shunping commented on code in PR #34566:
URL: https://github.com/apache/beam/pull/34566#discussion_r2031793582
##########
sdks/go/pkg/beam/runners/prism/internal/preprocess.go:
##########
@@ -106,7 +106,21 @@ func (p *preprocessor) preProcessGraph(comps
*pipepb.Components, j *jobservices.
// If there's an unknown urn, and it's not composite,
simply add it to the leaves.
if len(t.GetSubtransforms()) == 0 {
- leaves[tid] = struct{}{}
+ shouldAdd := true
+
+ // However, if it is an empty transform with
identical input/output pcollections,
+ // it will be discarded.
+ if len(t.GetInputs()) == 1 &&
len(t.GetOutputs()) == 1 {
+ inputID := getOnlyValue(t.GetInputs())
+ outputID := getOnlyValue(t.GetOutputs())
+ if inputID == outputID {
+ shouldAdd = false
Review Comment:
Fixed.
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