wehub-resource-sync
131 lines
4.8 KiB
Go
131 lines
4.8 KiB
Go
// Copyright 2024 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package types
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import (
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"github.com/dolthub/go-mysql-server/sql"
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"gopkg.in/src-d/go-errors.v1"
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"github.com/dolthub/doltgresql/utils"
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"github.com/dolthub/doltgresql/core/id"
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)
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const (
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// StringMaxLength is the maximum number of characters (not bytes) that a Char, VarChar, or BpChar may contain.
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StringMaxLength = 10485760
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// StringUnbounded is used to represent that a type does not define a limit on the strings that it accepts. Values
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// are still limited by the field size limit, but it won't be enforced by the type.
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StringUnbounded = 0
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)
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// ErrLengthMustBeAtLeast1 is returned when given character length is less than 1.
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var ErrLengthMustBeAtLeast1 = errors.NewKind(`length for type %s must be at least 1`)
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// ErrLengthCannotExceed is returned when given character length exceeds the upper bound, 10485760.
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var ErrLengthCannotExceed = errors.NewKind(`length for type %s cannot exceed 10485760`)
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// VarChar is a varchar that has an unbounded length.
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var VarChar = &DoltgresType{
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ID: toInternal("varchar"),
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TypLength: int16(-1),
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PassedByVal: false,
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TypType: TypeType_Base,
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TypCategory: TypeCategory_StringTypes,
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IsPreferred: false,
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IsDefined: true,
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Delimiter: ",",
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RelID: id.Null,
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SubscriptFunc: toFuncID("-"),
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Elem: internalNullType,
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Array: internalNullType,
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InputFunc: toFuncID("varcharin", toInternal("cstring"), toInternal("oid"), toInternal("int4")),
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OutputFunc: toFuncID("varcharout", toInternal("varchar")),
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ReceiveFunc: toFuncID("varcharrecv", toInternal("internal"), toInternal("oid"), toInternal("int4")),
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SendFunc: toFuncID("varcharsend", toInternal("varchar")),
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ModInFunc: toFuncID("varchartypmodin", toInternal("_cstring")),
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ModOutFunc: toFuncID("varchartypmodout", toInternal("int4")),
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AnalyzeFunc: toFuncID("-"),
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Align: TypeAlignment_Int,
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Storage: TypeStorage_Extended,
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NotNull: false,
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BaseTypeType: internalNullType,
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TypMod: -1,
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NDims: 0,
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TypCollation: id.NewCollation("pg_catalog", "default"),
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DefaulBin: "",
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Default: "",
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Acl: nil,
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Checks: nil,
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attTypMod: -1,
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CompareFunc: toFuncID("bttextcmp", toInternal("text"), toInternal("text")), // TODO: temporarily added
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SerializationFunc: serializeTypeVarChar,
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DeserializationFunc: deserializeTypeVarChar,
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}
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// NewVarCharType returns VarChar type with type modifier set
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// representing the maximum number of characters that the type may hold.
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func NewVarCharType(maxChars int32) (*DoltgresType, error) {
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typmod, err := GetTypModFromCharLength("varchar", maxChars)
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if err != nil {
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return nil, err
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}
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newType := *VarChar.WithAttTypMod(typmod)
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return &newType, nil
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}
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// MustCreateNewVarCharType panics if used with out-of-bound value.
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func MustCreateNewVarCharType(maxChars int32) *DoltgresType {
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newType, err := NewVarCharType(maxChars)
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if err != nil {
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panic(err)
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}
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return newType
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}
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// GetTypModFromCharLength takes character type and its length and returns the type modifier value.
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func GetTypModFromCharLength(typName string, l int32) (int32, error) {
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if l < 1 {
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return 0, ErrLengthMustBeAtLeast1.New(typName)
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} else if l > StringMaxLength {
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return 0, ErrLengthCannotExceed.New(typName)
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}
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return l + 4, nil
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}
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// GetCharLengthFromTypmod takes character type modifier and returns length value.
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func GetCharLengthFromTypmod(typmod int32) int32 {
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return typmod - 4
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}
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// serializeTypeVarChar handles serialization from the standard representation to our serialized representation that is
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// written in Dolt.
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func serializeTypeVarChar(ctx *sql.Context, t *DoltgresType, val any) ([]byte, error) {
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str := val.(string)
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writer := utils.NewWriter(uint64(len(str) + 4))
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writer.String(str)
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return writer.Data(), nil
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}
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// deserializeTypeVarChar handles deserialization from the Dolt serialized format to our standard representation used by
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// expressions and nodes.
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func deserializeTypeVarChar(ctx *sql.Context, t *DoltgresType, data []byte) (any, error) {
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if len(data) == 0 {
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return nil, nil
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}
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reader := utils.NewReader(data)
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return reader.String(), nil
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}
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