davidzollo commented on issue #10942:
URL: https://github.com/apache/seatunnel/issues/10942#issuecomment-4534326415
Here is a reference
```
public class SeaTunnelTransformCollector implements Collector<Record<?>> {
private final List<OneInputFlowLifeCycle<Record<?>>> outputs;
// Cached at construction; outputs list is fixed for the lifetime of
this collector.
private final boolean fanOut;
public
SeaTunnelTransformCollector(List<OneInputFlowLifeCycle<Record<?>>> outputs) {
this.outputs = outputs;
this.fanOut = outputs.size() > 1;
}
@Override
public void collect(Record<?> record) {
if (!fanOut) {
// Fast path: single downstream, no copy, no loop overhead.
if (!outputs.isEmpty()) {
try {
outputs.get(0).received(record);
} catch (IOException e) {
throw new TaskRuntimeException(e);
}
}
return;
}
// Fan-out path: each branch gets its own row copy to prevent
cross-branch mutation.
for (OneInputFlowLifeCycle<Record<?>> output : outputs) {
try {
output.received(copyRecord(record));
} catch (IOException e) {
throw new TaskRuntimeException(e);
}
}
}
private static Record<?> copyRecord(Record<?> record) {
Object data = record.getData();
if (data instanceof SeaTunnelRow) {
return new Record<>(((SeaTunnelRow) data).copy());
}
// Barrier and SchemaChangeEvent are immutable coordination objects;
no copy needed.
return record;
}
@Override
public void close() {}
}
```
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