Consider making NullableCoder as a StandardCoder
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beam-model
core
improvement
java
P3
python
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- Java
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Description
Having NullableCoder as a StandardCoder helps cross-language pipeline handle null-key KafkaRecord. See discussion: https://lists.apache.org/thread.html/r1740cb29e46644a08b2d1755900dd6dcd5c62b937da1a01148edfcb9%40%3Cdev.beam.apache.org%3E
Imported from Jira [BEAM-12585](https://issues.apache.org/jira/browse/BEAM-12585). Original Jira may contain additional context.
Reported by: boyuanz.
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