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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.
//go:build go1.18
package exprs
import (
"encoding/json"
"fmt"
"reflect"
"strings"
"github.com/apache/arrow-go/v18/arrow"
"github.com/apache/arrow-go/v18/arrow/array"
)
type simpleExtensionTypeFactory[P comparable] struct {
arrow.ExtensionBase
params P
name string
getStorage func(P) arrow.DataType
}
func (ef *simpleExtensionTypeFactory[P]) String() string { return "extension<" + ef.Serialize() + ">" }
func (ef *simpleExtensionTypeFactory[P]) ExtensionName() string { return ef.name }
func (ef *simpleExtensionTypeFactory[P]) Serialize() string {
s, _ := json.Marshal(ef.params)
return ef.name + string(s)
}
func (ef *simpleExtensionTypeFactory[P]) Deserialize(storage arrow.DataType, data string) (arrow.ExtensionType, error) {
if !strings.HasPrefix(data, ef.name) {
return nil, fmt.Errorf("%w: invalid deserialization of extension type %s", arrow.ErrInvalid, ef.name)
}
data = strings.TrimPrefix(data, ef.name)
if err := json.Unmarshal([]byte(data), &ef.params); err != nil {
return nil, fmt.Errorf("%w: failed parsing parameters for extension type", err)
}
if !arrow.TypeEqual(storage, ef.getStorage(ef.params)) {
return nil, fmt.Errorf("%w: invalid storage type for %s: %s (expected: %s)",
arrow.ErrInvalid, ef.name, storage, ef.getStorage(ef.params))
}
return &simpleExtensionTypeFactory[P]{
name: ef.name,
params: ef.params,
getStorage: ef.getStorage,
ExtensionBase: arrow.ExtensionBase{
Storage: storage,
},
}, nil
}
func (ef *simpleExtensionTypeFactory[P]) ExtensionEquals(other arrow.ExtensionType) bool {
if ef.name != other.ExtensionName() {
return false
}
rhs := other.(*simpleExtensionTypeFactory[P])
return ef.params == rhs.params
}
func (ef *simpleExtensionTypeFactory[P]) ArrayType() reflect.Type {
return reflect.TypeOf(simpleExtensionArrayFactory[P]{})
}
func (ef *simpleExtensionTypeFactory[P]) CreateType(params P) arrow.DataType {
storage := ef.getStorage(params)
return &simpleExtensionTypeFactory[P]{
name: ef.name,
params: params,
getStorage: ef.getStorage,
ExtensionBase: arrow.ExtensionBase{
Storage: storage,
},
}
}
type simpleExtensionArrayFactory[P comparable] struct {
array.ExtensionArrayBase
}
type uuidExtParams struct{}
var uuidType = simpleExtensionTypeFactory[uuidExtParams]{
name: "arrow.uuid", getStorage: func(uuidExtParams) arrow.DataType {
return &arrow.FixedSizeBinaryType{ByteWidth: 16}
}}
type fixedCharExtensionParams struct {
Length int32 `json:"length"`
}
var fixedCharType = simpleExtensionTypeFactory[fixedCharExtensionParams]{
name: "fixed_char", getStorage: func(p fixedCharExtensionParams) arrow.DataType {
return &arrow.FixedSizeBinaryType{ByteWidth: int(p.Length)}
},
}
type varCharExtensionParams struct {
Length int32 `json:"length"`
}
var varCharType = simpleExtensionTypeFactory[varCharExtensionParams]{
name: "varchar", getStorage: func(varCharExtensionParams) arrow.DataType {
return arrow.BinaryTypes.String
},
}
type intervalYearExtensionParams struct{}
var intervalYearType = simpleExtensionTypeFactory[intervalYearExtensionParams]{
name: "interval_year", getStorage: func(intervalYearExtensionParams) arrow.DataType {
return arrow.FixedSizeListOf(2, arrow.PrimitiveTypes.Int32)
},
}
type intervalDayExtensionParams struct{}
var intervalDayType = simpleExtensionTypeFactory[intervalDayExtensionParams]{
name: "interval_day", getStorage: func(intervalDayExtensionParams) arrow.DataType {
return arrow.FixedSizeListOf(2, arrow.PrimitiveTypes.Int32)
},
}
func uuid() arrow.DataType { return uuidType.CreateType(uuidExtParams{}) }
func fixedChar(length int32) arrow.DataType {
return fixedCharType.CreateType(fixedCharExtensionParams{Length: length})
}
func varChar(length int32) arrow.DataType {
return varCharType.CreateType(varCharExtensionParams{Length: length})
}
func intervalYear() arrow.DataType {
return intervalYearType.CreateType(intervalYearExtensionParams{})
}
func intervalDay() arrow.DataType {
return intervalDayType.CreateType(intervalDayExtensionParams{})
}
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