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join.go
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join.go
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package join
import (
"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"
)
const Join2Kind = "join.tables"
func init() {
signature := runtime.MustLookupBuiltinType("join", "tables")
runtime.RegisterPackageValue(
"join", "tables", flux.MustValue(flux.FunctionValue("tables", createJoinOpSpec, signature)),
)
plan.RegisterProcedureSpec(Join2Kind, newJoinProcedure, Join2Kind)
execute.RegisterTransformation(Join2Kind, createJoinTransformation)
}
type JoinOpSpec struct {
on interpreter.ResolvedFunction
as interpreter.ResolvedFunction
left *flux.TableObject
right *flux.TableObject
method string
}
func (o *JoinOpSpec) Kind() flux.OperationKind {
return flux.OperationKind(Join2Kind)
}
func createJoinOpSpec(args flux.Arguments, p *flux.Administration) (flux.OperationSpec, error) {
l, ok := args.Get("left")
if !ok {
return nil, errors.New(codes.Invalid, "missing required argument 'left'")
}
left, ok := l.(*flux.TableObject)
if !ok {
return nil, errors.New(codes.Invalid, "argument 'left' must be a table stream")
}
p.AddParent(left)
r, ok := args.Get("right")
if !ok {
return nil, errors.New(codes.Invalid, "missing required argument 'right'")
}
right, ok := r.(*flux.TableObject)
if !ok {
return nil, errors.New(codes.Invalid, "argument 'right' must be a table stream")
}
p.AddParent(right)
o, err := args.GetRequiredFunction("on")
if err != nil {
return nil, err
}
on, err := interpreter.ResolveFunction(o)
if err != nil {
return nil, err
}
a, err := args.GetRequiredFunction("as")
if err != nil {
return nil, err
}
as, err := interpreter.ResolveFunction(a)
if err != nil {
return nil, err
}
method, err := args.GetRequiredString("method")
if err != nil {
return nil, err
}
if method != "inner" && method != "left" && method != "right" && method != "full" {
return nil, errors.New(
codes.Invalid,
"invalid argument for 'method' - must be \"inner\", \"left\", \"right\", or \"full\"",
)
}
op := JoinOpSpec{
left: left,
right: right,
on: on,
as: as,
method: method,
}
return &op, nil
}
type JoinProcedureSpec struct {
On interpreter.ResolvedFunction
As interpreter.ResolvedFunction
Left *flux.TableObject
Right *flux.TableObject
Method string
}
func (p *JoinProcedureSpec) Kind() plan.ProcedureKind {
return plan.ProcedureKind(Join2Kind)
}
func (p *JoinProcedureSpec) Copy() plan.ProcedureSpec {
return &JoinProcedureSpec{
On: p.On,
As: p.As,
Left: p.Left,
Right: p.Right,
Method: p.Method,
}
}
func newJoinProcedure(spec flux.OperationSpec, p plan.Administration) (plan.ProcedureSpec, error) {
s, ok := spec.(*JoinOpSpec)
if !ok {
return nil, errors.New(codes.Internal, "invalid op spec for join procedure")
}
proc := JoinProcedureSpec{
On: s.on,
As: s.as,
Left: s.left,
Right: s.right,
Method: s.method,
}
return &proc, nil
}
func createJoinTransformation(
id execute.DatasetID,
mode execute.AccumulationMode,
spec plan.ProcedureSpec,
a execute.Administration,
) (execute.Transformation, execute.Dataset, error) {
t, err := NewMergeJoinTransformation(
a.Context(),
id,
spec,
a.Parents()[0],
a.Parents()[1],
a.Allocator(),
)
if err != nil {
return nil, nil, err
}
tr := execute.NewTransformationFromTransport(t)
return tr, t.d, nil
}