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group.go
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group.go
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package experimental
import (
"fmt"
"sort"
"github.com/influxdata/flux"
"github.com/influxdata/flux/codes"
"github.com/influxdata/flux/execute"
"github.com/influxdata/flux/internal/errors"
"github.com/influxdata/flux/interpreter"
"github.com/influxdata/flux/plan"
"github.com/influxdata/flux/runtime"
"github.com/influxdata/flux/semantic"
)
const ExperimentalGroupKind = "experimental-group"
const (
groupModeExtend = "extend"
)
// GroupOpSpec in package experimental defines a special group() function
// that has just one mode called "extend", which adds additional columns to the group key.
// This is a workaround until schema introspection is implemented:
// https://github.com/influxdata/flux/issues/27
// Most of this code has simply been copied from stdlib/universe/group.go
type GroupOpSpec struct {
Mode string `json:"mode"`
Columns []string `json:"columns"`
}
func init() {
groupSignature := runtime.MustLookupBuiltinType("experimental", "group")
runtime.RegisterPackageValue("experimental", "group", flux.MustValue(flux.FunctionValue("group", createGroupOpSpec, groupSignature)))
flux.RegisterOpSpec(ExperimentalGroupKind, newGroupOp)
plan.RegisterProcedureSpec(ExperimentalGroupKind, newGroupProcedure, ExperimentalGroupKind)
execute.RegisterTransformation(ExperimentalGroupKind, createGroupTransformation)
}
func createGroupOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
spec := new(GroupOpSpec)
if mode, err := args.GetRequiredString("mode"); err != nil {
return nil, err
} else if mode != groupModeExtend {
return nil, errors.New(
codes.Invalid,
fmt.Sprintf(`invalid group mode %q; experimental.group requires mode %q`, mode, groupModeExtend),
)
} else {
spec.Mode = mode
}
if columns, ok, err := args.GetArray("columns", semantic.String); err != nil {
return nil, err
} else if ok {
spec.Columns, err = interpreter.ToStringArray(columns)
if err != nil {
return nil, err
}
} else {
spec.Columns = []string{}
}
return spec, nil
}
func newGroupOp() flux.OperationSpec {
return new(GroupOpSpec)
}
func (s *GroupOpSpec) Kind() flux.OperationKind {
return ExperimentalGroupKind
}
type GroupProcedureSpec struct {
plan.DefaultCost
GroupKeys []string
}
func newGroupProcedure(qs flux.OperationSpec, pa plan.Administration) (plan.ProcedureSpec, error) {
spec, ok := qs.(*GroupOpSpec)
if !ok {
return nil, errors.Newf(codes.Internal, "invalid spec type %T", qs)
}
p := &GroupProcedureSpec{
GroupKeys: spec.Columns,
}
return p, nil
}
func (s *GroupProcedureSpec) Kind() plan.ProcedureKind {
return ExperimentalGroupKind
}
func (s *GroupProcedureSpec) Copy() plan.ProcedureSpec {
ns := new(GroupProcedureSpec)
ns.GroupKeys = make([]string, len(s.GroupKeys))
copy(ns.GroupKeys, s.GroupKeys)
return ns
}
func createGroupTransformation(id execute.DatasetID, mode execute.AccumulationMode, spec plan.ProcedureSpec, a execute.Administration) (execute.Transformation, execute.Dataset, error) {
s, ok := spec.(*GroupProcedureSpec)
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 := NewGroupTransformation(d, cache, s)
return t, d, nil
}
type groupTransformation struct {
execute.ExecutionNode
d execute.Dataset
cache execute.TableBuilderCache
keys []string
}
func NewGroupTransformation(d execute.Dataset, cache execute.TableBuilderCache, spec *GroupProcedureSpec) *groupTransformation {
t := &groupTransformation{
d: d,
cache: cache,
keys: spec.GroupKeys,
}
sort.Strings(t.keys)
return t
}
func (t *groupTransformation) RetractTable(id execute.DatasetID, key flux.GroupKey) (err error) {
panic("not implemented")
}
func (t *groupTransformation) Process(id execute.DatasetID, tbl flux.Table) error {
cols := tbl.Cols()
on := make(map[string]bool, len(cols))
for _, k := range tbl.Key().Cols() {
on[k.Label] = true
}
for _, c := range t.keys {
if execute.ColIdx(c, cols) < 0 {
return errors.New(codes.Invalid, fmt.Sprintf("unknown column %q", c))
}
on[c] = true
}
colMap := make([]int, 0, len(tbl.Cols()))
return tbl.Do(func(cr flux.ColReader) error {
l := cr.Len()
for i := 0; i < l; i++ {
key := execute.GroupKeyForRowOn(i, cr, on)
builder, _ := t.cache.TableBuilder(key)
colMap, err := execute.AddNewTableCols(tbl, builder, colMap)
if err != nil {
return err
}
err = execute.AppendMappedRecordWithNulls(i, cr, builder, colMap)
if err != nil {
return err
}
}
return nil
})
}
func (t *groupTransformation) UpdateWatermark(id execute.DatasetID, mark execute.Time) error {
return t.d.UpdateWatermark(mark)
}
func (t *groupTransformation) UpdateProcessingTime(id execute.DatasetID, pt execute.Time) error {
return t.d.UpdateProcessingTime(pt)
}
func (t *groupTransformation) Finish(id execute.DatasetID, err error) {
t.d.Finish(err)
}