forked from influxdata/flux
/
schema_functions.go
513 lines (435 loc) · 12.9 KB
/
schema_functions.go
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package universe
import (
"context"
"github.com/InfluxCommunity/flux"
"github.com/InfluxCommunity/flux/array"
"github.com/InfluxCommunity/flux/arrow"
"github.com/InfluxCommunity/flux/codes"
"github.com/InfluxCommunity/flux/execute"
"github.com/InfluxCommunity/flux/execute/table"
"github.com/InfluxCommunity/flux/internal/errors"
"github.com/InfluxCommunity/flux/internal/execute/dataset"
"github.com/InfluxCommunity/flux/interpreter"
"github.com/InfluxCommunity/flux/memory"
"github.com/InfluxCommunity/flux/plan"
"github.com/InfluxCommunity/flux/runtime"
"github.com/InfluxCommunity/flux/semantic"
"github.com/InfluxCommunity/flux/values"
)
const RenameKind = "rename"
const DropKind = "drop"
const KeepKind = "keep"
const DuplicateKind = "duplicate"
type RenameOpSpec struct {
Columns map[string]string `json:"columns"`
Fn interpreter.ResolvedFunction `json:"fn"`
}
type DropOpSpec struct {
Columns []string `json:"columns"`
Predicate interpreter.ResolvedFunction `json:"fn"`
}
type KeepOpSpec struct {
Columns []string `json:"columns"`
Predicate interpreter.ResolvedFunction `json:"fn"`
}
type DuplicateOpSpec struct {
Column string `json:"columns"`
As string `json:"as"`
}
// The base kind for SchemaMutations
const SchemaMutationKind = "SchemaMutation"
// A list of all operations which should map to the SchemaMutationProcedure
// Added to dynamically upon calls to `Register()`
var SchemaMutationOps = []flux.OperationKind{}
// A MutationRegistrar contains information needed
// to register a type of Operation Spec
// that will be converted into a SchemaMutator
// and embedded in a SchemaMutationProcedureSpec.
// Operations with a corresponding MutationRegistrar
// should not have their own ProcedureSpec.
type MutationRegistrar struct {
Kind flux.OperationKind
Type semantic.MonoType
Create flux.CreateOperationSpec
}
func (m MutationRegistrar) Register() {
t := runtime.MustLookupBuiltinType("universe", string(m.Kind))
runtime.RegisterPackageValue("universe", string(m.Kind), flux.MustValue(flux.FunctionValue(string(m.Kind), m.Create, t)))
// Add to list of SchemaMutations which should map to a
// SchemaMutationProcedureSpec
SchemaMutationOps = append(SchemaMutationOps, m.Kind)
}
// A list of all MutationRegistrars to register.
// To register a new mutation, add an entry to this list.
var Registrars = []MutationRegistrar{
{
Kind: RenameKind,
Type: runtime.MustLookupBuiltinType("universe", "rename"),
Create: createRenameOpSpec,
},
{
Kind: DropKind,
Type: runtime.MustLookupBuiltinType("universe", "drop"),
Create: createDropOpSpec,
},
{
Kind: KeepKind,
Type: runtime.MustLookupBuiltinType("universe", "keep"),
Create: createKeepOpSpec,
},
{
Kind: DuplicateKind,
Type: runtime.MustLookupBuiltinType("universe", "duplicate"),
Create: createDuplicateOpSpec,
},
}
func init() {
for _, r := range Registrars {
r.Register()
}
plan.RegisterProcedureSpec(SchemaMutationKind, newSchemaMutationProcedure, SchemaMutationOps...)
