1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777
|
// 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 scalar
import (
"errors"
"fmt"
"math/bits"
"reflect"
"strconv"
"strings"
"time"
"github.com/apache/arrow-go/v18/arrow"
"github.com/apache/arrow-go/v18/arrow/array"
"github.com/apache/arrow-go/v18/arrow/decimal128"
"github.com/apache/arrow-go/v18/arrow/decimal256"
"github.com/apache/arrow-go/v18/arrow/float16"
"github.com/apache/arrow-go/v18/arrow/memory"
)
type TypeToScalar interface {
ToScalar() (Scalar, error)
}
type TypeFromScalar interface {
FromStructScalar(*Struct) error
}
type hasTypename interface {
TypeName() string
}
var (
hasTypenameType = reflect.TypeOf((*hasTypename)(nil)).Elem()
dataTypeType = reflect.TypeOf((*arrow.DataType)(nil)).Elem()
)
func FromScalar(sc *Struct, val interface{}) error {
if sc == nil || len(sc.Value) == 0 {
return nil
}
if v, ok := val.(TypeFromScalar); ok {
return v.FromStructScalar(sc)
}
v := reflect.ValueOf(val)
if v.Kind() != reflect.Ptr {
return errors.New("fromscalar must be given a pointer to an object to populate")
}
value := reflect.Indirect(v)
for i := 0; i < value.Type().NumField(); i++ {
fld := value.Type().Field(i)
tag := fld.Tag.Get("compute")
if tag == "-" || fld.Name == "_type_name" {
continue
}
fldVal, err := sc.Field(tag)
if err != nil {
return err
}
if err := setFromScalar(fldVal, value.Field(i)); err != nil {
return err
}
}
return nil
}
func setFromScalar(s Scalar, v reflect.Value) error {
if v.Type() == dataTypeType {
v.Set(reflect.ValueOf(s.DataType()))
return nil
}
switch s := s.(type) {
case BinaryScalar:
value := s.value().(*memory.Buffer)
switch v.Kind() {
case reflect.String:
if value == nil {
v.SetString("")
} else {
v.SetString(string(value.Bytes()))
}
default:
if value == nil {
v.SetBytes(nil)
} else {
v.SetBytes(value.Bytes())
}
}
case ListScalar:
return fromListScalar(s, v)
case *Struct:
return FromScalar(s, v.Interface())
default:
if v.Type() == reflect.TypeOf(arrow.TimeUnit(0)) {
v.Set(reflect.ValueOf(arrow.TimeUnit(s.value().(uint32))))
} else {
v.Set(reflect.ValueOf(s.value()))
}
}
return nil
}
func ToScalar(val interface{}, mem memory.Allocator) (Scalar, error) {
switch v := val.(type) {
case arrow.DataType:
return MakeScalar(v), nil
case TypeToScalar:
return v.ToScalar()
}
v := reflect.Indirect(reflect.ValueOf(val))
switch v.Kind() {
case reflect.Struct:
scalars := make([]Scalar, 0, v.Type().NumField())
fields := make([]string, 0, v.Type().NumField())
for i := 0; i < v.Type().NumField(); i++ {
fld := v.Type().Field(i)
tag := fld.Tag.Get("compute")
if tag == "-" {
continue
}
fldVal := v.Field(i)
s, err := ToScalar(fldVal.Interface(), mem)
if err != nil {
return nil, err
}
scalars = append(scalars, s)
fields = append(fields, tag)
}
if v.Type().Implements(hasTypenameType) {
t := val.(hasTypename)
scalars = append(scalars, NewBinaryScalar(memory.NewBufferBytes([]byte(t.TypeName())), arrow.BinaryTypes.Binary))
fields = append(fields, "_type_name")
}
return NewStructScalarWithNames(scalars, fields)
case reflect.Slice:
return createListScalar(v, mem)
default:
return MakeScalar(val), nil
}
}
func createListScalar(sliceval reflect.Value, mem memory.Allocator) (Scalar, error) {
if sliceval.Kind() != reflect.Slice {
return nil, fmt.Errorf("createListScalar only works for slices, not %s", sliceval.Kind())
}
var arr arrow.Array
switch sliceval.Type().Elem().Kind() {
case reflect.String:
bldr := array.NewStringBuilder(mem)
defer bldr.Release()
bldr.AppendValues(sliceval.Interface().([]string), nil)
