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        :param output_path: the output path.
        :param output_table: the output table name.
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        :param history_table: the source table alias name (a.k.a. history table name) that features belong to
            (e.g. inpatient, or outpatient).
        :param features: the output features.
        :param variables: the input variables.
        :param prevalence: the prevalence dictionary of values for all the variables.
        :return: the output features.
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        :param variable: the input variable.
        :param variable_type: the type of input variable.
        :param postfixes: name of the aggregation functions.
        :param prevalence: the prevalence dictionary of values for all the variables.
        :return: the aggregated variable.
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        :param variable: the input variable.
        :param variable_name: the name of the input variable.
        :return: the prevalence of values for all the variables.
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