Multiple NeedsRunner tests break with Flink 'Cannot union streams of different types'
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flink
P3
runners
sub-task
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- Java
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Description
This happens in AvroIOTest for reference.This also breaks most of the Schema related tests, for reference SelectTest.
Imported from Jira [BEAM-7319](https://issues.apache.org/jira/browse/BEAM-7319). Original Jira may contain additional context.
Reported by: iemejia.
Subtask of issue #19427
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