/
metadata.go
1287 lines (1091 loc) · 37.2 KB
/
metadata.go
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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.
package ipc
import (
"encoding/binary"
"errors"
"fmt"
"io"
"sort"
"github.com/apache/arrow/go/v14/arrow"
"github.com/apache/arrow/go/v14/arrow/endian"
"github.com/apache/arrow/go/v14/arrow/internal/dictutils"
"github.com/apache/arrow/go/v14/arrow/internal/flatbuf"
"github.com/apache/arrow/go/v14/arrow/memory"
flatbuffers "github.com/google/flatbuffers/go"
)
// Magic string identifying an Apache Arrow file.
var Magic = []byte("ARROW1")
const (
currentMetadataVersion = MetadataV5
minMetadataVersion = MetadataV4
// constants for the extension type metadata keys for the type name and
// any extension metadata to be passed to deserialize.
ExtensionTypeKeyName = "ARROW:extension:name"
ExtensionMetadataKeyName = "ARROW:extension:metadata"
// ARROW-109: We set this number arbitrarily to help catch user mistakes. For
// deeply nested schemas, it is expected the user will indicate explicitly the
// maximum allowed recursion depth
kMaxNestingDepth = 64
)
type startVecFunc func(b *flatbuffers.Builder, n int) flatbuffers.UOffsetT
type fieldMetadata struct {
Len int64
Nulls int64
Offset int64
}
type bufferMetadata struct {
Offset int64 // relative offset into the memory page to the starting byte of the buffer
Len int64 // absolute length in bytes of the buffer
}
type fileBlock struct {
Offset int64
Meta int32
Body int64
r io.ReaderAt
mem memory.Allocator
}
func fileBlocksToFB(b *flatbuffers.Builder, blocks []fileBlock, start startVecFunc) flatbuffers.UOffsetT {
start(b, len(blocks))
for i := len(blocks) - 1; i >= 0; i-- {
blk := blocks[i]
flatbuf.CreateBlock(b, blk.Offset, blk.Meta, blk.Body)
}
return b.EndVector(len(blocks))
}
func (blk fileBlock) NewMessage() (*Message, error) {
var (
err error
buf []byte
body *memory.Buffer
meta *memory.Buffer
r = blk.section()
)
meta = memory.NewResizableBuffer(blk.mem)
meta.Resize(int(blk.Meta))
defer meta.Release()
buf = meta.Bytes()
_, err = io.ReadFull(r, buf)
if err != nil {
return nil, fmt.Errorf("arrow/ipc: could not read message metadata: %w", err)
}
prefix := 0
switch binary.LittleEndian.Uint32(buf) {
case 0:
case kIPCContToken:
prefix = 8
default:
// ARROW-6314: backwards compatibility for reading old IPC
// messages produced prior to version 0.15.0
prefix = 4
}
// drop buf-size already known from blk.Meta
meta = memory.SliceBuffer(meta, prefix, int(blk.Meta)-prefix)
defer meta.Release()
body = memory.NewResizableBuffer(blk.mem)
defer body.Release()
body.Resize(int(blk.Body))
buf = body.Bytes()
_, err = io.ReadFull(r, buf)
if err != nil {
return nil, fmt.Errorf("arrow/ipc: could not read message body: %w", err)
}
return NewMessage(meta, body), nil
}
func (blk fileBlock) section() io.Reader {
return io.NewSectionReader(blk.r, blk.Offset, int64(blk.Meta)+blk.Body)
}
func unitFromFB(unit flatbuf.TimeUnit) arrow.TimeUnit {
switch unit {
case flatbuf.TimeUnitSECOND:
return arrow.Second
case flatbuf.TimeUnitMILLISECOND:
return arrow.Millisecond
case flatbuf.TimeUnitMICROSECOND:
return arrow.Microsecond
case flatbuf.TimeUnitNANOSECOND:
return arrow.Nanosecond
default:
panic(fmt.Errorf("arrow/ipc: invalid flatbuf.TimeUnit(%d) value", unit))
}
}
func unitToFB(unit arrow.TimeUnit) flatbuf.TimeUnit {
switch unit {
case arrow.Second:
return flatbuf.TimeUnitSECOND
case arrow.Millisecond:
return flatbuf.TimeUnitMILLISECOND
case arrow.Microsecond:
return flatbuf.TimeUnitMICROSECOND
case arrow.Nanosecond:
return flatbuf.TimeUnitNANOSECOND
default:
panic(fmt.Errorf("arrow/ipc: invalid arrow.TimeUnit(%d) value", unit))
}
}
// initFB is a helper function to handle flatbuffers' polymorphism.