execute.RegisterTransformation(SchemaMutationKind, createSchemaMutationTransformation)
}
func createRenameOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
var cols values.Object
if c, ok, err := args.GetObject("columns"); err != nil {
return nil, err
} else if ok {
cols = c
}
var renameFn interpreter.ResolvedFunction
if f, ok, err := args.GetFunction("fn"); err != nil {
return nil, err
} else if ok {
if fn, err := interpreter.ResolveFunction(f); err != nil {
return nil, err
} else {
renameFn = fn
}
}
if cols == nil && renameFn.Fn == nil {
return nil, errors.New(codes.Invalid, "rename error: neither column list nor map function provided")
}
if cols != nil && renameFn.Fn != nil {
return nil, errors.New(codes.Invalid, "rename error: both column list and map function provided")
}
spec := &RenameOpSpec{
Fn: renameFn,
}
if cols != nil {
var err error
renameCols := make(map[string]string, cols.Len())
// Check types of object values manually
cols.Range(func(name string, v values.Value) {
if err != nil {
return
}
if v.Type().Nature() != semantic.String {
err = errors.Newf(codes.Invalid, "rename error: columns object contains non-string value of type %s", v.Type())
return
}
renameCols[name] = v.Str()
})
if err != nil {
return nil, err
}
spec.Columns = renameCols
}
return spec, nil
}
func createDropOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
var cols values.Array
if c, ok, err := args.GetArray("columns", semantic.String); err != nil {
return nil, err
} else if ok {
cols = c
}
var dropPredicate interpreter.ResolvedFunction
if f, ok, err := args.GetFunction("fn"); err != nil {
return nil, err
} else if ok {
fn, err := interpreter.ResolveFunction(f)
if err != nil {
return nil, err
}
dropPredicate = fn
}
if cols == nil && dropPredicate.Fn == nil {
return nil, errors.New(codes.Invalid, "drop error: neither column list nor predicate function provided")
}
if cols != nil && dropPredicate.Fn != nil {
return nil, errors.New(codes.Invalid, "drop error: both column list and predicate provided")
}
var dropCols []string
var err error
if cols != nil {
dropCols, err = interpreter.ToStringArray(cols)
if err != nil {
return nil, err
}
}
return &DropOpSpec{
Columns: dropCols,
Predicate: dropPredicate,
}, nil
}
func createKeepOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
var cols values.Array
if c, ok, err := args.GetArray("columns", semantic.String); err != nil {
return nil, err
} else if ok {
cols = c
}
var keepPredicate interpreter.ResolvedFunction
if f, ok, err := args.GetFunction("fn"); err != nil {
return nil, err
} else if ok {
fn, err := interpreter.ResolveFunction(f)
if err != nil {
return nil, err
}
keepPredicate = fn
}
if cols == nil && keepPredicate.Fn == nil {
return nil, errors.New(codes.Invalid, "keep error: neither column list nor predicate function provided")
}
if cols != nil && keepPredicate.Fn != nil {
return nil, errors.New(codes.Invalid, "keep error: both column list and predicate provided")
}
var keepCols []string
var err error
if cols != nil {
keepCols, err = interpreter.ToStringArray(cols)
if err != nil {
return nil, err
}
}
return &KeepOpSpec{
Columns: keepCols,
Predicate: keepPredicate,
}, nil
}
func createDuplicateOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
col, err := args.GetRequiredString("column")
if err != nil {
return nil, err
}
newName, err := args.GetRequiredString("as")
if err != nil {
return nil, err
}
return &DuplicateOpSpec{
Column: col,
As: newName,
}, nil
}
func (s *RenameOpSpec) Kind() flux.OperationKind {
return RenameKind
}
func (s *DropOpSpec) Kind() flux.OperationKind {
return DropKind
}
func (s *KeepOpSpec) Kind() flux.OperationKind {
return KeepKind
}
func (s *DuplicateOpSpec) Kind() flux.OperationKind {
return DuplicateKind
}
func (s *RenameOpSpec) Copy() SchemaMutation {
newCols := make(map[string]string, len(s.Columns))
for k, v := range s.Columns {
newCols[k] = v
}
return &RenameOpSpec{
Columns: newCols,
Fn: s.Fn.Copy(),
}
}
func (s *DropOpSpec) Copy() SchemaMutation {
newCols := make([]string, len(s.Columns))
copy(newCols, s.Columns)
return &DropOpSpec{
Columns: newCols,
Predicate: s.Predicate.Copy(),
}
}
func (s *KeepOpSpec) Copy() SchemaMutation {
newCols := make([]string, len(s.Columns))
copy(newCols, s.Columns)
return &KeepOpSpec{
Columns: newCols,
Predicate: s.Predicate.Copy(),
}
}
func (s *DuplicateOpSpec) Copy() SchemaMutation {
return &DuplicateOpSpec{
Column: s.Column,
As: s.As,
}
}
func (s *RenameOpSpec) Mutator(ctx context.Context) (SchemaMutator, error) {
m, err := NewRenameMutator(ctx, s)
if err != nil {
