wehub-resource-sync
95 lines
3.2 KiB
Go
95 lines
3.2 KiB
Go
// 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 (
|
|
"encoding/binary"
|
|
"math"
|
|
|
|
"github.com/dolthub/go-mysql-server/sql"
|
|
|
|
"github.com/dolthub/doltgresql/core/id"
|
|
)
|
|
|
|
// Float64 is a float64.
|
|
var Float64 = &DoltgresType{
|
|
ID: toInternal("float8"),
|
|
TypLength: int16(8),
|
|
PassedByVal: true,
|
|
TypType: TypeType_Base,
|
|
TypCategory: TypeCategory_NumericTypes,
|
|
IsPreferred: true,
|
|
IsDefined: true,
|
|
Delimiter: ",",
|
|
RelID: id.Null,
|
|
SubscriptFunc: toFuncID("-"),
|
|
Elem: internalNullType,
|
|
Array: internalNullType,
|
|
InputFunc: toFuncID("float8in", toInternal("cstring")),
|
|
OutputFunc: toFuncID("float8out", toInternal("float8")),
|
|
ReceiveFunc: toFuncID("float8recv", toInternal("internal")),
|
|
SendFunc: toFuncID("float8send", toInternal("float8")),
|
|
ModInFunc: toFuncID("-"),
|
|
ModOutFunc: toFuncID("-"),
|
|
AnalyzeFunc: toFuncID("-"),
|
|
Align: TypeAlignment_Double,
|
|
Storage: TypeStorage_Plain,
|
|
NotNull: false,
|
|
BaseTypeType: internalNullType,
|
|
TypMod: -1,
|
|
NDims: 0,
|
|
TypCollation: id.NullCollation,
|
|
DefaulBin: "",
|
|
Default: "",
|
|
Acl: nil,
|
|
Checks: nil,
|
|
attTypMod: -1,
|
|
CompareFunc: toFuncID("btfloat8cmp", toInternal("float8"), toInternal("float8")),
|
|
InternalName: "double precision",
|
|
SerializationFunc: serializeTypeFloat64,
|
|
DeserializationFunc: deserializeTypeFloat64,
|
|
}
|
|
|
|
// serializeTypeFloat64 handles serialization from the standard representation to our serialized representation that is
|
|
// written in Dolt.
|
|
func serializeTypeFloat64(ctx *sql.Context, t *DoltgresType, val any) ([]byte, error) {
|
|
f64 := val.(float64)
|
|
retVal := make([]byte, 8)
|
|
// Make the serialized form trivially comparable using bytes.Compare: https://stackoverflow.com/a/54557561
|
|
unsignedBits := math.Float64bits(f64)
|
|
if f64 >= 0 {
|
|
unsignedBits ^= 1 << 63
|
|
} else {
|
|
unsignedBits = ^unsignedBits
|
|
}
|
|
binary.BigEndian.PutUint64(retVal, unsignedBits)
|
|
return retVal, nil
|
|
}
|
|
|
|
// deserializeTypeFloat64 handles deserialization from the Dolt serialized format to our standard representation used by
|
|
// expressions and nodes.
|
|
func deserializeTypeFloat64(ctx *sql.Context, t *DoltgresType, data []byte) (any, error) {
|
|
if len(data) == 0 {
|
|
return nil, nil
|
|
}
|
|
unsignedBits := binary.BigEndian.Uint64(data)
|
|
if unsignedBits&(1<<63) != 0 {
|
|
unsignedBits ^= 1 << 63
|
|
} else {
|
|
unsignedBits = ^unsignedBits
|
|
}
|
|
return math.Float64frombits(unsignedBits), nil
|
|
}
|