Support transcoding for Flatten in Spark Runner
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new feature
P3
runners
spark
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- Java
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Description
The Beam documentation mentions that Flatten does not require coders of all inputs to be of the same type, as long as the result type is the same. However, the current implementation in the Spark Runner requires all coders to match.
Imported from Jira [BEAM-7236](https://issues.apache.org/jira/browse/BEAM-7236). Original Jira may contain additional context.
Reported by: ibzib.
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