func initFB(t interface {
Table() flatbuffers.Table
Init([]byte, flatbuffers.UOffsetT)
}, f func(tbl *flatbuffers.Table) bool) {
tbl := t.Table()
if !f(&tbl) {
panic(fmt.Errorf("arrow/ipc: could not initialize %T from flatbuffer", t))
}
t.Init(tbl.Bytes, tbl.Pos)
}
func fieldFromFB(field *flatbuf.Field, pos dictutils.FieldPos, memo *dictutils.Memo) (arrow.Field, error) {
var (
err error
o arrow.Field
)
o.Name = string(field.Name())
o.Nullable = field.Nullable()
o.Metadata, err = metadataFromFB(field)
if err != nil {
return o, err
}
n := field.ChildrenLength()
children := make([]arrow.Field, n)
for i := range children {
var childFB flatbuf.Field
if !field.Children(&childFB, i) {
return o, fmt.Errorf("arrow/ipc: could not load field child %d", i)
}
child, err := fieldFromFB(&childFB, pos.Child(int32(i)), memo)
if err != nil {
return o, fmt.Errorf("arrow/ipc: could not convert field child %d: %w", i, err)
}
children[i] = child
}
o.Type, err = typeFromFB(field, pos, children, &o.Metadata, memo)
if err != nil {
return o, fmt.Errorf("arrow/ipc: could not convert field type: %w", err)
}
return o, nil
}
func fieldToFB(b *flatbuffers.Builder, pos dictutils.FieldPos, field arrow.Field, memo *dictutils.Mapper) flatbuffers.UOffsetT {
var visitor = fieldVisitor{b: b, memo: memo, pos: pos, meta: make(map[string]string)}
return visitor.result(field)
}
type fieldVisitor struct {
b *flatbuffers.Builder
memo *dictutils.Mapper
pos dictutils.FieldPos
dtype flatbuf.Type
offset flatbuffers.UOffsetT
kids []flatbuffers.UOffsetT
meta map[string]string
}
func (fv *fieldVisitor) visit(field arrow.Field) {
dt := field.Type
switch dt := dt.(type) {
case *arrow.NullType:
fv.dtype = flatbuf.TypeNull
flatbuf.NullStart(fv.b)
fv.offset = flatbuf.NullEnd(fv.b)
case *arrow.BooleanType:
fv.dtype = flatbuf.TypeBool
flatbuf.BoolStart(fv.b)
fv.offset = flatbuf.BoolEnd(fv.b)
case *arrow.Uint8Type:
fv.dtype = flatbuf.TypeInt
fv.offset = intToFB(fv.b, int32(dt.BitWidth()), false)
case *arrow.Uint16Type:
fv.dtype = flatbuf.TypeInt
fv.offset = intToFB(fv.b, int32(dt.BitWidth()), false)
case *arrow.Uint32Type:
fv.dtype = flatbuf.TypeInt
fv.offset = intToFB(fv.b, int32(dt.BitWidth()), false)
case *arrow.Uint64Type:
fv.dtype = flatbuf.TypeInt
fv.offset = intToFB(fv.b, int32(dt.BitWidth()), false)
case *arrow.Int8Type:
fv.dtype = flatbuf.TypeInt
fv.offset = intToFB(fv.b, int32(dt.BitWidth()), true)
case *arrow.Int16Type:
fv.dtype = flatbuf.TypeInt
fv.offset = intToFB(fv.b, int32(dt.BitWidth()), true)
case *arrow.Int32Type:
fv.dtype = flatbuf.TypeInt
fv.offset = intToFB(fv.b, int32(dt.BitWidth()), true)
case *arrow.Int64Type:
fv.dtype = flatbuf.TypeInt
fv.offset = intToFB(fv.b, int32(dt.BitWidth()), true)
case *arrow.Float16Type:
fv.dtype = flatbuf.TypeFloatingPoint
fv.offset = floatToFB(fv.b, int32(dt.BitWidth()))
case *arrow.Float32Type:
fv.dtype = flatbuf.TypeFloatingPoint
fv.offset = floatToFB(fv.b, int32(dt.BitWidth()))
case *arrow.Float64Type:
fv.dtype = flatbuf.TypeFloatingPoint
fv.offset = floatToFB(fv.b, int32(dt.BitWidth()))
case *arrow.Decimal128Type:
fv.dtype = flatbuf.TypeDecimal
flatbuf.DecimalStart(fv.b)
flatbuf.DecimalAddPrecision(fv.b, dt.Precision)
flatbuf.DecimalAddScale(fv.b, dt.Scale)
flatbuf.DecimalAddBitWidth(fv.b, 128)
fv.offset = flatbuf.DecimalEnd(fv.b)
case *arrow.Decimal256Type:
fv.dtype = flatbuf.TypeDecimal
flatbuf.DecimalStart(fv.b)
flatbuf.DecimalAddPrecision(fv.b, dt.Precision)
flatbuf.DecimalAddScale(fv.b, dt.Scale)
flatbuf.DecimalAddBitWidth(fv.b, 256)
fv.offset = flatbuf.DecimalEnd(fv.b)
case *arrow.FixedSizeBinaryType:
fv.dtype = flatbuf.TypeFixedSizeBinary
flatbuf.FixedSizeBinaryStart(fv.b)
flatbuf.FixedSizeBinaryAddByteWidth(fv.b, int32(dt.ByteWidth))
fv.offset = flatbuf.FixedSizeBinaryEnd(fv.b)
case *arrow.BinaryType:
fv.dtype = flatbuf.TypeBinary
flatbuf.BinaryStart(fv.b)
fv.offset = flatbuf.BinaryEnd(fv.b)
case *arrow.LargeBinaryType:
fv.dtype = flatbuf.TypeLargeBinary
flatbuf.LargeBinaryStart(fv.b)
fv.offset = flatbuf.LargeBinaryEnd(fv.b)
case *arrow.StringType:
fv.dtype = flatbuf.TypeUtf8
flatbuf.Utf8Start(fv.b)
fv.offset = flatbuf.Utf8End(fv.b)
case *arrow.LargeStringType:
fv.dtype = flatbuf.TypeLargeUtf8
flatbuf.LargeUtf8Start(fv.b)
fv.offset = flatbuf.LargeUtf8End(fv.b)
case *arrow.Date32Type:
fv.dtype = flatbuf.TypeDate
flatbuf.DateStart(fv.b)
flatbuf.DateAddUnit(fv.b, flatbuf.DateUnitDAY)
fv.offset = flatbuf.DateEnd(fv.b)
case *arrow.Date64Type:
fv.dtype = flatbuf.TypeDate
flatbuf.DateStart(fv.b)
flatbuf.DateAddUnit(fv.b, flatbuf.DateUnitMILLISECOND)
fv.offset = flatbuf.DateEnd(fv.b)
case *arrow.Time32Type:
fv.dtype = flatbuf.TypeTime
flatbuf.TimeStart(fv.b)
flatbuf.TimeAddUnit(fv.b, unitToFB(dt.Unit))
flatbuf.TimeAddBitWidth(fv.b, 32)
fv.offset = flatbuf.TimeEnd(fv.b)
case *arrow.Time64Type:
fv.dtype = flatbuf.TypeTime
flatbuf.TimeStart(fv.b)
flatbuf.TimeAddUnit(fv.b, unitToFB(dt.Unit))
flatbuf.TimeAddBitWidth(fv.b, 64)
fv.offset = flatbuf.TimeEnd(fv.b)
case *arrow.TimestampType:
fv.dtype = flatbuf.TypeTimestamp
unit := unitToFB(dt.Unit)
var tz flatbuffers.UOffsetT
if dt.TimeZone != "" {
tz = fv.b.CreateString(dt.TimeZone)
}
flatbuf.TimestampStart(fv.b)
flatbuf.TimestampAddUnit(fv.b, unit)
flatbuf.TimestampAddTimezone(fv.b, tz)
fv.offset = flatbuf.TimestampEnd(fv.b)
case *arrow.StructType:
fv.dtype = flatbuf.TypeStruct_
offsets := make([]flatbuffers.UOffsetT, len(dt.Fields()))
for i, field := range dt.Fields() {
offsets[i] = fieldToFB(fv.b, fv.pos.Child(int32(i)), field, fv.memo)
}
flatbuf.Struct_Start(fv.b)
for i := len(offsets) - 1; i >= 0; i-- {
fv.b.PrependUOffsetT(offsets[i])
}
fv.offset = flatbuf.Struct_End(fv.b)
fv.kids = append(fv.kids, offsets...)
