forked from influxdata/flux
/
keys.go
159 lines (130 loc) · 4.14 KB
/
keys.go
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package universe
import (
"github.com/InfluxCommunity/flux"
"github.com/InfluxCommunity/flux/arrow"
"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"
)
const KeysKind = "keys"
type KeysOpSpec struct {
Column string `json:"column"`
}
func init() {
keysSignature := runtime.MustLookupBuiltinType("universe", "keys")
runtime.RegisterPackageValue("universe", KeysKind, flux.MustValue(flux.FunctionValue(KeysKind, createKeysOpSpec, keysSignature)))
plan.RegisterProcedureSpec(KeysKind, newKeysProcedure, KeysKind)
execute.RegisterTransformation(KeysKind, createKeysTransformation)
}
func createKeysOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
spec := new(KeysOpSpec)
if col, found, err := args.GetString("column"); err != nil {
return nil, err
} else if found {
spec.Column = col
} else {
spec.Column = execute.DefaultValueColLabel
}
return spec, nil
}
func (s *KeysOpSpec) Kind() flux.OperationKind {
return KeysKind
}
type KeysProcedureSpec struct {
plan.DefaultCost
Column string
}
func newKeysProcedure(qs flux.OperationSpec, pa plan.Administration) (plan.ProcedureSpec, error) {
spec, ok := qs.(*KeysOpSpec)
if !ok {
return nil, errors.Newf(codes.Internal, "invalid spec type %T", qs)
}
return &KeysProcedureSpec{
Column: spec.Column,
}, nil
}
func (s *KeysProcedureSpec) Kind() plan.ProcedureKind {
return KeysKind
}
func (s *KeysProcedureSpec) Copy() plan.ProcedureSpec {
ns := new(KeysProcedureSpec)
*ns = *s
return ns
}
// TriggerSpec implements plan.TriggerAwareProcedureSpec
func (s *KeysProcedureSpec) TriggerSpec() plan.TriggerSpec {
return plan.NarrowTransformationTriggerSpec{}
}
func createKeysTransformation(id execute.DatasetID, mode execute.AccumulationMode, spec plan.ProcedureSpec, a execute.Administration) (execute.Transformation, execute.Dataset, error) {
s, ok := spec.(*KeysProcedureSpec)
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 := NewKeysTransformation(d, cache, s)
return t, d, nil
}
type keysTransformation struct {
execute.ExecutionNode
d execute.Dataset
cache execute.TableBuilderCache
column string
}
func NewKeysTransformation(d execute.Dataset, cache execute.TableBuilderCache, spec *KeysProcedureSpec) *keysTransformation {
return &keysTransformation{
d: d,
cache: cache,
column: spec.Column,
}
}
func (t *keysTransformation) RetractTable(id execute.DatasetID, key flux.GroupKey) error {
return t.d.RetractTable(key)
}
func (t *keysTransformation) Process(id execute.DatasetID, tbl flux.Table) error {
builder, created := t.cache.TableBuilder(tbl.Key())
if !created {
return errors.Newf(codes.FailedPrecondition, "keys found duplicate table with key: %v", tbl.Key())
}
keys := make([]string, 0, len(tbl.Cols()))
for _, c := range tbl.Key().Cols() {
keys = append(keys, c.Label)
}
// Add the key to this table.
if err := execute.AddTableKeyCols(tbl.Key(), builder); err != nil {
return err
}
colIdx, err := builder.AddCol(flux.ColMeta{Label: t.column, Type: flux.TString})
if err != nil {
return err
}
// Append the key values repeatedly to the table.
for i := 0; i < len(keys); i++ {
if err := execute.AppendKeyValues(tbl.Key(), builder); err != nil {
return err
}
}
keysArrow := arrow.NewString(keys, nil)
defer keysArrow.Release()
if err := builder.AppendStrings(colIdx, keysArrow); err != nil {
return err
}
// TODO: this is a hack
return tbl.Do(func(flux.ColReader) error {
return nil
})
}
func (t *keysTransformation) UpdateWatermark(id execute.DatasetID, mark execute.Time) error {
return t.d.UpdateWatermark(mark)
}
func (t *keysTransformation) UpdateProcessingTime(id execute.DatasetID, pt execute.Time) error {
return t.d.UpdateProcessingTime(pt)
}
func (t *keysTransformation) Finish(id execute.DatasetID, err error) {
t.d.Finish(err)
}