KevinGG opened a new pull request #14073: URL: https://github.com/apache/beam/pull/14073
1. Added deepcopy copier implementation to Pipeline, AppliedPTransform,
PCollection and PTransform classes in Python SDK.
2. Added a copy_pipeline util to switch between runner-api-roundtrip and
new deepcopy implementation based on whether the pipeline contains an
ExternalTransform. We'll gradually move away from the roundtrip
solution once the deepcopy solution is stable.
3. Encapsulated the derivation tracking inside the copy_pipeline util.
4. Early adopted the copy_pipeline util in pipeline_fragment and
pipeline_instrument. Further changes are still needed to support
ExternalTransforms with InteractiveRunner.
------------------------
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