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array.go
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array.go
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// Licensed to ClickHouse, Inc. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. ClickHouse, Inc. 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.
package column
import (
"fmt"
"github.com/ClickHouse/ch-go/proto"
"reflect"
"strings"
"time"
)
type offset struct {
values UInt64
scanType reflect.Type
}
type Array struct {
depth int
chType Type
values Interface
offsets []*offset
scanType reflect.Type
name string
}
func (col *Array) Reset() {
col.values.Reset()
for i := range col.offsets {
col.offsets[i].values.Reset()
}
}
func (col *Array) Name() string {
return col.name
}
func (col *Array) parse(t Type, tz *time.Location) (_ *Array, err error) {
col.chType = t
var typeStr = string(t)
parse:
for {
switch {
case strings.HasPrefix(typeStr, "Array("):
col.depth++
typeStr = strings.TrimPrefix(typeStr, "Array(")
typeStr = strings.TrimSuffix(typeStr, ")")
default:
break parse
}
}
if col.depth != 0 {
if col.values, err = Type(typeStr).Column(col.name, tz); err != nil {
return nil, err
}
offsetScanTypes := make([]reflect.Type, 0, col.depth)
col.offsets, col.scanType = make([]*offset, 0, col.depth), col.values.ScanType()
for i := 0; i < col.depth; i++ {
col.scanType = reflect.SliceOf(col.scanType)
offsetScanTypes = append(offsetScanTypes, col.scanType)
}
for i := len(offsetScanTypes) - 1; i >= 0; i-- {
col.offsets = append(col.offsets, &offset{
scanType: offsetScanTypes[i],
})
}
return col, nil
}
return nil, &UnsupportedColumnTypeError{
t: t,
}
}
func (col *Array) Base() Interface {
return col.values
}
func (col *Array) Type() Type {
return col.chType
}
func (col *Array) ScanType() reflect.Type {
return col.scanType
}
func (col *Array) Rows() int {
if len(col.offsets) != 0 {
return col.offsets[0].values.Rows()
}
return 0
}
func (col *Array) Row(i int, ptr bool) any {
value, err := col.scan(col.ScanType(), i)
if err != nil {
fmt.Println(err)
}
return value.Interface()
}
func (col *Array) Append(v any) (nulls []uint8, err error) {
value := reflect.Indirect(reflect.ValueOf(v))
if value.Kind() != reflect.Slice {
return nil, &ColumnConverterError{
Op: "Append",
To: string(col.chType),
From: fmt.Sprintf("%T", v),
Hint: "value must be a slice",
}
}
for i := 0; i < value.Len(); i++ {
if err := col.AppendRow(value.Index(i)); err != nil {
return nil, err
}
}
return
}
func (col *Array) AppendRow(v any) error {
if col.depth == 1 {
// try to use reflection-free method.
return col.appendRowPlain(v)
}
return col.appendRowDefault(v)
}
func (col *Array) appendRowDefault(v any) error {
var elem reflect.Value
switch v := v.(type) {
case reflect.Value:
elem = reflect.Indirect(v)
default:
elem = reflect.Indirect(reflect.ValueOf(v))
}
if !elem.IsValid() {
from := fmt.Sprintf("%T", v)
if !elem.IsValid() {
from = fmt.Sprintf("%v", v)
}
return &ColumnConverterError{
Op: "AppendRow",
To: string(col.chType),
From: from,
Hint: fmt.Sprintf("try using %s", col.scanType),
}
}
return col.append(elem, 0)
}
func appendRowPlain[T any](col *Array, arr []T) error {
col.appendOffset(0, uint64(len(arr)))
for _, item := range arr {
if err := col.values.AppendRow(item); err != nil {
return err
}
}
return nil
}
func appendNullableRowPlain[T any](col *Array, arr []*T) error {
col.appendOffset(0, uint64(len(arr)))
for _, item := range arr {
var err error
if item == nil {
err = col.values.AppendRow(nil)
} else {
err = col.values.AppendRow(item)
}
if err != nil {
return err
}
}
return nil
}
func (col *Array) append(elem reflect.Value, level int) error {
if level < col.depth {
switch elem.Kind() {
// reflect.Value.Len() & reflect.Value.Index() is called in `append` method which is only valid for
// Slice, Array and String that make sense here.