case *arrow.ListType:
fv.dtype = flatbuf.TypeList
fv.kids = append(fv.kids, fieldToFB(fv.b, fv.pos.Child(0), dt.ElemField(), fv.memo))
flatbuf.ListStart(fv.b)
fv.offset = flatbuf.ListEnd(fv.b)
case *arrow.LargeListType:
fv.dtype = flatbuf.TypeLargeList
fv.kids = append(fv.kids, fieldToFB(fv.b, fv.pos.Child(0), dt.ElemField(), fv.memo))
flatbuf.LargeListStart(fv.b)
fv.offset = flatbuf.LargeListEnd(fv.b)
case *arrow.ListViewType:
fv.dtype = flatbuf.TypeListView
fv.kids = append(fv.kids, fieldToFB(fv.b, fv.pos.Child(0), dt.ElemField(), fv.memo))
flatbuf.ListViewStart(fv.b)
fv.offset = flatbuf.ListViewEnd(fv.b)
case *arrow.LargeListViewType:
fv.dtype = flatbuf.TypeLargeListView
fv.kids = append(fv.kids, fieldToFB(fv.b, fv.pos.Child(0), dt.ElemField(), fv.memo))
flatbuf.LargeListViewStart(fv.b)
fv.offset = flatbuf.LargeListViewEnd(fv.b)
case *arrow.FixedSizeListType:
fv.dtype = flatbuf.TypeFixedSizeList
fv.kids = append(fv.kids, fieldToFB(fv.b, fv.pos.Child(0), dt.ElemField(), fv.memo))
flatbuf.FixedSizeListStart(fv.b)
flatbuf.FixedSizeListAddListSize(fv.b, dt.Len())
fv.offset = flatbuf.FixedSizeListEnd(fv.b)
case *arrow.MonthIntervalType:
fv.dtype = flatbuf.TypeInterval
flatbuf.IntervalStart(fv.b)
flatbuf.IntervalAddUnit(fv.b, flatbuf.IntervalUnitYEAR_MONTH)
fv.offset = flatbuf.IntervalEnd(fv.b)
case *arrow.DayTimeIntervalType:
fv.dtype = flatbuf.TypeInterval
flatbuf.IntervalStart(fv.b)
flatbuf.IntervalAddUnit(fv.b, flatbuf.IntervalUnitDAY_TIME)
fv.offset = flatbuf.IntervalEnd(fv.b)
case *arrow.MonthDayNanoIntervalType:
fv.dtype = flatbuf.TypeInterval
flatbuf.IntervalStart(fv.b)
flatbuf.IntervalAddUnit(fv.b, flatbuf.IntervalUnitMONTH_DAY_NANO)
fv.offset = flatbuf.IntervalEnd(fv.b)
case *arrow.DurationType:
fv.dtype = flatbuf.TypeDuration
unit := unitToFB(dt.Unit)
flatbuf.DurationStart(fv.b)
flatbuf.DurationAddUnit(fv.b, unit)
fv.offset = flatbuf.DurationEnd(fv.b)
case *arrow.MapType:
fv.dtype = flatbuf.TypeMap
fv.kids = append(fv.kids, fieldToFB(fv.b, fv.pos.Child(0), dt.ElemField(), fv.memo))
flatbuf.MapStart(fv.b)
flatbuf.MapAddKeysSorted(fv.b, dt.KeysSorted)
fv.offset = flatbuf.MapEnd(fv.b)
case *arrow.RunEndEncodedType:
fv.dtype = flatbuf.TypeRunEndEncoded
var offsets [2]flatbuffers.UOffsetT
offsets[0] = fieldToFB(fv.b, fv.pos.Child(0),
arrow.Field{Name: "run_ends", Type: dt.RunEnds()}, fv.memo)
offsets[1] = fieldToFB(fv.b, fv.pos.Child(1),
arrow.Field{Name: "values", Type: dt.Encoded(), Nullable: true}, fv.memo)
flatbuf.RunEndEncodedStart(fv.b)
fv.b.PrependUOffsetT(offsets[1])
fv.b.PrependUOffsetT(offsets[0])
fv.offset = flatbuf.RunEndEncodedEnd(fv.b)
fv.kids = append(fv.kids, offsets[0], offsets[1])
case arrow.ExtensionType:
field.Type = dt.StorageType()
fv.visit(field)
fv.meta[ExtensionTypeKeyName] = dt.ExtensionName()
fv.meta[ExtensionMetadataKeyName] = string(dt.Serialize())
case *arrow.DictionaryType:
field.Type = dt.ValueType
fv.visit(field)
case arrow.UnionType:
fv.dtype = flatbuf.TypeUnion
offsets := make([]flatbuffers.UOffsetT, len(dt.Fields()))
for i, field := range dt.Fields() {
offsets[i] = fieldToFB(fv.b, fv.pos.Child(int32(i)), field, fv.memo)
}
codes := dt.TypeCodes()
flatbuf.UnionStartTypeIdsVector(fv.b, len(codes))
for i := len(codes) - 1; i >= 0; i-- {
fv.b.PlaceInt32(int32(codes[i]))
}
fbTypeIDs := fv.b.EndVector(len(dt.TypeCodes()))
flatbuf.UnionStart(fv.b)
switch dt.Mode() {
case arrow.SparseMode:
flatbuf.UnionAddMode(fv.b, flatbuf.UnionModeSparse)
case arrow.DenseMode:
flatbuf.UnionAddMode(fv.b, flatbuf.UnionModeDense)
default:
panic("invalid union mode")
}
flatbuf.UnionAddTypeIds(fv.b, fbTypeIDs)
fv.offset = flatbuf.UnionEnd(fv.b)
fv.kids = append(fv.kids, offsets...)
default:
err := fmt.Errorf("arrow/ipc: invalid data type %v", dt)
panic(err) // FIXME(sbinet): implement all data-types.
