Ecto.Adapters.DynamoDB.Cache.describe_table

You're seeing just the function describe_table, go back to Ecto.Adapters.DynamoDB.Cache module for more information.
Link to this function

describe_table(repo, table_name)

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Specs

describe_table(Ecto.Repo.t(), table_name_t()) ::
  {:ok, dynamo_response_t()} | {:error, term()}