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Google BigQuery – querying repeated fields

2020-10-25

Google BigQuery is probably one of the best data warehouses in the market nowadays. It dominated Big Data landscape with its infinite scaling capabilities (querying over petabytes of data), ANSI SQL support and ease of use. It has proven its worth in many use cases.

One of the least used and least appreciated features, in my opinion, is repeated fields. The name doesn’t indicate well enough the intention, so for a sake of simplicity please consider it as an array field or nested field. You can define any structure inside the repeated field you like, leveraging types of columns which regular columns can be. The important part is to set mode REPEATED for the field of type RECORD.

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