}
}
func (fv *fieldVisitor) result(field arrow.Field) flatbuffers.UOffsetT {
nameFB := fv.b.CreateString(field.Name)
fv.visit(field)
flatbuf.FieldStartChildrenVector(fv.b, len(fv.kids))
for i := len(fv.kids) - 1; i >= 0; i-- {
fv.b.PrependUOffsetT(fv.kids[i])
}
kidsFB := fv.b.EndVector(len(fv.kids))
storageType := field.Type
if storageType.ID() == arrow.EXTENSION {
storageType = storageType.(arrow.ExtensionType).StorageType()
}
var dictFB flatbuffers.UOffsetT
if storageType.ID() == arrow.DICTIONARY {
idxType := field.Type.(*arrow.DictionaryType).IndexType.(arrow.FixedWidthDataType)
dictID, err := fv.memo.GetFieldID(fv.pos.Path())
if err != nil {
panic(err)
}
var signed bool
switch idxType.ID() {
case arrow.UINT8, arrow.UINT16, arrow.UINT32, arrow.UINT64:
signed = false
case arrow.INT8, arrow.INT16, arrow.INT32, arrow.INT64:
signed = true
}
indexTypeOffset := intToFB(fv.b, int32(idxType.BitWidth()), signed)
flatbuf.DictionaryEncodingStart(fv.b)
flatbuf.DictionaryEncodingAddId(fv.b, dictID)
flatbuf.DictionaryEncodingAddIndexType(fv.b, indexTypeOffset)
flatbuf.DictionaryEncodingAddIsOrdered(fv.b, field.Type.(*arrow.DictionaryType).Ordered)
dictFB = flatbuf.DictionaryEncodingEnd(fv.b)
}
var (
metaFB flatbuffers.UOffsetT
kvs []flatbuffers.UOffsetT
)
for i, k := range field.Metadata.Keys() {
v := field.Metadata.Values()[i]
kk := fv.b.CreateString(k)
vv := fv.b.CreateString(v)
flatbuf.KeyValueStart(fv.b)
flatbuf.KeyValueAddKey(fv.b, kk)
flatbuf.KeyValueAddValue(fv.b, vv)
kvs = append(kvs, flatbuf.KeyValueEnd(fv.b))
}
{
keys := make([]string, 0, len(fv.meta))
for k := range fv.meta {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
v := fv.meta[k]
kk := fv.b.CreateString(k)
vv := fv.b.CreateString(v)
flatbuf.KeyValueStart(fv.b)
flatbuf.KeyValueAddKey(fv.b, kk)
flatbuf.KeyValueAddValue(fv.b, vv)
kvs = append(kvs, flatbuf.KeyValueEnd(fv.b))
}
}
if len(kvs) > 0 {
flatbuf.FieldStartCustomMetadataVector(fv.b, len(kvs))
for i := len(kvs) - 1; i >= 0; i-- {
fv.b.PrependUOffsetT(kvs[i])
}
metaFB = fv.b.EndVector(len(kvs))
}
flatbuf.FieldStart(fv.b)
flatbuf.FieldAddName(fv.b, nameFB)
flatbuf.FieldAddNullable(fv.b, field.Nullable)
flatbuf.FieldAddTypeType(fv.b, fv.dtype)
flatbuf.FieldAddType(fv.b, fv.offset)
flatbuf.FieldAddDictionary(fv.b, dictFB)
flatbuf.FieldAddChildren(fv.b, kidsFB)
flatbuf.FieldAddCustomMetadata(fv.b, metaFB)
offset := flatbuf.FieldEnd(fv.b)
return offset
}
func typeFromFB(field *flatbuf.Field, pos dictutils.FieldPos, children []arrow.Field, md *arrow.Metadata, memo *dictutils.Memo) (arrow.DataType, error) {
var data flatbuffers.Table
if !field.Type(&data) {
return nil, fmt.Errorf("arrow/ipc: could not load field type data")
}
dt, err := concreteTypeFromFB(field.TypeType(), data, children)
if err != nil {
return dt, err
}
var (
dictID = int64(-1)
dictValueType arrow.DataType
encoding = field.Dictionary(nil)
)
if encoding != nil {
var idt flatbuf.Int
encoding.IndexType(&idt)
idxType, err := intFromFB(idt)
if err != nil {
return nil, err
}
dictValueType = dt
dt = &arrow.DictionaryType{IndexType: idxType, ValueType: dictValueType, Ordered: encoding.IsOrdered()}
dictID = encoding.Id()
if err = memo.Mapper.AddField(dictID, pos.Path()); err != nil {
return dt, err
}
if err = memo.AddType(dictID, dictValueType); err != nil {
return dt, err
}
}
// look for extension metadata in custom metadata field.
