Abacn commented on code in PR #27868:
URL: https://github.com/apache/beam/pull/27868#discussion_r1298552659
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sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/MapElements.java:
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@@ -159,6 +159,13 @@ public void processElement(
/** A DoFn implementation that handles a trivial map call. */
private abstract class MapDoFn extends DoFn<InputT, OutputT> {
+
+ /**
+ * Holds {@link MapDoFn#outer} instance of enclosing class, used by {@link
+ * java.lang.reflect.Field} in {@code
SparkNativePipelineVisitor$NativeTransform}.
Review Comment:
No need to refer to `{@code SparkNativePipelineVisitor$NativeTransform}`
here. The comment here could be more general as java core does not depend on
specific runner implementation ~(and this would give a warning of reference not
found when run javadoc)~. Can just say - used by runner implementations.
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