/
utils.go
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/
utils.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.
//go:build go1.18
package compute
import (
"fmt"
"io"
"math"
"time"
"github.com/apache/arrow/go/v17/arrow"
"github.com/apache/arrow/go/v17/arrow/bitutil"
"github.com/apache/arrow/go/v17/arrow/compute/exec"
"github.com/apache/arrow/go/v17/arrow/compute/internal/kernels"
"github.com/apache/arrow/go/v17/arrow/internal/debug"
"github.com/apache/arrow/go/v17/arrow/memory"
"golang.org/x/xerrors"
)
type bufferWriteSeeker struct {
buf *memory.Buffer
pos int
mem memory.Allocator
}
func (b *bufferWriteSeeker) Reserve(nbytes int) {
if b.buf == nil {
b.buf = memory.NewResizableBuffer(b.mem)
}
newCap := int(math.Max(float64(b.buf.Cap()), 256))
for newCap < b.pos+nbytes {
newCap = bitutil.NextPowerOf2(newCap)
}
b.buf.Reserve(newCap)
}
func (b *bufferWriteSeeker) Write(p []byte) (n int, err error) {
if len(p) == 0 {
return 0, nil
}
if b.buf == nil {
b.Reserve(len(p))
} else if b.pos+len(p) >= b.buf.Cap() {
b.Reserve(len(p))
}
return b.UnsafeWrite(p)
}
func (b *bufferWriteSeeker) UnsafeWrite(p []byte) (n int, err error) {
n = copy(b.buf.Buf()[b.pos:], p)
b.pos += len(p)
if b.pos > b.buf.Len() {
b.buf.ResizeNoShrink(b.pos)
}
return
}
func (b *bufferWriteSeeker) Seek(offset int64, whence int) (int64, error) {
newpos, offs := 0, int(offset)
switch whence {
case io.SeekStart:
newpos = offs
case io.SeekCurrent:
newpos = b.pos + offs
case io.SeekEnd:
newpos = b.buf.Len() + offs
}
if newpos < 0 {
return 0, xerrors.New("negative result pos")
}
b.pos = newpos
return int64(newpos), nil
}
// ensureDictionaryDecoded is used by DispatchBest to determine
// the proper types for promotion. Casting is then performed by
// the executor before continuing execution: see the implementation
// of execInternal in exec.go after calling DispatchBest.
//
// That casting is where actual decoding would be performed for
// the dictionary
func ensureDictionaryDecoded(vals ...arrow.DataType) {
for i, v := range vals {
if v.ID() == arrow.DICTIONARY {
vals[i] = v.(*arrow.DictionaryType).ValueType
}
}
}
func replaceNullWithOtherType(vals ...arrow.DataType) {
debug.Assert(len(vals) == 2, "should be length 2")
if vals[0].ID() == arrow.NULL {
vals[0] = vals[1]
return
}
if vals[1].ID() == arrow.NULL {
vals[1] = vals[0]
return
}
}
func commonTemporalResolution(vals ...arrow.DataType) (arrow.TimeUnit, bool) {
isTimeUnit := false
finestUnit := arrow.Second
for _, v := range vals {
switch dt := v.(type) {
case *arrow.Date32Type:
isTimeUnit = true
continue
case *arrow.Date64Type:
finestUnit = exec.Max(finestUnit, arrow.Millisecond)
isTimeUnit = true
case arrow.TemporalWithUnit:
finestUnit = exec.Max(finestUnit, dt.TimeUnit())
isTimeUnit = true
default:
continue
}
}
return finestUnit, isTimeUnit
}
func replaceTemporalTypes(unit arrow.TimeUnit, vals ...arrow.DataType) {
for i, v := range vals {
switch dt := v.(type) {
case *arrow.TimestampType:
dt.Unit = unit
vals[i] = dt
case *arrow.Time32Type, *arrow.Time64Type:
if unit > arrow.Millisecond {
vals[i] = &arrow.Time64Type{Unit: unit}
} else {
vals[i] = &arrow.Time32Type{Unit: unit}
}
case *arrow.DurationType:
dt.Unit = unit
vals[i] = dt
case *arrow.Date32Type, *arrow.Date64Type:
vals[i] = &arrow.TimestampType{Unit: unit}
}
}
}
func replaceTypes(replacement arrow.DataType, vals ...arrow.DataType) {
for i := range vals {
vals[i] = replacement
}
}
func commonNumeric(vals ...arrow.DataType) arrow.DataType {
for _, v := range vals {
if !arrow.IsFloating(v.ID()) && !arrow.IsInteger(v.ID()) {
// a common numeric type is only possible if all are numeric
return nil
}
if v.ID() == arrow.FLOAT16 {
// float16 arithmetic is not currently supported
return nil
}
}
for _, v := range vals {
if v.ID() == arrow.FLOAT64 {
return arrow.PrimitiveTypes.Float64
}
}
for _, v := range vals {
if v.ID() == arrow.FLOAT32 {
return arrow.PrimitiveTypes.Float32
}
}
maxWidthSigned, maxWidthUnsigned := 0, 0
for _, v := range vals {
if arrow.IsUnsignedInteger(v.ID()) {
maxWidthUnsigned = exec.Max(v.(arrow.FixedWidthDataType).BitWidth(), maxWidthUnsigned)
} else {
maxWidthSigned = exec.Max(v.(arrow.FixedWidthDataType).BitWidth(), maxWidthSigned)
}
}
if maxWidthSigned == 0 {
switch {
case maxWidthUnsigned >= 64:
return arrow.PrimitiveTypes.Uint64
case maxWidthUnsigned == 32:
return arrow.PrimitiveTypes.Uint32
case maxWidthUnsigned == 16:
return arrow.PrimitiveTypes.Uint16
default:
debug.Assert(maxWidthUnsigned == 8, "bad maxWidthUnsigned")
return arrow.PrimitiveTypes.Uint8
}
}
if maxWidthSigned <= maxWidthUnsigned {
maxWidthSigned = bitutil.NextPowerOf2(maxWidthUnsigned + 1)
}
switch {
case maxWidthSigned >= 64:
return arrow.PrimitiveTypes.Int64
case maxWidthSigned == 32:
return arrow.PrimitiveTypes.Int32
case maxWidthSigned == 16:
return arrow.PrimitiveTypes.Int16
default:
debug.Assert(maxWidthSigned == 8, "bad maxWidthSigned")
return arrow.PrimitiveTypes.Int8
}
}
func hasDecimal(vals ...arrow.DataType) bool {
for _, v := range vals {
if arrow.IsDecimal(v.ID()) {
return true
}
}
return false
}
type decimalPromotion uint8
const (
decPromoteNone decimalPromotion = iota
decPromoteAdd
decPromoteMultiply
decPromoteDivide
)
func castBinaryDecimalArgs(promote decimalPromotion, vals ...arrow.DataType) error {
left, right := vals[0], vals[1]
debug.Assert(arrow.IsDecimal(left.ID()) || arrow.IsDecimal(right.ID()), "at least one of the types should be decimal")
// decimal + float = float
if arrow.IsFloating(left.ID()) {
vals[1] = vals[0]
return nil
} else if arrow.IsFloating(right.ID()) {
vals[0] = vals[1]
return nil
}
var prec1, scale1, prec2, scale2 int32
var err error
// decimal + integer = decimal
if arrow.IsDecimal(left.ID()) {
dec := left.(arrow.DecimalType)
prec1, scale1 = dec.GetPrecision(), dec.GetScale()
} else {
debug.Assert(arrow.IsInteger(left.ID()), "floats were already handled, this should be an int")
if prec1, err = kernels.MaxDecimalDigitsForInt(left.ID()); err != nil {
return err
}
}
if arrow.IsDecimal(right.ID()) {
dec := right.(arrow.DecimalType)
prec2, scale2 = dec.GetPrecision(), dec.GetScale()
} else {
debug.Assert(arrow.IsInteger(right.ID()), "float already handled, should be ints")
if prec2, err = kernels.MaxDecimalDigitsForInt(right.ID()); err != nil {
return err
}
}
if scale1 < 0 || scale2 < 0 {
return fmt.Errorf("%w: decimals with negative scales not supported", arrow.ErrNotImplemented)
}
// decimal128 + decimal256 = decimal256
castedID := arrow.DECIMAL128
if left.ID() == arrow.DECIMAL256 || right.ID() == arrow.DECIMAL256 {
castedID = arrow.DECIMAL256
}
// decimal promotion rules compatible with amazon redshift
// https://docs.aws.amazon.com/redshift/latest/dg/r_numeric_computations201.html
var leftScaleup, rightScaleup int32
switch promote {
case decPromoteAdd:
leftScaleup = exec.Max(scale1, scale2) - scale1
rightScaleup = exec.Max(scale1, scale2) - scale2
case decPromoteMultiply:
case decPromoteDivide:
leftScaleup = exec.Max(4, scale1+prec2-scale2+1) + scale2 - scale1
default:
debug.Assert(false, fmt.Sprintf("invalid DecimalPromotion value %d", promote))
}
vals[0], err = arrow.NewDecimalType(castedID, prec1+leftScaleup, scale1+leftScaleup)
if err != nil {
return err
}
vals[1], err = arrow.NewDecimalType(castedID, prec2+rightScaleup, scale2+rightScaleup)
return err
}
func commonTemporal(vals ...arrow.DataType) arrow.DataType {
var (
finestUnit = arrow.Second
zone *string
loc *time.Location
sawDate32, sawDate64 bool
)
for _, ty := range vals {
switch ty.ID() {
case arrow.DATE32:
// date32's unit is days, but the coarsest we have is seconds
sawDate32 = true
case arrow.DATE64:
finestUnit = exec.Max(finestUnit, arrow.Millisecond)
sawDate64 = true
case arrow.TIMESTAMP:
ts := ty.(*arrow.TimestampType)
if ts.TimeZone != "" {
tz, _ := ts.GetZone()
if loc != nil && loc != tz {
return nil
}
loc = tz
}
zone = &ts.TimeZone
finestUnit = exec.Max(finestUnit, ts.Unit)
default:
return nil
}
}
switch {
case zone != nil:
// at least one timestamp seen
return &arrow.TimestampType{Unit: finestUnit, TimeZone: *zone}
case sawDate64:
return arrow.FixedWidthTypes.Date64
case sawDate32:
return arrow.FixedWidthTypes.Date32
}
return nil
}
func commonBinary(vals ...arrow.DataType) arrow.DataType {
var (
allUTF8, allOffset32, allFixedWidth = true, true, true
)
for _, ty := range vals {
switch ty.ID() {
case arrow.STRING:
allFixedWidth = false
case arrow.BINARY:
allFixedWidth, allUTF8 = false, false
case arrow.FIXED_SIZE_BINARY:
allUTF8 = false
case arrow.LARGE_BINARY:
allOffset32, allFixedWidth, allUTF8 = false, false, false
case arrow.LARGE_STRING:
allOffset32, allFixedWidth = false, false
default:
return nil
}
}
switch {
case allFixedWidth:
// at least for the purposes of comparison, no need to cast
return nil
case allUTF8:
if allOffset32 {
return arrow.BinaryTypes.String
}
return arrow.BinaryTypes.LargeString
case allOffset32:
return arrow.BinaryTypes.Binary
}
return arrow.BinaryTypes.LargeBinary
}