You are querying a BigQuery table that has been partitioned by time. You create a query and use the --dry_run flag with the bq query command. The amount of data scanned is far more than you expected. What is a possible cause of this?

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You are querying a BigQuery table that has been partitioned by time. You create a query and use the --dry_run flag with the bq query command. The amount of data scanned is far more than you expected. What is a possible cause of this?