if md.Len() > 0 {
i := md.FindKey(ExtensionTypeKeyName)
if i < 0 {
return dt, err
}
extType := arrow.GetExtensionType(md.Values()[i])
if extType == nil {
// if the extension type is unknown, we do not error here.
// simply return the storage type.
return dt, err
}
var (
data string
dataIdx int
)
if dataIdx = md.FindKey(ExtensionMetadataKeyName); dataIdx >= 0 {
data = md.Values()[dataIdx]
}
dt, err = extType.Deserialize(dt, data)
if err != nil {
return dt, err
}
mdkeys := md.Keys()
mdvals := md.Values()
if dataIdx < 0 {
// if there was no extension metadata, just the name, we only have to
// remove the extension name metadata key/value to ensure roundtrip
// metadata consistency
*md = arrow.NewMetadata(append(mdkeys[:i], mdkeys[i+1:]...), append(mdvals[:i], mdvals[i+1:]...))
} else {
// if there was extension metadata, we need to remove both the type name
// and the extension metadata keys and values.
newkeys := make([]string, 0, md.Len()-2)
newvals := make([]string, 0, md.Len()-2)
for j := range mdkeys {
if j != i && j != dataIdx { // copy everything except the extension metadata keys/values
newkeys = append(newkeys, mdkeys[j])
newvals = append(newvals, mdvals[j])
}
}
*md = arrow.NewMetadata(newkeys, newvals)
}
}
return dt, err
}
func concreteTypeFromFB(typ flatbuf.Type, data flatbuffers.Table, children []arrow.Field) (arrow.DataType, error) {
switch typ {
case flatbuf.TypeNONE:
return nil, fmt.Errorf("arrow/ipc: Type metadata cannot be none")
case flatbuf.TypeNull:
return arrow.Null, nil
case flatbuf.TypeInt:
var dt flatbuf.Int
dt.Init(data.Bytes, data.Pos)
return intFromFB(dt)
case flatbuf.TypeFloatingPoint:
var dt flatbuf.FloatingPoint
dt.Init(data.Bytes, data.Pos)
return floatFromFB(dt)
case flatbuf.TypeDecimal:
var dt flatbuf.Decimal
dt.Init(data.Bytes, data.Pos)
return decimalFromFB(dt)
case flatbuf.TypeBinary:
return arrow.BinaryTypes.Binary, nil
case flatbuf.TypeFixedSizeBinary:
var dt flatbuf.FixedSizeBinary
dt.Init(data.Bytes, data.Pos)
return &arrow.FixedSizeBinaryType{ByteWidth: int(dt.ByteWidth())}, nil
case flatbuf.TypeUtf8:
return arrow.BinaryTypes.String, nil
case flatbuf.TypeLargeBinary:
return arrow.BinaryTypes.LargeBinary, nil
case flatbuf.TypeLargeUtf8:
return arrow.BinaryTypes.LargeString, nil
case flatbuf.TypeBool:
return arrow.FixedWidthTypes.Boolean, nil
case flatbuf.TypeList:
if len(children) != 1 {
return nil, fmt.Errorf("arrow/ipc: List must have exactly 1 child field (got=%d)", len(children))
}
dt := arrow.ListOfField(children[0])
return dt, nil
case flatbuf.TypeLargeList:
if len(children) != 1 {
return nil, fmt.Errorf("arrow/ipc: LargeList must have exactly 1 child field (got=%d)", len(children))
}
dt := arrow.LargeListOfField(children[0])
return dt, nil
case flatbuf.TypeListView:
if len(children) != 1 {
return nil, fmt.Errorf("arrow/ipc: ListView must have exactly 1 child field (got=%d)", len(children))
}
dt := arrow.ListViewOfField(children[0])
return dt, nil
case flatbuf.TypeLargeListView:
if len(children) != 1 {
return nil, fmt.Errorf("arrow/ipc: LargeListView must have exactly 1 child field (got=%d)", len(children))
}
dt := arrow.LargeListViewOfField(children[0])
return dt, nil
case flatbuf.TypeFixedSizeList:
var dt flatbuf.FixedSizeList
dt.Init(data.Bytes, data.Pos)
if len(children) != 1 {
return nil, fmt.Errorf("arrow/ipc: FixedSizeList must have exactly 1 child field (got=%d)", len(children))
