pskevin commented on a change in pull request #12445:
URL: https://github.com/apache/beam/pull/12445#discussion_r465934906



##########
File path: sdks/go/pkg/beam/external.go
##########
@@ -16,10 +16,144 @@
 package beam
 
 import (
+       "context"
+       "fmt"
+
        "github.com/apache/beam/sdks/go/pkg/beam/core/graph"
+       "github.com/apache/beam/sdks/go/pkg/beam/core/runtime/graphx"
        "github.com/apache/beam/sdks/go/pkg/beam/internal/errors"
+       jobpb "github.com/apache/beam/sdks/go/pkg/beam/model/jobmanagement_v1"
+       pipepb "github.com/apache/beam/sdks/go/pkg/beam/model/pipeline_v1"
+       "google.golang.org/grpc"
 )
 
+// ExternalTransform represents the cross-language transform in and out of the 
Pipeline as a MultiEdge and Expanded proto respectively
+type ExternalTransform struct {
+       id                int
+       Urn               string
+       Payload           []byte
+       In                []PCollection
+       Out               []FullType
+       Bounded           bool
+       ExpansionAddr     string
+       Components        *pipepb.Components
+       ExpandedTransform *pipepb.PTransform
+       Requirements      []string

Review comment:
       Awesome suggestion. Will work on it.




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