forked from influxdata/flux
/
mean.go
159 lines (139 loc) · 3.82 KB
/
mean.go
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package universe
import (
"math"
"github.com/InfluxCommunity/flux"
"github.com/InfluxCommunity/flux/array"
"github.com/InfluxCommunity/flux/codes"
"github.com/InfluxCommunity/flux/execute"
"github.com/InfluxCommunity/flux/internal/errors"
"github.com/InfluxCommunity/flux/plan"
"github.com/InfluxCommunity/flux/runtime"
arrowmath "github.com/apache/arrow/go/v7/arrow/math"
)
const MeanKind = "mean"
type MeanOpSpec struct {
execute.SimpleAggregateConfig
}
func init() {
meanSignature := runtime.MustLookupBuiltinType("universe", "mean")
runtime.RegisterPackageValue("universe", MeanKind, flux.MustValue(flux.FunctionValue(MeanKind, CreateMeanOpSpec, meanSignature)))
plan.RegisterProcedureSpec(MeanKind, newMeanProcedure, MeanKind)
execute.RegisterTransformation(MeanKind, createMeanTransformation)
}
func CreateMeanOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
spec := &MeanOpSpec{}
if err := spec.SimpleAggregateConfig.ReadArgs(args); err != nil {
return nil, err
}
return spec, nil
}
func (s *MeanOpSpec) Kind() flux.OperationKind {
return MeanKind
}
type MeanProcedureSpec struct {
execute.SimpleAggregateConfig
}
func newMeanProcedure(qs flux.OperationSpec, a plan.Administration) (plan.ProcedureSpec, error) {
spec, ok := qs.(*MeanOpSpec)
if !ok {
return nil, errors.Newf(codes.Internal, "invalid spec type %T", qs)
}
return &MeanProcedureSpec{
SimpleAggregateConfig: spec.SimpleAggregateConfig,
}, nil
}
func (s *MeanProcedureSpec) Kind() plan.ProcedureKind {
return MeanKind
}
func (s *MeanProcedureSpec) Copy() plan.ProcedureSpec {
return &MeanProcedureSpec{
SimpleAggregateConfig: s.SimpleAggregateConfig,
}
}
// TriggerSpec implements plan.TriggerAwareProcedureSpec
func (s *MeanProcedureSpec) TriggerSpec() plan.TriggerSpec {
return plan.NarrowTransformationTriggerSpec{}
}
type MeanAgg struct {
count int64
sum float64
}
func createMeanTransformation(id execute.DatasetID, mode execute.AccumulationMode, spec plan.ProcedureSpec, a execute.Administration) (execute.Transformation, execute.Dataset, error) {
s, ok := spec.(*MeanProcedureSpec)
if !ok {
return nil, nil, errors.Newf(codes.Internal, "invalid spec type %T", spec)
}
return execute.NewSimpleAggregateTransformation(a.Context(), id, new(MeanAgg), s.SimpleAggregateConfig, a.Allocator())
}
func (a *MeanAgg) NewBoolAgg() execute.DoBoolAgg {
return nil
}
func (a *MeanAgg) NewIntAgg() execute.DoIntAgg {
return new(MeanAgg)
}
func (a *MeanAgg) NewUIntAgg() execute.DoUIntAgg {
return new(MeanAgg)
}
func (a *MeanAgg) NewFloatAgg() execute.DoFloatAgg {
return new(MeanAgg)
}
func (a *MeanAgg) NewStringAgg() execute.DoStringAgg {
return nil
}
func (a *MeanAgg) DoInt(vs *array.Int) {
if l := vs.Len() - vs.NullN(); l > 0 {
a.count += int64(l)
if vs.NullN() == 0 {
a.sum += float64(arrowmath.Int64.Sum(vs))
} else {
for i := 0; i < vs.Len(); i++ {
if vs.IsValid(i) {
a.sum += float64(vs.Value(i))
}
}
}
}
}
func (a *MeanAgg) DoUInt(vs *array.Uint) {
if l := vs.Len() - vs.NullN(); l > 0 {
a.count += int64(l)
if vs.NullN() == 0 {
a.sum += float64(arrowmath.Uint64.Sum(vs))
} else {
for i := 0; i < vs.Len(); i++ {
if vs.IsValid(i) {
a.sum += float64(vs.Value(i))
}
}
}
}
}
func (a *MeanAgg) DoFloat(vs *array.Float) {
if l := vs.Len() - vs.NullN(); l > 0 {
a.count += int64(l)
if vs.NullN() == 0 {
a.sum += arrowmath.Float64.Sum(vs)
} else {
for i := 0; i < vs.Len(); i++ {
if vs.IsValid(i) {
a.sum += float64(vs.Value(i))
}
}
}
}
}
func (a *MeanAgg) Type() flux.ColType {
return flux.TFloat
}
func (a *MeanAgg) ValueFloat() float64 {
if a.count < 1 {
return math.NaN()
}
return a.sum / float64(a.count)
}
func (a *MeanAgg) IsNull() bool {
return a.count == 0
}