Charles Chen created BEAM-3511:
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Summary: Eager running of overridden transforms in Python SDK does
not work
Key: BEAM-3511
URL: https://issues.apache.org/jira/browse/BEAM-3511
Project: Beam
Issue Type: Bug
Components: sdk-py-core
Reporter: Charles Chen
Assignee: Charles Chen
Currently, the Python SDK supports the pattern: "['my', 'list'] |
MyPTransform()", which will return the results of running MyPTransform on the
given list in an "eager evaluation" of the generated pipeline. For Python Beam
runners, we also support the use of PTransformOverrides to allow runners to
override the behavior of specific transforms. If this is used to override a
transform that is used in eager evaluation, the evaluation will fail, as the
eager evaluator looks for the result of the original applied transform, which
will have been overridden away.
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