalBinary(data []byte) error {
// stored as 8 byte little-endian representing microseconds from midnight
if len(data) != 8 {
return fmt.Errorf("%w: expected 8 bytes for time value, got %d",
ErrInvalidBinSerialization, len(data))
}
*t = TimeLiteral(binary.LittleEndian.Uint64(data))
return nil
}
type TimestampLiteral Timestamp
func (TimestampLiteral) Comparator() Comparator[Timestamp] { return cmp.Compare[Timestamp] }
func (t TimestampLiteral) Type() Type { return PrimitiveTypes.Timestamp }
func (t TimestampLiteral) Value() Timestamp { return Timestamp(t) }
func (t TimestampLiteral) String() string {
tm := Timestamp(t).ToTime()
return tm.Format("2006-01-02 15:04:05.000000")
}
func (t TimestampLiteral) To(typ Type) (Literal, error) {
switch typ.(type) {
case TimestampType:
return t, nil
case TimestampTzType:
return t, nil
case DateType:
return DateLiteral(Timestamp(t).ToDate()), nil
}
return nil, fmt.Errorf("%w: TimestampLiteral to %s", ErrBadCast, typ)
}
func (t TimestampLiteral) Equals(other Literal) bool {
return literalEq(t, other)
}
func (t TimestampLiteral) Increment() Literal { return TimestampLiteral(t + 1) }
func (t TimestampLiteral) Decrement() Literal { return TimestampLiteral(t - 1) }
func (t TimestampLiteral) MarshalBinary() (data []byte, err error) {
// stored as 8 byte little endian
data = make([]byte, 8)
binary.LittleEndian.PutUint64(data, uint64(t))
return
}
func (t *TimestampLiteral) UnmarshalBinary(data []byte) error {
// stored as 8 byte little endian value representing microseconds since epoch
if len(data) != 8 {
return fmt.Errorf("%w: expected 8 bytes for timestamp value, got %d",
ErrInvalidBinSerialization, len(data))
}
*t = TimestampLiteral(binary.LittleEndian.Uint64(data))
return nil
}
type StringLiteral string
func (StringLiteral) Comparator() Comparator[string] { return cmp.Compare[string] }
func (s StringLiteral) Type() Type { return PrimitiveTypes.String }
func (s StringLiteral) Value() string { return string(s) }
func (s StringLiteral) String() string { return string(s) }
func (s StringLiteral) To(typ Type) (Literal, error) {
switch t := typ.(type) {
case StringType:
return s, nil
case Int32Type:
n, err := strconv.ParseInt(string(s), 10, 64)
if err != nil {
return nil, fmt.Errorf("%w: casting '%s' to %s",
errors.Join(ErrBadCast, err), s, typ)
}
if math.MaxInt32 < n {
return Int32AboveMaxLiteral(), nil
} else if math.MinInt32 > n {
return Int32BelowMinLiteral(), nil
}
return Int32Literal(n), nil
case Int64Type:
n, err := strconv.ParseInt(string(s), 10, 64)
if err != nil {
return nil, fmt.Errorf("%w: casting '%s' to %s",
errors.Join(ErrBadCast, err), s, typ)
}
return Int64Literal(n), nil
case Float32Type:
n, err := strconv.ParseFloat(string(s), 32)
if err != nil {
return nil, fmt.Errorf("%w: casting '%s' to %s",
errors.Join(ErrBadCast, err), s, typ)
}
return Float32Literal(n), nil
case Float64Type:
n, err := strconv.ParseFloat(string(s), 64)
if err != nil {
return nil, fmt.Errorf("%w: casting '%s' to %s",
errors.Join(ErrBadCast, err), s, typ)
}
return Float64Literal(n), nil
case DateType:
tm, err := time.Parse("2006-01-02", string(s))
if err != nil {
return nil, fmt.Errorf("%w: casting '%s' to %s - %s",
ErrBadCast, s, typ, err.Error())
}
return DateLiteral(tm.Truncate(24*time.Hour).Unix() / int64((time.Hour * 24).Seconds())), nil
case TimeType:
val, err := arrow.Time64FromString(string(s), arrow.Microsecond)
if err != nil {
return nil, fmt.Errorf("%w: casting '%s' to %s - %s",
ErrBadCast, s, typ, err.Error())
}
return TimeLiteral(val), nil
case TimestampType:
// requires RFC3339 with no time zone
tm, err := time.Parse("2006-01-02T15:04:05", string(s))
if err != nil {
return nil, fmt.Errorf("%w: invalid Timestamp format for casting from string '%s': %s",
ErrBadCast, s, err.Error())
}
return TimestampLiteral(Timestamp(tm.UTC().UnixMicro())), nil
case TimestampTzType:
// requires RFC3339 format WITH time zone
tm, err := time.Parse(time.RFC3339, string(s))
if err != nil {
return nil, fmt.Errorf("%w: invalid TimestampTz format for casting from string '%s': %s",
ErrBadCast, s, err.Error())
}
return TimestampLiteral(Timestamp(tm.UTC().UnixMicro())), nil
case UUIDType:
val, err := uuid.Parse(string(s))
if err != nil {
return nil, fmt.Errorf("%w: casting '%s' to %s - %s",
