jeffreyoldham opened a new issue, #22766:
URL: https://github.com/apache/beam/issues/22766
blob/master/sdks/go/pkg/beam/core/runtime/exec/translate.go:531 contains a
double type assertion but only the latter is checked for correctness. If the
former fails, the pipeline incorrectly panics. The revised code should be:
```go
if pc, ok := ma.Out.(*PCollection); ok {
if eo, ok :=
pc.Out.(*ExtractOutput); ok {
// Strip PCollections
from between MergeAccumulators and ExtractOutputs
// as it's a synthetic
PCollection.
b.units =
b.units[:len(b.units)-1]
ma.Out = eo
}
}
```
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