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numeric.go
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/
numeric.go
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// Copyright 2024 Dolthub, Inc.
//
// Licensed 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 types
import (
"bytes"
"encoding/binary"
"fmt"
"math/big"
"reflect"
"github.com/lib/pq/oid"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/types"
"github.com/dolthub/vitess/go/sqltypes"
"github.com/dolthub/vitess/go/vt/proto/query"
"github.com/shopspring/decimal"
)
const (
MaxUint32 = 4294967295 // MaxUint32 is the largest possible value of Uint32
MinInt32 = -2147483648 // MinInt32 is the smallest possible value of Int32
)
var (
NumericValueMaxInt16 = decimal.NewFromInt(32767) // NumericValueMaxInt16 is the max Int16 value for NUMERIC types
NumericValueMaxInt32 = decimal.NewFromInt(2147483647) // NumericValueMaxInt32 is the max Int32 value for NUMERIC types
NumericValueMaxInt64 = decimal.NewFromInt(9223372036854775807) // NumericValueMaxInt64 is the max Int64 value for NUMERIC types
NumericValueMinInt16 = decimal.NewFromInt(-32768) // NumericValueMinInt16 is the min Int16 value for NUMERIC types
NumericValueMinInt32 = decimal.NewFromInt(MinInt32) // NumericValueMinInt32 is the min Int32 value for NUMERIC types
NumericValueMinInt64 = decimal.NewFromInt(-9223372036854775808) // NumericValueMinInt64 is the min Int64 value for NUMERIC types
NumericValueMaxUint32 = decimal.NewFromInt(MaxUint32) // NumericValueMaxUint32 is the max Uint32 value for NUMERIC types
)
// Numeric is a precise and unbounded decimal value.
var Numeric = NumericType{-1, -1}
// NumericType is the extended type implementation of the PostgreSQL numeric.
type NumericType struct {
// TODO: implement precision and scale
Precision int32
Scale int32
}
var _ DoltgresType = NumericType{}
// BaseID implements the DoltgresType interface.
func (b NumericType) BaseID() DoltgresTypeBaseID {
return DoltgresTypeBaseID_Numeric
}
// CollationCoercibility implements the DoltgresType interface.
func (b NumericType) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 5
}
// Compare implements the DoltgresType interface.
func (b NumericType) Compare(v1 any, v2 any) (int, error) {
if v1 == nil && v2 == nil {
return 0, nil
} else if v1 != nil && v2 == nil {
return 1, nil
} else if v1 == nil && v2 != nil {
return -1, nil
}
ac, _, err := b.Convert(v1)
if err != nil {
return 0, err
}
bc, _, err := b.Convert(v2)
if err != nil {
return 0, err
}
ab := ac.(decimal.Decimal)
bb := bc.(decimal.Decimal)
return ab.Cmp(bb), nil
}
// Convert implements the DoltgresType interface.
func (b NumericType) Convert(val any) (any, sql.ConvertInRange, error) {
switch val := val.(type) {
case bool:
if val {
return decimal.NewFromInt(1), sql.InRange, nil
}
return decimal.NewFromInt(0), sql.InRange, nil
case int:
return decimal.NewFromInt(int64(val)), sql.InRange, nil
case uint:
return decimal.NewFromInt(int64(val)), sql.InRange, nil
case int8:
return decimal.NewFromInt(int64(val)), sql.InRange, nil
case uint8:
return decimal.NewFromInt(int64(val)), sql.InRange, nil
case int16:
return decimal.NewFromInt(int64(val)), sql.InRange, nil
case uint16:
return decimal.NewFromInt(int64(val)), sql.InRange, nil
case int32:
return decimal.NewFromInt(int64(val)), sql.InRange, nil
case uint32:
return decimal.NewFromInt(int64(val)), sql.InRange, nil
case int64:
return decimal.NewFromInt(val), sql.InRange, nil
case uint64:
return decimal.NewFromBigInt(new(big.Int).SetUint64(val), 1), sql.InRange, nil
case float32:
return decimal.NewFromFloat(float64(val)), sql.InRange, nil
case float64:
return decimal.NewFromFloat(val), sql.InRange, nil
case decimal.NullDecimal:
if !val.Valid {
return nil, sql.InRange, nil
}
return val.Decimal, sql.InRange, nil
case decimal.Decimal:
return val, sql.InRange, nil
case string:
d, err := decimal.NewFromString(val)
return d, sql.InRange, err
case []byte:
return b.Convert(string(val))
case nil:
return nil, sql.InRange, nil
default:
return nil, sql.OutOfRange, fmt.Errorf("%s: unhandled type: %T", b.String(), val)
}
}
// Equals implements the DoltgresType interface.
