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bigquery/storage/managedwriter/adapt: support packed annotation #6302

@shollyman

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@shollyman

@shollyman Could you support packed = true annotation in repeated FieldOption? We use StorageSchemaToProto2Descriptor and observed 3 bytes overhead per element on repeated fields in the encoded rows. This would be huge overhead to AppendRows throughput for large arrays.

Originally posted by @tyang020 in #4375 (comment)

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api: bigqueryIssues related to the BigQuery API.priority: p2Moderately-important priority. Fix may not be included in next release.type: feature request‘Nice-to-have’ improvement, new feature or different behavior or design.

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