michalmisiewicz commented on issue #33842:
URL: https://github.com/apache/beam/issues/33842#issuecomment-2631881919
For additional context, we’re writing to a dynamically selected BigQuery
table:
```java
BigQueryIO.<TableRowWrapper>write()
.to(input -> createTableSpec(input, project,
topicTableMapping))
```
The issue may stem from this line, where `unknownFields` are assigned to an
empty TableRow and passed to a function which converts TableRow to Proto
Message.
https://github.com/apache/beam/blob/c7b2695f36412d43e779ce8f8276127dcb0a3885/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/StorageApiDynamicDestinationsTableRow.java#L181-L192
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