func (b NumericType) Equals(otherType sql.Type) bool {
if otherExtendedType, ok := otherType.(types.ExtendedType); ok {
return bytes.Equal(MustSerializeType(b), MustSerializeType(otherExtendedType))
}
return false
}
// FormatSerializedValue implements the DoltgresType interface.
func (b NumericType) FormatSerializedValue(val []byte) (string, error) {
deserialized, err := b.DeserializeValue(val)
if err != nil {
return "", err
}
return b.FormatValue(deserialized)
}
// FormatValue implements the DoltgresType interface.
func (b NumericType) FormatValue(val any) (string, error) {
if val == nil {
return "", nil
}
converted, _, err := b.Convert(val)
if err != nil {
return "", err
}
return converted.(decimal.Decimal).String(), nil
}
// GetSerializationID implements the DoltgresType interface.
func (b NumericType) GetSerializationID() SerializationID {
return SerializationID_Numeric
}
// IsUnbounded implements the DoltgresType interface.
func (b NumericType) IsUnbounded() bool {
return false
}
// MaxSerializedWidth implements the DoltgresType interface.
func (b NumericType) MaxSerializedWidth() types.ExtendedTypeSerializedWidth {
return types.ExtendedTypeSerializedWidth_Unbounded
}
// MaxTextResponseByteLength implements the DoltgresType interface.
func (b NumericType) MaxTextResponseByteLength(ctx *sql.Context) uint32 {
return 65535
}
// OID implements the DoltgresType interface.
func (b NumericType) OID() uint32 {
return uint32(oid.T_numeric)
}
// Promote implements the DoltgresType interface.
func (b NumericType) Promote() sql.Type {
return b
}
// SerializedCompare implements the DoltgresType interface.
func (b NumericType) SerializedCompare(v1 []byte, v2 []byte) (int, error) {
if len(v1) == 0 && len(v2) == 0 {
return 0, nil
} else if len(v1) > 0 && len(v2) == 0 {
return 1, nil
} else if len(v1) == 0 && len(v2) > 0 {
return -1, nil
}
ac, err := b.DeserializeValue(v1)
if err != nil {
return 0, err
}
bc, err := b.DeserializeValue(v2)
if err != nil {
return 0, err
}
ab := ac.(decimal.Decimal)
bb := bc.(decimal.Decimal)
return ab.Cmp(bb), nil
}
// SQL implements the DoltgresType interface.
func (b NumericType) SQL(ctx *sql.Context, dest []byte, v any) (sqltypes.Value, error) {
if v == nil {
return sqltypes.NULL, nil
}
value, err := b.FormatValue(v)
if err != nil {
return sqltypes.Value{}, err
}
return sqltypes.MakeTrusted(sqltypes.VarChar, types.AppendAndSliceBytes(dest, []byte(value))), nil
}
// String implements the DoltgresType interface.
func (b NumericType) String() string {
return "numeric"
}
// ToArrayType implements the DoltgresType interface.
func (b NumericType) ToArrayType() DoltgresArrayType {
return NumericArray
}
// Type implements the DoltgresType interface.
func (b NumericType) Type() query.Type {
return sqltypes.Decimal
}
// ValueType implements the DoltgresType interface.
func (b NumericType) ValueType() reflect.Type {
return reflect.TypeOf(decimal.Zero)
}
// Zero implements the DoltgresType interface.
func (b NumericType) Zero() any {
return decimal.Zero
}
// SerializeType implements the DoltgresType interface.
func (b NumericType) SerializeType() ([]byte, error) {
t := make([]byte, serializationIDHeaderSize+8)
copy(t, SerializationID_Numeric.ToByteSlice(0))
binary.LittleEndian.PutUint32(t[serializationIDHeaderSize:], uint32(b.Precision))
binary.LittleEndian.PutUint32(t[serializationIDHeaderSize+4:], uint32(b.Scale))
return t, nil
}
// deserializeType implements the DoltgresType interface.
func (b NumericType) deserializeType(version uint16, metadata []byte) (DoltgresType, error) {
switch version {
case 0:
return NumericType{
Precision: int32(binary.LittleEndian.Uint32(metadata)),
Scale: int32(binary.LittleEndian.Uint32(metadata[4:])),
}, nil
default:
return nil, fmt.Errorf("version %d is not yet supported for %s", version, b.String())
}
}
// SerializeValue implements the DoltgresType interface.
func (b NumericType) SerializeValue(val any) ([]byte, error) {
if val == nil {
return nil, nil
}
converted, _, err := b.Convert(val)
if err != nil {
return nil, err
}
return converted.(decimal.Decimal).MarshalBinary()
}
// DeserializeValue implements the DoltgresType interface.
func (b NumericType) DeserializeValue(val []byte) (any, error) {
if len(val) == 0 {
return nil, nil
}
retVal := decimal.NewFromInt(0)
err := retVal.UnmarshalBinary(val)
return retVal, err
}