case reflect.Slice, reflect.Array, reflect.String:
col.appendOffset(level, uint64(elem.Len()))
for i := 0; i < elem.Len(); i++ {
if err := col.append(elem.Index(i), level+1); err != nil {
return err
}
}
return nil
}
return &ColumnConverterError{
Op: "AppendRow",
To: "Array",
From: fmt.Sprintf("%T", elem),
}
}
if elem.Kind() == reflect.Ptr && elem.IsNil() {
return col.values.AppendRow(nil)
}
return col.values.AppendRow(elem.Interface())
}
func (col *Array) appendOffset(level int, offset uint64) {
if ln := col.offsets[level].values.Rows(); ln != 0 {
offset += col.offsets[level].values.col.Row(ln - 1)
}
col.offsets[level].values.col.Append(offset)
}
func (col *Array) Decode(reader *proto.Reader, rows int) error {
for _, offset := range col.offsets {
if err := offset.values.col.DecodeColumn(reader, rows); err != nil {
return err
}
switch {
case offset.values.Rows() > 0:
rows = int(offset.values.col.Row(offset.values.col.Rows() - 1))
default:
rows = 0
}
}
return col.values.Decode(reader, rows)
}
func (col *Array) Encode(buffer *proto.Buffer) {
for _, offset := range col.offsets {
offset.values.col.EncodeColumn(buffer)
}
col.values.Encode(buffer)
}
func (col *Array) ReadStatePrefix(reader *proto.Reader) error {
if serialize, ok := col.values.(CustomSerialization); ok {
if err := serialize.ReadStatePrefix(reader); err != nil {
return err
}
}
return nil
}
func (col *Array) WriteStatePrefix(buffer *proto.Buffer) error {
if serialize, ok := col.values.(CustomSerialization); ok {
if err := serialize.WriteStatePrefix(buffer); err != nil {
return err
}
}
return nil
}
func (col *Array) ScanRow(dest any, row int) error {
elem := reflect.Indirect(reflect.ValueOf(dest))
value, err := col.scan(elem.Type(), row)
if err != nil {
return err
}
elem.Set(value)
return nil
}
func (col *Array) scan(sliceType reflect.Type, row int) (reflect.Value, error) {
switch col.values.(type) {
case *Tuple:
subSlice, err := col.scanSliceOfObjects(sliceType, row)
if err != nil {
return reflect.Value{}, err
}
return subSlice, nil
default:
subSlice, err := col.scanSlice(sliceType, row, 0)
if err != nil {
return reflect.Value{}, err
}
return subSlice, nil
}
}
func (col *Array) scanSlice(sliceType reflect.Type, row int, level int) (reflect.Value, error) {
// We could try and set - if it exceeds just return immediately
offset := col.offsets[level]
var (
end = offset.values.col.Row(row)
start = uint64(0)
)
if row > 0 {
start = offset.values.col.Row(row - 1)
}
base := offset.scanType.Elem()
isPtr := base.Kind() == reflect.Ptr
var rSlice reflect.Value
switch sliceType.Kind() {
case reflect.Interface:
sliceType = offset.scanType
rSlice = reflect.MakeSlice(sliceType, 0, int(end-start))
case reflect.Slice:
rSlice = reflect.MakeSlice(sliceType, 0, int(end-start))
default:
return reflect.Value{}, &Error{
ColumnType: fmt.Sprint(sliceType.Kind()),
Err: fmt.Errorf("column %s - needs a slice or any", col.Name()),
}
}
for i := start; i < end; i++ {
var value reflect.Value
var err error
switch {
case level == len(col.offsets)-1:
switch dcol := col.values.(type) {
case *Nested:
//Array(Nested
aCol := dcol.Interface.(*Array)
value, err = aCol.scanSliceOfObjects(sliceType.Elem(), int(i))
if err != nil {
return reflect.Value{}, err
}
case *Array:
//Array(Array
value, err = dcol.scanSlice(sliceType.Elem(), int(i), 0)
if err != nil {
return reflect.Value{}, err
}
case *Tuple:
// Array(Tuple possible outside JSON object cases e.g. if the user defines a Array(Array( Tuple(String, Int64) ))
value, err = dcol.scan(sliceType.Elem(), int(i))
if err != nil {
return reflect.Value{}, err
}
default:
v := col.values.Row(int(i), isPtr)
val := reflect.ValueOf(v)
if v == nil {
val = reflect.Zero(base)
}
if sliceType.Kind() == reflect.Interface {
value = reflect.New(sliceType).Elem()
if err := setJSONFieldValue(value, val); err != nil {