}
ret := arrow.FixedSizeListOfField(dt.ListSize(), children[0])
return ret, nil
case flatbuf.TypeStruct_:
return arrow.StructOf(children...), nil
case flatbuf.TypeUnion:
var dt flatbuf.Union
dt.Init(data.Bytes, data.Pos)
var (
mode arrow.UnionMode
typeIDs []arrow.UnionTypeCode
)
switch dt.Mode() {
case flatbuf.UnionModeSparse:
mode = arrow.SparseMode
case flatbuf.UnionModeDense:
mode = arrow.DenseMode
}
typeIDLen := dt.TypeIdsLength()
if typeIDLen == 0 {
for i := range children {
typeIDs = append(typeIDs, int8(i))
}
} else {
for i := 0; i < typeIDLen; i++ {
id := dt.TypeIds(i)
code := arrow.UnionTypeCode(id)
if int32(code) != id {
return nil, errors.New("union type id out of bounds")
}
typeIDs = append(typeIDs, code)
}
}
return arrow.UnionOf(mode, children, typeIDs), nil
case flatbuf.TypeTime:
var dt flatbuf.Time
dt.Init(data.Bytes, data.Pos)
return timeFromFB(dt)
case flatbuf.TypeTimestamp:
var dt flatbuf.Timestamp
dt.Init(data.Bytes, data.Pos)
return timestampFromFB(dt)
case flatbuf.TypeDate:
var dt flatbuf.Date
dt.Init(data.Bytes, data.Pos)
return dateFromFB(dt)
case flatbuf.TypeInterval:
var dt flatbuf.Interval
dt.Init(data.Bytes, data.Pos)
return intervalFromFB(dt)
case flatbuf.TypeDuration:
var dt flatbuf.Duration
dt.Init(data.Bytes, data.Pos)
return durationFromFB(dt)
case flatbuf.TypeMap:
if len(children) != 1 {
return nil, fmt.Errorf("arrow/ipc: Map must have exactly 1 child field")
}
if children[0].Nullable || children[0].Type.ID() != arrow.STRUCT || len(children[0].Type.(*arrow.StructType).Fields()) != 2 {
return nil, fmt.Errorf("arrow/ipc: Map's key-item pairs must be non-nullable structs")
}
pairType := children[0].Type.(*arrow.StructType)
if pairType.Field(0).Nullable {
return nil, fmt.Errorf("arrow/ipc: Map's keys must be non-nullable")
}
var dt flatbuf.Map
dt.Init(data.Bytes, data.Pos)
ret := arrow.MapOf(pairType.Field(0).Type, pairType.Field(1).Type)
ret.SetItemNullable(pairType.Field(1).Nullable)
ret.KeysSorted = dt.KeysSorted()
return ret, nil
case flatbuf.TypeRunEndEncoded:
if len(children) != 2 {
return nil, fmt.Errorf("%w: arrow/ipc: RunEndEncoded must have exactly 2 child fields", arrow.ErrInvalid)
}
switch children[0].Type.ID() {
case arrow.INT16, arrow.INT32, arrow.INT64:
default:
return nil, fmt.Errorf("%w: arrow/ipc: run-end encoded run_ends field must be one of int16, int32, or int64 type", arrow.ErrInvalid)
}
return arrow.RunEndEncodedOf(children[0].Type, children[1].Type), nil
default:
panic(fmt.Errorf("arrow/ipc: type %v not implemented", flatbuf.EnumNamesType[typ]))
}
}
func intFromFB(data flatbuf.Int) (arrow.DataType, error) {
bw := data.BitWidth()
if bw > 64 {
return nil, fmt.Errorf("arrow/ipc: integers with more than 64 bits not implemented (bits=%d)", bw)
}
if bw < 8 {
return nil, fmt.Errorf("arrow/ipc: integers with less than 8 bits not implemented (bits=%d)", bw)
}
switch bw {
case 8:
if !data.IsSigned() {
return arrow.PrimitiveTypes.Uint8, nil
}
return arrow.PrimitiveTypes.Int8, nil
case 16:
if !data.IsSigned() {
return arrow.PrimitiveTypes.Uint16, nil
}
return arrow.PrimitiveTypes.Int16, nil
case 32:
if !data.IsSigned() {
return arrow.PrimitiveTypes.Uint32, nil
}
return arrow.PrimitiveTypes.Int32, nil
case 64:
if !data.IsSigned() {
return arrow.PrimitiveTypes.Uint64, nil
}
return arrow.PrimitiveTypes.Int64, nil
default:
return nil, fmt.Errorf("arrow/ipc: integers not in cstdint are not implemented")
