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cumulative_sum.go
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/
cumulative_sum.go
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package universe
import (
"fmt"
"github.com/influxdata/flux"
"github.com/influxdata/flux/execute"
"github.com/influxdata/flux/interpreter"
"github.com/influxdata/flux/plan"
"github.com/influxdata/flux/semantic"
)
const CumulativeSumKind = "cumulativeSum"
type CumulativeSumOpSpec struct {
Columns []string `json:"columns"`
}
func init() {
cumulativeSumSignature := flux.FunctionSignature(
map[string]semantic.PolyType{
"columns": semantic.NewArrayPolyType(semantic.String),
},
nil,
)
flux.RegisterPackageValue("universe", CumulativeSumKind, flux.FunctionValue(CumulativeSumKind, createCumulativeSumOpSpec, cumulativeSumSignature))
flux.RegisterOpSpec(CumulativeSumKind, newCumulativeSumOp)
plan.RegisterProcedureSpec(CumulativeSumKind, newCumulativeSumProcedure, CumulativeSumKind)
execute.RegisterTransformation(CumulativeSumKind, createCumulativeSumTransformation)
}
func createCumulativeSumOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
spec := new(CumulativeSumOpSpec)
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}
}
return spec, nil
}
func newCumulativeSumOp() flux.OperationSpec {
return new(CumulativeSumOpSpec)
}
func (s *CumulativeSumOpSpec) Kind() flux.OperationKind {
return CumulativeSumKind
}
type CumulativeSumProcedureSpec struct {
plan.DefaultCost
Columns []string
}
func newCumulativeSumProcedure(qs flux.OperationSpec, pa plan.Administration) (plan.ProcedureSpec, error) {
spec, ok := qs.(*CumulativeSumOpSpec)
if !ok {
return nil, fmt.Errorf("invalid spec type %T", qs)
}
return &CumulativeSumProcedureSpec{
Columns: spec.Columns,
}, nil
}
func (s *CumulativeSumProcedureSpec) Kind() plan.ProcedureKind {
return CumulativeSumKind
}
func (s *CumulativeSumProcedureSpec) Copy() plan.ProcedureSpec {
ns := new(CumulativeSumProcedureSpec)
*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 *CumulativeSumProcedureSpec) TriggerSpec() plan.TriggerSpec {
return plan.NarrowTransformationTriggerSpec{}
}
func createCumulativeSumTransformation(id execute.DatasetID, mode execute.AccumulationMode, spec plan.ProcedureSpec, a execute.Administration) (execute.Transformation, execute.Dataset, error) {
s, ok := spec.(*CumulativeSumProcedureSpec)
if !ok {
return nil, nil, fmt.Errorf("invalid spec type %T", spec)
}
cache := execute.NewTableBuilderCache(a.Allocator())
d := execute.NewDataset(id, mode, cache)
t := NewCumulativeSumTransformation(d, cache, s)
return t, d, nil
}
type cumulativeSumTransformation struct {
d execute.Dataset
cache execute.TableBuilderCache
spec CumulativeSumProcedureSpec
}
func NewCumulativeSumTransformation(d execute.Dataset, cache execute.TableBuilderCache, spec *CumulativeSumProcedureSpec) *cumulativeSumTransformation {
return &cumulativeSumTransformation{
d: d,
cache: cache,
spec: *spec,
}
}
func (t *cumulativeSumTransformation) RetractTable(id execute.DatasetID, key flux.GroupKey) error {
return t.d.RetractTable(key)
}
func (t *cumulativeSumTransformation) Process(id execute.DatasetID, tbl flux.Table) error {
builder, created := t.cache.TableBuilder(tbl.Key())
if !created {
return fmt.Errorf("cumulative sum found duplicate table with key: %v", tbl.Key())
}
if err := execute.AddTableCols(tbl, builder); err != nil {
return err
}
cols := tbl.Cols()
sumers := make([]*cumulativeSum, len(cols))
for j, c := range cols {
for _, label := range t.spec.Columns {
if c.Label == label {
sumers[j] = &cumulativeSum{}
break
}
}
}
return tbl.Do(func(cr flux.ColReader) error {
l := cr.Len()
for j, c := range cols {
switch c.Type {
case flux.TBool:
for i := 0; i < l; i++ {
if err := builder.AppendBool(j, cr.Bools(j).Value(i)); err != nil {
return err
}
}
case flux.TInt:
if sumers[j] != nil {
for i := 0; i < l; i++ {
if vs := cr.Ints(j); vs.IsValid(i) {
sumers[j].sumInt(vs.Value(i))
}
if err := builder.AppendInt(j, sumers[j].intVal); err != nil {
return err
}
}
} else {
if err := builder.AppendInts(j, cr.Ints(j)); err != nil {
return err
}
}
case flux.TUInt:
if sumers[j] != nil {
for i := 0; i < l; i++ {
if vs := cr.UInts(j); vs.IsValid(i) {
sumers[j].sumUInt(vs.Value(i))
}
if err := builder.AppendUInt(j, sumers[j].uintVal); err != nil {
return err
}
}
} else {
if err := builder.AppendUInts(j, cr.UInts(j)); err != nil {
return err
}
}
case flux.TFloat:
if sumers[j] != nil {
for i := 0; i < l; i++ {
if vs := cr.Floats(j); vs.IsValid(i) {
sumers[j].sumFloat(vs.Value(i))
}
if err := builder.AppendFloat(j, sumers[j].floatVal); err != nil {
return err
}
}
} else {
if err := builder.AppendFloats(j, cr.Floats(j)); err != nil {
return err
}
}
case flux.TString:
for i := 0; i < l; i++ {
if err := builder.AppendString(j, cr.Strings(j).ValueString(i)); err != nil {
return err
}
}
case flux.TTime:
for i := 0; i < l; i++ {
if err := builder.AppendTime(j, execute.Time(cr.Times(j).Value(i))); err != nil {
return err
}
}
}
}
return nil
})
}
func (t *cumulativeSumTransformation) UpdateWatermark(id execute.DatasetID, mark execute.Time) error {
return t.d.UpdateWatermark(mark)
}
func (t *cumulativeSumTransformation) UpdateProcessingTime(id execute.DatasetID, pt execute.Time) error {
return t.d.UpdateProcessingTime(pt)
}
func (t *cumulativeSumTransformation) Finish(id execute.DatasetID, err error) {
t.d.Finish(err)
}
type cumulativeSum struct {
intVal int64
uintVal uint64
floatVal float64
}
func (s *cumulativeSum) sumInt(val int64) int64 {
s.intVal += val
return s.intVal
}
func (s *cumulativeSum) sumUInt(val uint64) uint64 {
s.uintVal += val
return s.uintVal
}
func (s *cumulativeSum) sumFloat(val float64) float64 {
s.floatVal += val
return s.floatVal
}