Ecto.Adapters.DynamoDB.Query.parse_recursive_option

You're seeing just the function parse_recursive_option, go back to Ecto.Adapters.DynamoDB.Query module for more information.
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parse_recursive_option(scan_or_query, opts)

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Formats the recursive option according to whether the query is a DynamoDB scan or query. (The adapter defaults to recursive fetch in case of the latter but not the former)