chore: import upstream snapshot with attribution

2026-07-13 12:32:25 +08:00
commit e014feafe1
2285 changed files with 1131979 additions and 0 deletions
@@ -0,0 +1,94 @@
+// 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
+}