return reflect.Value{}, err
}
} else {
value = reflect.New(sliceType.Elem()).Elem()
if err := setJSONFieldValue(value, val); err != nil {
return reflect.Value{}, err
}
}
}
default:
value, err = col.scanSlice(sliceType.Elem(), int(i), level+1)
if err != nil {
return reflect.Value{}, err
}
}
rSlice = reflect.Append(rSlice, value)
}
return rSlice, nil
}
func (col *Array) scanSliceOfObjects(sliceType reflect.Type, row int) (reflect.Value, error) {
if sliceType.Kind() == reflect.Interface {
// catches any - Note this swallows custom interfaces to which maps couldn't conform
subMap := make(map[string]any)
return col.scanSliceOfMaps(reflect.SliceOf(reflect.TypeOf(subMap)), row)
} else if sliceType.Kind() == reflect.Slice {
// make a slice of the right type - we need this to be a slice of a type capable of taking an object as nested
switch sliceType.Elem().Kind() {
case reflect.Struct:
return col.scanSliceOfStructs(sliceType, row)
case reflect.Map:
return col.scanSliceOfMaps(sliceType, row)
case reflect.Slice:
// tuples can be read as arrays
return col.scanSlice(sliceType, row, 0)
case reflect.Interface:
// catches []any - Note this swallows custom interfaces to which maps could never conform
subMap := make(map[string]any)
return col.scanSliceOfMaps(reflect.SliceOf(reflect.TypeOf(subMap)), row)
default:
return reflect.Value{}, &Error{
ColumnType: fmt.Sprint(sliceType.Elem().Kind()),
Err: fmt.Errorf("column %s - needs a slice of objects or an any", col.Name()),
}
}
}
return reflect.Value{}, &Error{
ColumnType: fmt.Sprint(sliceType.Kind()),
Err: fmt.Errorf("column %s - needs a slice or any", col.Name()),
}
}
// the following 2 functions can probably be refactored - the share alot of common code for structs and maps
func (col *Array) scanSliceOfMaps(sliceType reflect.Type, row int) (reflect.Value, error) {
if sliceType.Kind() != reflect.Slice {
return reflect.Value{}, &ColumnConverterError{
Op: "ScanRow",
To: sliceType.String(),
From: string(col.Type()),
}
}
tCol, ok := col.values.(*Tuple)
if !ok {
return reflect.Value{}, &Error{
ColumnType: fmt.Sprint(col.values.Type()),
Err: fmt.Errorf("column %s - must be a tuple", col.Name()),
}
}
// Array(Tuple so depth 1 for JSON
offset := col.offsets[0]
var (
end = offset.values.col.Row(row)
start = uint64(0)
)
if row > 0 {
start = offset.values.col.Row(row - 1)
}
if end-start > 0 {
rSlice := reflect.MakeSlice(sliceType, 0, int(end-start))
for i := start; i < end; i++ {
sMap := reflect.MakeMap(sliceType.Elem())
if err := tCol.scanMap(sMap, int(i)); err != nil {
return reflect.Value{}, err
}
rSlice = reflect.Append(rSlice, sMap)
}
return rSlice, nil
}
return reflect.MakeSlice(sliceType, 0, 0), nil
}
func (col *Array) scanSliceOfStructs(sliceType reflect.Type, row int) (reflect.Value, error) {
if sliceType.Kind() != reflect.Slice {
return reflect.Value{}, &ColumnConverterError{
Op: "ScanRow",
To: sliceType.String(),
From: string(col.Type()),
}
}
tCol, ok := col.values.(*Tuple)
if !ok {
return reflect.Value{}, &Error{
ColumnType: fmt.Sprint(col.values.Type()),
Err: fmt.Errorf("column %s - must be a tuple", col.Name()),
}
}
// Array(Tuple so depth 1 for JSON
offset := col.offsets[0]
var (
end = offset.values.col.Row(row)
start = uint64(0)
)
if row > 0 {
start = offset.values.col.Row(row - 1)
}
if end-start > 0 {
// create a slice of the type from the sliceType - if this might be any as its driven by the target datastructure
rSlice := reflect.MakeSlice(sliceType, 0, int(end-start))
for i := start; i < end; i++ {
sStruct := reflect.New(sliceType.Elem()).Elem()
if err := tCol.scanStruct(sStruct, int(i)); err != nil {
return reflect.Value{}, err
}
rSlice = reflect.Append(rSlice, sStruct)
}
return rSlice, nil
}
return reflect.MakeSlice(sliceType, 0, 0), nil
}
var (
_ Interface = (*Array)(nil)
_ CustomSerialization = (*Array)(nil)
)