ErrBadCast, s, typ, err.Error())
}
return UUIDLiteral(val), nil
case DecimalType:
n, err := decimal128.FromString(string(s), int32(t.precision), int32(t.scale))
if err != nil {
return nil, fmt.Errorf("%w: casting '%s' to %s - %s",
ErrBadCast, s, typ, err.Error())
}
return DecimalLiteral{Val: n, Scale: t.scale}, nil
case BooleanType:
val, err := strconv.ParseBool(string(s))
if err != nil {
return nil, fmt.Errorf("%w: casting '%s' to %s - %s",
ErrBadCast, s, typ, err.Error())
}
return BoolLiteral(val), nil
case BinaryType:
return BinaryLiteral(s), nil
case FixedType:
if len(s) != t.len {
return nil, fmt.Errorf("%w: cast '%s' to %s - wrong length",
ErrBadCast, s, t)
}
return FixedLiteral(s), nil
}
return nil, fmt.Errorf("%w: StringLiteral to %s", ErrBadCast, typ)
}
func (s StringLiteral) Equals(other Literal) bool {
return literalEq(s, other)
}
func (s StringLiteral) MarshalBinary() (data []byte, err error) {
// stored as UTF-8 bytes without length
// avoid copying by just returning a slice of the raw bytes
data = unsafe.Slice(unsafe.StringData(string(s)), len(s))
return
}
func (s *StringLiteral) UnmarshalBinary(data []byte) error {
// stored as UTF-8 bytes without length
// avoid copy, but this means that the passed in slice is being given
// to the literal for ownership
*s = StringLiteral(unsafe.String(unsafe.SliceData(data), len(data)))
return nil
}
type BinaryLiteral []byte
func (BinaryLiteral) Comparator() Comparator[[]byte] {
return bytes.Compare
}
func (b BinaryLiteral) Type() Type { return PrimitiveTypes.Binary }
func (b BinaryLiteral) Value() []byte { return []byte(b) }
func (b BinaryLiteral) String() string { return string(b) }
func (b BinaryLiteral) To(typ Type) (Literal, error) {
switch t := typ.(type) {
case UUIDType:
val, err := uuid.FromBytes(b)
if err != nil {
return nil, fmt.Errorf("%w: cannot convert BinaryLiteral to UUID",
errors.Join(ErrBadCast, err))
}
return UUIDLiteral(val), nil
case FixedType:
if len(b) == t.len {
return FixedLiteral(b), nil
}
return nil, fmt.Errorf("%w: cannot convert BinaryLiteral to %s, different length - %d <> %d",
ErrBadCast, typ, len(b), t.len)
case BinaryType:
return b, nil
}
return nil, fmt.Errorf("%w: BinaryLiteral to %s", ErrBadCast, typ)
}
func (b BinaryLiteral) Equals(other Literal) bool {
rhs, ok := other.(BinaryLiteral)
if !ok {
return false
}
return bytes.Equal([]byte(b), rhs)
}
func (b BinaryLiteral) MarshalBinary() (data []byte, err error) {
// stored directly as is
data = b
return
}
func (b *BinaryLiteral) UnmarshalBinary(data []byte) error {
// stored directly as is
*b = BinaryLiteral(data)
return nil
}
type FixedLiteral []byte
func (FixedLiteral) Comparator() Comparator[[]byte] { return bytes.Compare }
func (f FixedLiteral) Type() Type { return FixedTypeOf(len(f)) }
func (f FixedLiteral) Value() []byte { return []byte(f) }
func (f FixedLiteral) String() string { return string(f) }
func (f FixedLiteral) To(typ Type) (Literal, error) {
switch t := typ.(type) {
case UUIDType:
val, err := uuid.FromBytes(f)
if err != nil {
return nil, fmt.Errorf("%w: cannot convert FixedLiteral to UUID - %s",
ErrBadCast, err.Error())
}
return UUIDLiteral(val), nil
case FixedType:
if len(f) == t.len {
return FixedLiteral(f), nil
}
return nil, fmt.Errorf("%w: cannot convert FixedLiteral to %s, different length - %d <> %d",
ErrBadCast, typ, len(f), t.len)
case BinaryType:
return f, nil
}
return nil, fmt.Errorf("%w: FixedLiteral[%d] to %s",
ErrBadCast, len(f), typ)
}
func (f FixedLiteral) Equals(other Literal) bool {
rhs, ok := other.(FixedLiteral)
if !ok {
return false
}
return bytes.Equal([]byte(f), rhs)
}
func (f FixedLiteral) MarshalBinary() (data []byte, err error) {
// stored directly as is
data = f
return
}
func (f *FixedLiteral) UnmarshalBinary(data []byte) error {
// stored directly as is
*f = FixedLiteral(data)
return nil
}
type UUIDLiteral uuid.UUID
func (UUIDLiteral) Comparator() Comparator[uuid.UUID] {
return func(v1, v2 uuid.UUID) int {
return bytes.Compare(v1[:], v2[:])
}
}
func (UUIDLiteral) Type() Type { return PrimitiveTypes.UUID }
func (u UUIDLiteral) Value() uuid.UUID { return uuid.UUID(u) }
func (u UUIDLiteral) String() string { return uuid.UUID(u).String() }
func (u UUIDLiteral) To(typ Type) (Literal, error) {
switch t := typ.(type) {
case UUIDType: