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difference.go
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difference.go
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package universe
import (
"math"
"github.com/wolffcm/flux"
"github.com/wolffcm/flux/arrow"
"github.com/wolffcm/flux/codes"
"github.com/wolffcm/flux/execute"
"github.com/wolffcm/flux/internal/errors"
"github.com/wolffcm/flux/interpreter"
"github.com/wolffcm/flux/plan"
"github.com/wolffcm/flux/runtime"
"github.com/wolffcm/flux/semantic"
)
const DifferenceKind = "difference"
type DifferenceOpSpec struct {
NonNegative bool `json:"nonNegative"`
Columns []string `json:"columns"`
KeepFirst bool `json:"keepFirst"`
}
func init() {
differenceSignature := runtime.MustLookupBuiltinType("universe", "difference")
runtime.RegisterPackageValue("universe", DifferenceKind, flux.MustValue(flux.FunctionValue(DifferenceKind, createDifferenceOpSpec, differenceSignature)))
flux.RegisterOpSpec(DifferenceKind, newDifferenceOp)
plan.RegisterProcedureSpec(DifferenceKind, newDifferenceProcedure, DifferenceKind)
execute.RegisterTransformation(DifferenceKind, createDifferenceTransformation)
}
func createDifferenceOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
spec := new(DifferenceOpSpec)
if nn, ok, err := args.GetBool("nonNegative"); err != nil {
return nil, err
} else if ok {
spec.NonNegative = nn
}
if cols, ok, err := args.GetArray("columns", semantic.String); err != nil {
return nil, err
} else if ok {
columns, err := interpreter.ToStringArray(cols)
if err != nil {
return nil, err
}
spec.Columns = columns
} else {
spec.Columns = []string{execute.DefaultValueColLabel}
}
if keepFirst, ok, err := args.GetBool("keepFirst"); err != nil {
return nil, err
} else if ok {
spec.KeepFirst = keepFirst
} else {
spec.KeepFirst = false
}
return spec, nil
}
func newDifferenceOp() flux.OperationSpec {
return new(DifferenceOpSpec)
}
func (s *DifferenceOpSpec) Kind() flux.OperationKind {
return DifferenceKind
}
type DifferenceProcedureSpec struct {
plan.DefaultCost
NonNegative bool `json:"non_negative"`
Columns []string `json:"columns"`
KeepFirst bool `json:"keepFirst"`
}
func newDifferenceProcedure(qs flux.OperationSpec, pa plan.Administration) (plan.ProcedureSpec, error) {
spec, ok := qs.(*DifferenceOpSpec)
if !ok {
return nil, errors.Newf(codes.Internal, "invalid spec type %T", qs)
}
return &DifferenceProcedureSpec{
NonNegative: spec.NonNegative,
Columns: spec.Columns,
KeepFirst: spec.KeepFirst,
}, nil
}
func (s *DifferenceProcedureSpec) Kind() plan.ProcedureKind {
return DifferenceKind
}
func (s *DifferenceProcedureSpec) Copy() plan.ProcedureSpec {
ns := new(DifferenceProcedureSpec)
*ns = *s
if s.Columns != nil {
ns.Columns = make([]string, len(s.Columns))
copy(ns.Columns, s.Columns)
}
return ns
}
// TriggerSpec implements plan.TriggerAwareProcedureSpec
func (s *DifferenceProcedureSpec) TriggerSpec() plan.TriggerSpec {
return plan.NarrowTransformationTriggerSpec{}
}
func createDifferenceTransformation(id execute.DatasetID, mode execute.AccumulationMode, spec plan.ProcedureSpec, a execute.Administration) (execute.Transformation, execute.Dataset, error) {
s, ok := spec.(*DifferenceProcedureSpec)
if !ok {
return nil, nil, errors.Newf(codes.Internal, "invalid spec type %T", spec)
}
cache := execute.NewTableBuilderCache(a.Allocator())
d := execute.NewDataset(id, mode, cache)
t := NewDifferenceTransformation(d, cache, s)
return t, d, nil
}
type differenceTransformation struct {
d execute.Dataset
cache execute.TableBuilderCache
nonNegative bool
columns []string
keepFirst bool
}
func NewDifferenceTransformation(d execute.Dataset, cache execute.TableBuilderCache, spec *DifferenceProcedureSpec) *differenceTransformation {
return &differenceTransformation{
d: d,
cache: cache,
nonNegative: spec.NonNegative,
columns: spec.Columns,
keepFirst: spec.KeepFirst,
}
}
func (t *differenceTransformation) RetractTable(id execute.DatasetID, key flux.GroupKey) error {
return t.d.RetractTable(key)
}
func (t *differenceTransformation) Process(id execute.DatasetID, tbl flux.Table) error {
builder, created := t.cache.TableBuilder(tbl.Key())
if !created {
return errors.Newf(codes.FailedPrecondition, "difference found duplicate table with key: %v", tbl.Key())
}
cols := tbl.Cols()
differences := make([]*difference, len(cols))
for j, c := range cols {
found := false
for _, label := range t.columns {
if c.Label == label {
found = true
break
}
}
if found {
var typ flux.ColType
switch c.Type {
case flux.TInt, flux.TUInt:
typ = flux.TInt
case flux.TFloat:
typ = flux.TFloat
case flux.TTime:
return errors.New(codes.FailedPrecondition, "difference does not support time columns. Try the elapsed function")
}
if _, err := builder.AddCol(flux.ColMeta{
Label: c.Label,
Type: typ,
}); err != nil {
return err
}
differences[j] = newDifference(j, t.nonNegative, t.keepFirst)
} else {
_, err := builder.AddCol(c)
if err != nil {
return err
}
}
}
// We need to drop the first row since its difference is undefined
firstIdx := 1
if t.keepFirst {
// Unless the user wants to keep the first row
firstIdx = 0
}
return tbl.Do(func(cr flux.ColReader) error {
l := cr.Len()
if l != 0 {
for j, c := range cols {
d := differences[j]
switch c.Type {
case flux.TBool:
s := arrow.BoolSlice(cr.Bools(j), firstIdx, l)
if err := builder.AppendBools(j, s); err != nil {
s.Release()
return err
}
s.Release()
case flux.TInt:
if d != nil {
for i := 0; i < l; i++ {
if vs := cr.Ints(j); vs.IsValid(i) {
if d.checkKeepFirst() {
if err := builder.AppendNil(j); err != nil {
return err
}
}
if v, first := d.updateInt(vs.Value(i)); !first {
if d.nonNegative && v < 0 {
if err := builder.AppendNil(j); err != nil {
return err
}
} else {
if err := builder.AppendInt(j, v); err != nil {
return err
}
}
}
} else if err := builder.AppendNil(j); err != nil {
return err
}
}
} else {
s := arrow.IntSlice(cr.Ints(j), firstIdx, l)
if err := builder.AppendInts(j, s); err != nil {
s.Release()
return err
}
s.Release()
}
case flux.TUInt:
if d != nil {
for i := 0; i < l; i++ {
if vs := cr.UInts(j); vs.IsValid(i) {
if d.checkKeepFirst() {
if err := builder.AppendNil(j); err != nil {
return err
}
}
if v, first := d.updateUInt(vs.Value(i)); !first {
if d.nonNegative && v < 0 {
if err := builder.AppendNil(j); err != nil {
return err
}
} else {
if err := builder.AppendInt(j, v); err != nil {
return err
}
}
}
} else if err := builder.AppendNil(j); err != nil {
return err
}
}
} else {
s := arrow.UintSlice(cr.UInts(j), firstIdx, l)
if err := builder.AppendUInts(j, s); err != nil {
s.Release()
return err
}
s.Release()
}
case flux.TFloat:
if d != nil {
for i := 0; i < l; i++ {
if vs := cr.Floats(j); vs.IsValid(i) {
if d.checkKeepFirst() {
if err := builder.AppendNil(j); err != nil {
return err
}
}
if v, first := d.updateFloat(vs.Value(i)); !first {
if d.nonNegative && v < 0 {
if err := builder.AppendNil(j); err != nil {
return err
}
} else {
if err := builder.AppendFloat(j, v); err != nil {
return err
}
}
}
} else if err := builder.AppendNil(j); err != nil {
return err
}
}
} else {
s := arrow.FloatSlice(cr.Floats(j), firstIdx, l)
if err := builder.AppendFloats(j, s); err != nil {
s.Release()
return err
}
s.Release()
}
case flux.TString:
s := arrow.StringSlice(cr.Strings(j), firstIdx, l)
if err := builder.AppendStrings(j, s); err != nil {
s.Release()
return err
}
s.Release()
case flux.TTime:
s := arrow.IntSlice(cr.Times(j), firstIdx, l)
if err := builder.AppendTimes(j, s); err != nil {
s.Release()
return err
}
s.Release()
}
}
}
// Now that we skipped the first row, start at 0 for the rest of the batches
firstIdx = 0
return nil
})
}
func (t *differenceTransformation) UpdateWatermark(id execute.DatasetID, mark execute.Time) error {
return t.d.UpdateWatermark(mark)
}
func (t *differenceTransformation) UpdateProcessingTime(id execute.DatasetID, pt execute.Time) error {
return t.d.UpdateProcessingTime(pt)
}
func (t *differenceTransformation) Finish(id execute.DatasetID, err error) {
t.d.Finish(err)
}
func newDifference(col int, nonNegative bool, keepFirst bool) *difference {
return &difference{
col: col,
first: true,
nonNegative: nonNegative,
keepFirst: keepFirst,
}
}
type difference struct {
col int
first bool
nonNegative bool
keepFirst bool
pIntValue int64
pUIntValue uint64
pFloatValue float64
}
func (d *difference) updateInt(v int64) (int64, bool) {
if d.first {
d.pIntValue = v
d.first = false
return 0, true
}
diff := v - d.pIntValue
d.pIntValue = v
return diff, false
}
func (d *difference) updateUInt(v uint64) (int64, bool) {
if d.first {
d.pUIntValue = v
d.first = false
return 0, true
}
var diff int64
if d.pUIntValue > v {
// Prevent uint64 overflow by applying the negative sign after the conversion to an int64.
diff = int64(d.pUIntValue-v) * -1
} else {
diff = int64(v - d.pUIntValue)
}
d.pUIntValue = v
return diff, false
}
func (d *difference) updateFloat(v float64) (float64, bool) {
if d.first {
d.pFloatValue = v
d.first = false
return math.NaN(), true
}
diff := v - d.pFloatValue
d.pFloatValue = v
return diff, false
}
func (d *difference) checkKeepFirst() bool {
c := d.keepFirst
d.keepFirst = false
return c
}