arr = bldr.NewArray()
case reflect.Bool:
bldr := array.NewBooleanBuilder(mem)
defer bldr.Release()
bldr.AppendValues(sliceval.Interface().([]bool), nil)
arr = bldr.NewArray()
case reflect.Int8:
bldr := array.NewInt8Builder(mem)
defer bldr.Release()
bldr.AppendValues(sliceval.Interface().([]int8), nil)
arr = bldr.NewArray()
case reflect.Uint8:
bldr := array.NewUint8Builder(mem)
defer bldr.Release()
bldr.AppendValues(sliceval.Interface().([]uint8), nil)
arr = bldr.NewArray()
case reflect.Int16:
bldr := array.NewInt16Builder(mem)
defer bldr.Release()
bldr.AppendValues(sliceval.Interface().([]int16), nil)
arr = bldr.NewArray()
case reflect.Uint16:
bldr := array.NewUint16Builder(mem)
defer bldr.Release()
bldr.AppendValues(sliceval.Interface().([]uint16), nil)
arr = bldr.NewArray()
case reflect.Int32:
bldr := array.NewInt32Builder(mem)
defer bldr.Release()
bldr.AppendValues(sliceval.Interface().([]int32), nil)
arr = bldr.NewArray()
case reflect.Uint32:
bldr := array.NewUint32Builder(mem)
defer bldr.Release()
bldr.AppendValues(sliceval.Interface().([]uint32), nil)
arr = bldr.NewArray()
case reflect.Int64:
bldr := array.NewInt64Builder(mem)
defer bldr.Release()
bldr.AppendValues(sliceval.Interface().([]int64), nil)
arr = bldr.NewArray()
case reflect.Uint64:
bldr := array.NewUint64Builder(mem)
defer bldr.Release()
bldr.AppendValues(sliceval.Interface().([]uint64), nil)
arr = bldr.NewArray()
case reflect.Int:
if bits.UintSize == 32 {
bldr := array.NewInt32Builder(mem)
defer bldr.Release()
for _, v := range sliceval.Interface().([]int) {
bldr.Append(int32(v))
}
arr = bldr.NewArray()
break
}
bldr := array.NewInt64Builder(mem)
defer bldr.Release()
for _, v := range sliceval.Interface().([]int) {
bldr.Append(int64(v))
}
arr = bldr.NewArray()
case reflect.Uint:
if bits.UintSize == 32 {
bldr := array.NewUint32Builder(mem)
defer bldr.Release()
for _, v := range sliceval.Interface().([]uint) {
bldr.Append(uint32(v))
}
arr = bldr.NewArray()
break
}
bldr := array.NewUint64Builder(mem)
defer bldr.Release()
for _, v := range sliceval.Interface().([]uint) {
bldr.Append(uint64(v))
}
arr = bldr.NewArray()
case reflect.Ptr:
meta, ok := sliceval.Interface().([]*arrow.Metadata)
if !ok {
break
}
bldr := array.NewMapBuilder(mem, arrow.BinaryTypes.Binary, arrow.BinaryTypes.Binary, false)
defer bldr.Release()
kbldr := bldr.KeyBuilder().(*array.BinaryBuilder)
ibldr := bldr.ItemBuilder().(*array.BinaryBuilder)
for _, md := range meta {
bldr.Append(true)
if md != nil {
kbldr.AppendStringValues(md.Keys(), nil)
ibldr.AppendStringValues(md.Values(), nil)
}
}
arr := bldr.NewMapArray()
defer arr.Release()
return NewListScalar(arr), nil
}
if arr == nil {
return nil, fmt.Errorf("createListScalar not implemented for %s", sliceval.Type())
}
defer arr.Release()
return MakeScalarParam(arr, arrow.ListOf(arr.DataType()))
}
func fromListScalar(s ListScalar, v reflect.Value) error {
if v.Kind() != reflect.Slice {
return fmt.Errorf("could not populate field from list scalar, incompatible types: %s is not a slice", v.Type().String())
}
arr := s.GetList()
v.Set(reflect.MakeSlice(v.Type(), arr.Len(), arr.Len()))
switch arr := arr.(type) {
case *array.Boolean:
for i := 0; i < arr.Len(); i++ {
v.Index(i).SetBool(arr.Value(i))
}
case *array.Int8:
reflect.Copy(v, reflect.ValueOf(arr.Int8Values()))
case *array.Uint8:
reflect.Copy(v, reflect.ValueOf(arr.Uint8Values()))
case *array.Int16:
reflect.Copy(v, reflect.ValueOf(arr.Int16Values()))
case *array.Uint16:
reflect.Copy(v, reflect.ValueOf(arr.Uint16Values()))
case *array.Int32:
reflect.Copy(v, reflect.ValueOf(arr.Int32Values()))
case *array.Uint32:
reflect.Copy(v, reflect.ValueOf(arr.Uint32Values()))
case *array.Int64:
reflect.Copy(v, reflect.ValueOf(arr.Int64Values()))
case *array.Uint64:
reflect.Copy(v, reflect.ValueOf(arr.Uint64Values()))
case *array.Float32:
reflect.Copy(v, reflect.ValueOf(arr.Float32Values()))
case *array.Float64:
reflect.Copy(v, reflect.ValueOf(arr.Float64Values()))
case *array.Binary:
for i := 0; i < arr.Len(); i++ {
v.Index(i).SetString(arr.ValueString(i))
}
case *array.String:
for i := 0; i < arr.Len(); i++ {
v.Index(i).SetString(arr.Value(i))
}
case *array.Map:
// only implementing slice of metadata for now
if v.Type().Elem() != reflect.PointerTo(reflect.TypeOf(arrow.Metadata{})) {
return fmt.Errorf("unimplemented fromListScalar type %s to %s", arr.DataType(), v.Type().String())
}
var (
offsets = arr.Offsets()
keys = arr.Keys().(*array.Binary)
values = arr.Items().(*array.Binary)
metaKeys []string
metaValues []string
)
for i, o := range offsets[:len(offsets)-1] {
start := o
end := offsets[i+1]
metaKeys = make([]string, end-start)
metaValues = make([]string, end-start)
for j := start; j < end; j++ {
metaKeys = append(metaKeys, keys.ValueString(int(j)))
metaValues = append(metaValues, values.ValueString(int(j)))
}
m := arrow.NewMetadata(metaKeys, metaValues)
v.Index(i).Set(reflect.ValueOf(&m))
}
default:
return fmt.Errorf("unimplemented fromListScalar type: %s", arr.DataType())
}
return nil
}
// MakeScalarParam is for converting a value to a scalar when it requires a
// parameterized data type such as a time type that needs units, or a fixed
// size list which needs it's size.
//
// Will fall back to MakeScalar without the passed in type if not one of the
// parameterized types.
func MakeScalarParam(val interface{}, dt arrow.DataType) (Scalar, error) {
switch v := val.(type) {
case []byte:
buf := memory.NewBufferBytes(v)
defer buf.Release()
switch dt.ID() {
case arrow.BINARY:
return NewBinaryScalar(buf, dt), nil
case arrow.LARGE_BINARY:
return NewLargeBinaryScalar(buf), nil
case arrow.STRING:
return NewStringScalarFromBuffer(buf), nil
case arrow.LARGE_STRING:
return NewLargeStringScalarFromBuffer(buf), nil
case arrow.FIXED_SIZE_BINARY:
if buf.Len() == dt.(*arrow.FixedSizeBinaryType).ByteWidth {
return NewFixedSizeBinaryScalar(buf, dt), nil
}
return nil, fmt.Errorf("invalid scalar value of len %d for type %s", v, dt)
}
case *memory.Buffer:
switch dt.ID() {
case arrow.BINARY:
return NewBinaryScalar(v, dt), nil
case arrow.LARGE_BINARY:
return NewLargeBinaryScalar(v), nil
case arrow.STRING:
return NewStringScalarFromBuffer(v), nil
case arrow.LARGE_STRING:
return NewLargeStringScalarFromBuffer(v), nil
case arrow.FIXED_SIZE_BINARY:
if v.Len() == dt.(*arrow.FixedSizeBinaryType).ByteWidth {
return NewFixedSizeBinaryScalar(v, dt), nil
}
return nil, fmt.Errorf("invalid scalar value of len %d for type %s", v.Len(), dt)
}
case string:
switch {
case arrow.IsBaseBinary(dt.ID()):
buf := memory.NewBufferBytes([]byte(v))
defer buf.Release()
switch dt.ID() {
case arrow.BINARY:
return NewBinaryScalar(buf, dt), nil
case arrow.LARGE_BINARY:
return NewLargeBinaryScalar(buf), nil
case arrow.STRING:
return NewStringScalar(v), nil
case arrow.LARGE_STRING:
return NewLargeStringScalar(v), nil
}
case arrow.IsInteger(dt.ID()):
bits := dt.(arrow.FixedWidthDataType).BitWidth()
if arrow.IsUnsignedInteger(dt.ID()) {
val, err := strconv.ParseUint(v, 0, bits)
if err != nil {
return nil, err
}
return MakeUnsignedIntegerScalar(val, bits)
}
val, err := strconv.ParseInt(v, 0, bits)
if err != nil {
return nil, err
}
return MakeIntegerScalar(val, bits)
case arrow.IsFixedSizeBinary(dt.ID()):
switch dt.ID() {
case arrow.FIXED_SIZE_BINARY:
ty := dt.(*arrow.FixedSizeBinaryType)
if len(v) != ty.ByteWidth {
return nil, fmt.Errorf("%w: invalid length for fixed size binary scalar", arrow.ErrInvalid)
}
return NewFixedSizeBinaryScalar(memory.NewBufferBytes([]byte(v)), ty), nil
case arrow.DECIMAL128:
ty := dt.(*arrow.Decimal128Type)
n, err := decimal128.FromString(v, ty.Precision, ty.Scale)
if err != nil {
return nil, err
}
return NewDecimal128Scalar(n, ty), nil
case arrow.DECIMAL256:
ty := dt.(*arrow.Decimal256Type)
n, err := decimal256.FromString(v, ty.Precision, ty.Scale)
if err != nil {
return nil, err
}
return NewDecimal256Scalar(n, ty), nil
}
case arrow.IsFloating(dt.ID()):
bits := dt.(arrow.FixedWidthDataType).BitWidth()
val, err := strconv.ParseFloat(v, bits)
if err != nil {
return nil, err
}
if bits == 32 {
return NewFloat32Scalar(float32(val)), nil
}
return NewFloat64Scalar(val), nil
case dt.ID() == arrow.TIMESTAMP:
ty := dt.(*arrow.TimestampType)
if ty.TimeZone == "" || strings.ToLower(ty.TimeZone) == "utc" {
ts, err := arrow.TimestampFromString(v, ty.Unit)
if err != nil {
return nil, err
}
return NewTimestampScalar(ts, dt), nil
}
loc, err := time.LoadLocation(ty.TimeZone)
if err != nil {
return nil, err
}
ts, _, err := arrow.TimestampFromStringInLocation(v, ty.Unit, loc)
if err != nil {
return nil, err
}
return NewTimestampScalar(ts, ty), nil
}
case arrow.Time32:
return NewTime32Scalar(v, dt), nil
case arrow.Time64:
return NewTime64Scalar(v, dt), nil
case arrow.Timestamp:
return NewTimestampScalar(v, dt), nil
case arrow.Array:
switch dt.ID() {
case arrow.LIST:
if !arrow.TypeEqual(v.DataType(), dt.(*arrow.ListType).Elem()) {
return nil, fmt.Errorf("inconsistent type for list scalar array and data type")
}
return NewListScalar(v), nil
case arrow.LARGE_LIST:
if !arrow.TypeEqual(v.DataType(), dt.(*arrow.LargeListType).Elem()) {
return nil, fmt.Errorf("inconsistent type for large list scalar array and data type")
}
return NewLargeListScalar(v), nil
case arrow.FIXED_SIZE_LIST:
if !arrow.TypeEqual(v.DataType(), dt.(*arrow.FixedSizeListType).Elem()) {
return nil, fmt.Errorf("inconsistent type for list scalar array and data type")
}
return NewFixedSizeListScalarWithType(v, dt), nil
case arrow.MAP:
if !arrow.TypeEqual(dt.(*arrow.MapType).Elem(), v.DataType()) {
return nil, fmt.Errorf("inconsistent type for map scalar type")
}
return NewMapScalar(v), nil
}
case decimal128.Num:
if _, ok := dt.(*arrow.Decimal128Type); !ok {
return nil, fmt.Errorf("mismatch cannot create decimal128 scalar with incorrect data type")
}
return NewDecimal128Scalar(v, dt), nil
case decimal256.Num:
if _, ok := dt.(*arrow.Decimal256Type); !ok {
return nil, fmt.Errorf("mismatch cannot create decimal256 scalar with incorrect data type")
}
return NewDecimal256Scalar(v, dt), nil
}
if arrow.IsInteger(dt.ID()) {
bits := dt.(arrow.FixedWidthDataType).BitWidth()
val := reflect.ValueOf(val)
if arrow.IsUnsignedInteger(dt.ID()) {
return MakeUnsignedIntegerScalar(val.Convert(reflect.TypeOf(uint64(0))).Uint(), bits)
}
return MakeIntegerScalar(val.Convert(reflect.TypeOf(int64(0))).Int(), bits)
}
if dt.ID() == arrow.DICTIONARY {
return MakeScalarParam(val, dt.(*arrow.DictionaryType).ValueType)
}
return MakeScalar(val), nil
}
// MakeScalar creates a scalar of the passed in type via reflection.
func MakeScalar(val interface{}) Scalar {
switch v := val.(type) {
case nil:
return ScalarNull
case bool:
return NewBooleanScalar(v)
case int8:
return NewInt8Scalar(v)
case uint8:
return NewUint8Scalar(v)
case int16:
return NewInt16Scalar(v)
case uint16:
return NewUint16Scalar(v)
case int32:
return NewInt32Scalar(v)
case uint32:
return NewUint32Scalar(v)
case int64:
return NewInt64Scalar(v)
case uint64:
return NewUint64Scalar(v)
case int:
// determine size of an int on this system
switch bits.UintSize {
case 32:
return NewInt32Scalar(int32(v))
case 64:
return NewInt64Scalar(int64(v))
}
case uint:
// determine size of an int on this system
switch bits.UintSize {
case 32:
return NewUint32Scalar(uint32(v))
case 64:
return NewUint64Scalar(uint64(v))
}
case []byte:
buf := memory.NewBufferBytes(v)
defer buf.Release()
return NewBinaryScalar(buf, arrow.BinaryTypes.Binary)
case string:
return NewStringScalar(v)
case arrow.Date32:
return NewDate32Scalar(v)
case arrow.Date64:
return NewDate64Scalar(v)
case float16.Num:
return NewFloat16Scalar(v)
case float32:
return NewFloat32Scalar(v)
case float64:
return NewFloat64Scalar(v)
case arrow.MonthInterval:
return NewMonthIntervalScalar(v)
case arrow.DayTimeInterval:
return NewDayTimeIntervalScalar(v)
case arrow.MonthDayNanoInterval:
return NewMonthDayNanoIntervalScalar(v)
case arrow.DataType:
return MakeNullScalar(v)
default:
testval := reflect.ValueOf(v)
if testval.Type().ConvertibleTo(reflect.TypeOf(uint32(0))) {
return NewUint32Scalar(uint32(testval.Convert(reflect.TypeOf(uint32(0))).Uint()))
}
}
panic(fmt.Errorf("makescalar not implemented for type value %#v", val))
}
// MakeIntegerScalar is a helper function for creating an integer scalar of a
// given bitsize.
func MakeIntegerScalar(v int64, bitsize int) (Scalar, error) {
switch bitsize {
case 8:
return NewInt8Scalar(int8(v)), nil
case 16:
return NewInt16Scalar(int16(v)), nil
case 32:
return NewInt32Scalar(int32(v)), nil
case 64:
return NewInt64Scalar(int64(v)), nil
}
return nil, fmt.Errorf("invalid bitsize for integer scalar: %d", bitsize)
}
// MakeUnsignedIntegerScalar is a helper function for creating an unsigned int
// scalar of the specified bit width.
func MakeUnsignedIntegerScalar(v uint64, bitsize int) (Scalar, error) {
switch bitsize {
case 8:
return NewUint8Scalar(uint8(v)), nil
case 16:
return NewUint16Scalar(uint16(v)), nil
case 32:
return NewUint32Scalar(uint32(v)), nil
case 64:
return NewUint64Scalar(uint64(v)), nil
}
return nil, fmt.Errorf("invalid bitsize for uint scalar: %d", bitsize)
}
// ParseScalar parses a string to create a scalar of the passed in type. Currently
// does not support any nested types such as Structs or Lists.
