Setting the column_name extension allows users to reference
bigquery column independently of the field name in the protocol buffer
message.
The intended use of this annotation is to reference a destination column
named using characters unavailable for protobuf field names (e.g. unicode
characters).
More details about BigQuery naming limitations can be found here:
https://cloud.google.com/bigquery/docs/schemas#column_names
This extension is currently experimental.
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