return nil, err
}
return m, nil
}
func (s *DropOpSpec) Mutator(ctx context.Context) (SchemaMutator, error) {
m, err := NewDropMutator(ctx, s)
if err != nil {
return nil, err
}
return m, nil
}
func (s *KeepOpSpec) Mutator(ctx context.Context) (SchemaMutator, error) {
m, err := NewKeepMutator(ctx, s)
if err != nil {
return nil, err
}
return m, nil
}
func (s *DuplicateOpSpec) Mutator(ctx context.Context) (SchemaMutator, error) {
m, err := NewDuplicateMutator(s)
if err != nil {
return nil, err
}
return m, nil
}
type SchemaMutationProcedureSpec struct {
plan.DefaultCost
Mutations []SchemaMutation
}
func (s *SchemaMutationProcedureSpec) Kind() plan.ProcedureKind {
return SchemaMutationKind
}
func (s *SchemaMutationProcedureSpec) Copy() plan.ProcedureSpec {
newMutations := make([]SchemaMutation, len(s.Mutations))
for i, m := range s.Mutations {
newMutations[i] = m.Copy()
}
return &SchemaMutationProcedureSpec{
Mutations: newMutations,
}
}
func newSchemaMutationProcedure(qs flux.OperationSpec, pa plan.Administration) (plan.ProcedureSpec, error) {
s, ok := qs.(SchemaMutation)
if !ok {
return nil, errors.Newf(codes.Internal, "invalid spec type %T doesn't implement SchemaMutation", qs)
}
return &SchemaMutationProcedureSpec{
Mutations: []SchemaMutation{s},
}, nil
}
type schemaMutationTransformation struct {
execute.ExecutionNode
d execute.Dataset
cache table.BuilderCache
ctx context.Context
mutators []SchemaMutator
}
func createSchemaMutationTransformation(id execute.DatasetID, mode execute.AccumulationMode, spec plan.ProcedureSpec, a execute.Administration) (execute.Transformation, execute.Dataset, error) {
s, ok := spec.(*SchemaMutationProcedureSpec)
if !ok {
return nil, nil, errors.Newf(codes.Internal, "invalid spec type %T", spec)
}
return NewSchemaMutationTransformation(a.Context(), s, id, a.Allocator())
}
func NewSchemaMutationTransformation(ctx context.Context, spec *SchemaMutationProcedureSpec, id execute.DatasetID, mem memory.Allocator) (execute.Transformation, execute.Dataset, error) {
mutators := make([]SchemaMutator, len(spec.Mutations))
for i, mutation := range spec.Mutations {
m, err := mutation.Mutator(ctx)
if err != nil {
return nil, nil, err
}
mutators[i] = m
}
t := &schemaMutationTransformation{
cache: table.BuilderCache{
New: func(key flux.GroupKey) table.Builder {
return table.NewBufferedBuilder(key, mem)
},
},
mutators: mutators,
ctx: ctx,
}
t.d = dataset.New(id, &t.cache)
return t, t.d, nil
}
func (t *schemaMutationTransformation) Process(id execute.DatasetID, tbl flux.Table) error {
ctx := NewBuilderContext(tbl)
for _, m := range t.mutators {
if err := m.Mutate(t.ctx, ctx); err != nil {
return err
}
}
mutTable, err := t.mutateTable(tbl, ctx)
if err != nil {
tbl.Done()
return err
}
builder, _ := table.GetBufferedBuilder(mutTable.Key(), &t.cache)
return builder.AppendTable(mutTable)
}
func (t *schemaMutationTransformation) mutateTable(in flux.Table, ctx *BuilderContext) (flux.Table, error) {
// Check the schema for columns with the same name.
cols := ctx.Cols()
for i, c := range cols {
for j := range cols[:i] {
if cols[j].Label == c.Label {
return nil, errors.Newf(codes.FailedPrecondition, "column %d and %d have the same name (%q) which is not allowed", j, i, c.Label)
}
}
}
return &mutateTable{
in: in,
ctx: ctx,
}, nil
}
func (t *schemaMutationTransformation) RetractTable(id execute.DatasetID, key flux.GroupKey) error {
return t.d.RetractTable(key)
}
func (t *schemaMutationTransformation) UpdateWatermark(id execute.DatasetID, mark execute.Time) error {
return t.d.UpdateWatermark(mark)
}
func (t *schemaMutationTransformation) UpdateProcessingTime(id execute.DatasetID, pt execute.Time) error {
return t.d.UpdateProcessingTime(pt)
}
func (t *schemaMutationTransformation) Finish(id execute.DatasetID, err error) {
t.d.Finish(err)
}
type mutateTable struct {
in flux.Table
ctx *BuilderContext
}
func (m *mutateTable) Key() flux.GroupKey { return m.ctx.Key() }
func (m *mutateTable) Cols() []flux.ColMeta { return m.ctx.Cols() }
func (m *mutateTable) Empty() bool { return m.in.Empty() }
func (m *mutateTable) Done() { m.in.Done() }
func (m *mutateTable) Do(f func(flux.ColReader) error) error {
return m.in.Do(func(cr flux.ColReader) error {
indices := m.ctx.ColMap()
buffer := &arrow.TableBuffer{
GroupKey: m.ctx.Key(),
Columns: m.ctx.Cols(),
Values: make([]array.Array, len(indices)),
}
for j, idx := range indices {
// This buffer doesn't live longer than the current scope
// so we don't need to retain anything.
buffer.Values[j] = table.Values(cr, idx)
}
return f(buffer)
})
}