}
}
func intToFB(b *flatbuffers.Builder, bw int32, isSigned bool) flatbuffers.UOffsetT {
flatbuf.IntStart(b)
flatbuf.IntAddBitWidth(b, bw)
flatbuf.IntAddIsSigned(b, isSigned)
return flatbuf.IntEnd(b)
}
func floatFromFB(data flatbuf.FloatingPoint) (arrow.DataType, error) {
switch p := data.Precision(); p {
case flatbuf.PrecisionHALF:
return arrow.FixedWidthTypes.Float16, nil
case flatbuf.PrecisionSINGLE:
return arrow.PrimitiveTypes.Float32, nil
case flatbuf.PrecisionDOUBLE:
return arrow.PrimitiveTypes.Float64, nil
default:
return nil, fmt.Errorf("arrow/ipc: floating point type with %d precision not implemented", p)
}
}
func floatToFB(b *flatbuffers.Builder, bw int32) flatbuffers.UOffsetT {
switch bw {
case 16:
flatbuf.FloatingPointStart(b)
flatbuf.FloatingPointAddPrecision(b, flatbuf.PrecisionHALF)
return flatbuf.FloatingPointEnd(b)
case 32:
flatbuf.FloatingPointStart(b)
flatbuf.FloatingPointAddPrecision(b, flatbuf.PrecisionSINGLE)
return flatbuf.FloatingPointEnd(b)
case 64:
flatbuf.FloatingPointStart(b)
flatbuf.FloatingPointAddPrecision(b, flatbuf.PrecisionDOUBLE)
return flatbuf.FloatingPointEnd(b)
default:
panic(fmt.Errorf("arrow/ipc: invalid floating point precision %d-bits", bw))
}
}
func decimalFromFB(data flatbuf.Decimal) (arrow.DataType, error) {
switch data.BitWidth() {
case 128:
return &arrow.Decimal128Type{Precision: data.Precision(), Scale: data.Scale()}, nil
case 256:
return &arrow.Decimal256Type{Precision: data.Precision(), Scale: data.Scale()}, nil
default:
return nil, fmt.Errorf("arrow/ipc: invalid decimal bitwidth: %d", data.BitWidth())
}
}
func timeFromFB(data flatbuf.Time) (arrow.DataType, error) {
bw := data.BitWidth()
unit := unitFromFB(data.Unit())
switch bw {
case 32:
switch unit {
case arrow.Millisecond:
return arrow.FixedWidthTypes.Time32ms, nil
case arrow.Second:
return arrow.FixedWidthTypes.Time32s, nil
default:
return nil, fmt.Errorf("arrow/ipc: Time32 type with %v unit not implemented", unit)
}
case 64:
switch unit {
case arrow.Nanosecond:
return arrow.FixedWidthTypes.Time64ns, nil
case arrow.Microsecond:
return arrow.FixedWidthTypes.Time64us, nil
default:
return nil, fmt.Errorf("arrow/ipc: Time64 type with %v unit not implemented", unit)
}
default:
return nil, fmt.Errorf("arrow/ipc: Time type with %d bitwidth not implemented", bw)
}
}
func timestampFromFB(data flatbuf.Timestamp) (arrow.DataType, error) {
unit := unitFromFB(data.Unit())
tz := string(data.Timezone())
return &arrow.TimestampType{Unit: unit, TimeZone: tz}, nil
}
func dateFromFB(data flatbuf.Date) (arrow.DataType, error) {
switch data.Unit() {
case flatbuf.DateUnitDAY:
return arrow.FixedWidthTypes.Date32, nil
case flatbuf.DateUnitMILLISECOND:
return arrow.FixedWidthTypes.Date64, nil
}
return nil, fmt.Errorf("arrow/ipc: Date type with %d unit not implemented", data.Unit())
}
func intervalFromFB(data flatbuf.Interval) (arrow.DataType, error) {
switch data.Unit() {
case flatbuf.IntervalUnitYEAR_MONTH:
return arrow.FixedWidthTypes.MonthInterval, nil
case flatbuf.IntervalUnitDAY_TIME:
return arrow.FixedWidthTypes.DayTimeInterval, nil
case flatbuf.IntervalUnitMONTH_DAY_NANO:
return arrow.FixedWidthTypes.MonthDayNanoInterval, nil
}
return nil, fmt.Errorf("arrow/ipc: Interval type with %d unit not implemented", data.Unit())
}
func durationFromFB(data flatbuf.Duration) (arrow.DataType, error) {
switch data.Unit() {