fn group_v3_reports_by_sink(
reports: Vec<PbIcebergV3SinkMetadata>,
) -> MetaResult<HashMap<SinkId, (u64, Vec<PbIcebergV3SinkMetadata>)>>fn group_v3_reports_by_sink(
reports: Vec<PbIcebergV3SinkMetadata>,
) -> MetaResult<HashMap<SinkId, (u64, Vec<PbIcebergV3SinkMetadata>)>>