func ParseScalar(dt arrow.DataType, val string) (Scalar, error) {
switch dt.ID() {
case arrow.STRING:
return NewStringScalar(val), nil
case arrow.BINARY:
buf := memory.NewBufferBytes([]byte(val))
defer buf.Release()
return NewBinaryScalar(buf, dt), nil
case arrow.FIXED_SIZE_BINARY:
if len(val) != dt.(*arrow.FixedSizeBinaryType).ByteWidth {
return nil, fmt.Errorf("invalid value %s for scalar of type %s", val, dt)
}
buf := memory.NewBufferBytes([]byte(val))
defer buf.Release()
return NewFixedSizeBinaryScalar(buf, dt), nil
case arrow.BOOL:
val, err := strconv.ParseBool(val)
if err != nil {
return nil, err
}
return NewBooleanScalar(val), nil
case arrow.INT8, arrow.INT16, arrow.INT32, arrow.INT64:
width := dt.(arrow.FixedWidthDataType).BitWidth()
val, err := strconv.ParseInt(val, 0, width)
if err != nil {
return nil, err
}
return MakeIntegerScalar(val, width)
case arrow.UINT8, arrow.UINT16, arrow.UINT32, arrow.UINT64:
width := dt.(arrow.FixedWidthDataType).BitWidth()
val, err := strconv.ParseUint(val, 0, width)
if err != nil {
return nil, err
}
return MakeUnsignedIntegerScalar(val, width)
case arrow.FLOAT16:
val, err := strconv.ParseFloat(val, 32)
if err != nil {
return nil, err
}
return NewFloat16ScalarFromFloat32(float32(val)), nil
case arrow.FLOAT32, arrow.FLOAT64:
width := dt.(arrow.FixedWidthDataType).BitWidth()
val, err := strconv.ParseFloat(val, width)
if err != nil {
return nil, err
}
switch width {
case 32:
return NewFloat32Scalar(float32(val)), nil
case 64:
return NewFloat64Scalar(float64(val)), nil
}
case arrow.TIMESTAMP:
value, err := arrow.TimestampFromString(val, dt.(*arrow.TimestampType).Unit)
if err != nil {
return nil, err
}
return NewTimestampScalar(value, dt), nil
case arrow.DURATION:
value, err := time.ParseDuration(val)
if err != nil {
return nil, err
}
unit := dt.(*arrow.DurationType).Unit
var out arrow.Duration
switch unit {
case arrow.Nanosecond:
out = arrow.Duration(value.Nanoseconds())
case arrow.Microsecond:
out = arrow.Duration(value.Microseconds())
case arrow.Millisecond:
out = arrow.Duration(value.Milliseconds())
case arrow.Second:
out = arrow.Duration(value.Seconds())
}
return NewDurationScalar(out, dt), nil
case arrow.DATE32, arrow.DATE64:
out, err := time.ParseInLocation("2006-01-02", val, time.UTC)
if err != nil {
return nil, err
}
if dt.ID() == arrow.DATE32 {
return NewDate32Scalar(arrow.Date32FromTime(out)), nil
} else {
return NewDate64Scalar(arrow.Date64FromTime(out)), nil
}
case arrow.TIME32:
tm, err := arrow.Time32FromString(val, dt.(*arrow.Time32Type).Unit)
if err != nil {
return nil, err
}
return NewTime32Scalar(tm, dt), nil
case arrow.TIME64:
tm, err := arrow.Time64FromString(val, dt.(*arrow.Time64Type).Unit)
if err != nil {
return nil, err
}
return NewTime64Scalar(tm, dt), nil
case arrow.DICTIONARY:
return ParseScalar(dt.(*arrow.DictionaryType).ValueType, val)
case arrow.DECIMAL128:
typ := dt.(*arrow.Decimal128Type)
n, err := decimal128.FromString(val, typ.Precision, typ.Scale)
if err != nil {
return nil, err
}
return NewDecimal128Scalar(n, typ), nil
case arrow.DECIMAL256:
typ := dt.(*arrow.Decimal256Type)
n, err := decimal256.FromString(val, typ.Precision, typ.Scale)
if err != nil {
return nil, err
}
return NewDecimal256Scalar(n, typ), nil
}
return nil, fmt.Errorf("parsing of scalar for type %s not implemented", dt)
}
|