mosche opened a new pull request, #25762:
URL: https://github.com/apache/beam/pull/25762
Beam runners may choose to apply optimizations to a pipeline before it is
executed. A key optimization, fusion, relates to ParDo operations. If one ParDo
operation produces a PCollection that is then consumed as the main input of
another ParDo operation, the two ParDo operations will be fused together into a
single ParDo operation and run in a single pass; this is "producer-consumer
fusion".
This PR implements producer-consumer fusion for sequential ParDos in the
Spark Dataset runner.
Closes #25761
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