Support unknown fields in Rows
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gcp
io
java
P3
sub-task
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- Java
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Description
As input data often evolves unexpectedly, Row needs a way of handling unknown input fields.
Imported from Jira [BEAM-4458](https://issues.apache.org/jira/browse/BEAM-4458). Original Jira may contain additional context.
Reported by: reuvenlax.
Subtask of issue #18898
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